AT Command Sets for Modems with ESS Chipsets

NOTE: This is a generic AT command set for for all ESS modems. Not all of these commands may work for your modem.

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Characters within the command line are parsed as commands with associated parameter values. The basic commands consist of single ASCII characters, or single characters preceded by a prefix character (e. g., "&"), followed by a decimal parameter. Missing decimal parameters are evaluated as 0.

The modem supports the editing of command lines by recognizing a backspace character. When modem echo is enabled, the modem responds to receipt of a backspace or delete by echoing a backspace character, a space character, and another backspace. This editing is not applicable to the AT header of a command.

The AT sequence may be followed by any number of commands in sequence, except for commands such as Z, D, or A. Commands following commands Z, D, or A on the same command line are ignored. The maximum number of characters on any command line is 39 (including "A" and "T"). If a syntax error is found anywhere in a command line command, the remainder of the line is ignored and the ERROR result code is returned.
Most commands entered with parameters out of range are not accepted and the ERROR response is returned to the DTE.

Commands are only accepted by the modem once the previous command has been fully executed, which is normally indicated by the return of an appropriate result code. Execution of commands D and A, either as a result of a direct command or a re-execute command are aborted if another character is entered before completion of the handshake.
Time Independent Escape Sequence ESS can support either the Time Independent Escape Sequence (TIES) or the Hayes escape sequence formats. However, since Hayes requires a valid license, ESS Technology, Inc., accepts no responsibility for, nor indemnifies against, nor in any way provides any type of protection against infringements of or violations of patents by its customers or any users of ESS Technology products.

The TIES (default) format is an in-band escape sequence that allows the modem to escape from the data mode to the command mode. The escape command is identical to that used by Hayes. The escape character is normally a "+" (default); however, it can be changed using the S2 register.

Only the following AT commands are supported in the TIES command mode:

Basic AT Commands The modem responds to the commands detailed in this section. Parameters applicable to
each command are listed with the command description.

A
Answer
The modem goes off-hook and attempts to answer an incoming call if the correct conditions are met. Upon successful completion of answer handshake, the modem goes online in answer mode. If +FCLASS= 0 is selected, the modem enters the connect state after exchanging a carrier with the remote modem. If no carrier is detected within a period specified in register S7, the modem hangs up. Any character entered during the connect sequence aborts the connection attempt.

If +FCLASS= 1 or 2 is selected, the modem goes off-hook in V. 21 answer mode. It generates the V. 21 2100 Hz answer tone for 3 ± 0.5 seconds and, following a delay of 70ms, proceeds as if the +FTH= 3 command were issued. At any stage up to (but excluding) the +FTH= 3 command state, any character aborts the communication. See the description of command +FTH 8 and 9 for details.

En Hn Mn On Qn Vn
Xn &Dn &Kn &Wn &V 7

A/
Repeat Command
The modem executes the last command line sent by the DTE. "A/" repeats all the commands in the command buffer.

The principal application of this command is to place another call (using the Dial command) that failed to connect due to a busy line, no answer, or a wrong number. This command must appear alone on a command line. This command should not be terminated by a carriage return.

ATSn= x
Write to Selected S-Register
This command writes the value x to the currently selected S-register. An S-register can be selected by using the ATSn command. All of the S-registers return the OK response if x is a number.
Result Codes:
OK For all arguments

ATSn?
Read Selected S-Register
This command reads and displays the contents of the selected S-register. An S-register can be selected by using the ATSn command.

Result Codes:
OK For all arguments

Bn CCITT or Bell
When the modem is configured to allow either option, the modem selects Bell or CCITT modulation for a line speed connection of 300 or 1200 bit/ s according to the parameter
supplied. Any other line speed uses a CCITT modulation standard.
B0 Selects CCITT operation at 300 or 1200 bit/ s (default).

Result Codes:
OK n = 0
ERROR Otherwise 8

Cn
Carrier Control (dummy command)
This command is included for compatibility only, and has no effect other than returning a result code. The only valid parameter is 1.
Result Codes:
OK n= 1
ERROR Otherwise

Dn
Dial
This command directs the modem to go online, dial according to the string entered and attempt to establish a connection. If no dial string is supplied, the modem goes online and attempts the handshake in originate mode. If the ATD command is issued before the S1 register has cleared, the modem responds with the NO CARRIER result code.

If +FCLASS= 0 is selected, the modem behaves as a data modem and attempts to connect to another data modem. The modem has up to the period of time specified by register S6 or S7 to wait for carrier and complete the handshake. If this time expires before the modem can complete the handshake, the modem goes on-hook with the NO CARRIER response. This command is aborted in progress upon receipt of any DTE character before completion of the handshake.

If +FCLASS= 1 or 2 is selected, the modem behaves as a facsimile modem and attempts to connect to a facsimile machine (or modem) by entering the HDLC V. 21 channel 2 receive state (as if +FRH= 3 had been issued). This command is aborted upon receipt of any DTE character if the modem has not finished dialing. In this case, the modem goes on-hook and returns to command mode after displaying the NO CARRIER message. If the modem has finished dialing, it proceeds as if the +FRH= 3 command has been issued. (Refer to the +FRH command to determine how the modem behaves following this stage.)
Dial Modifiers
The valid dial string parameters are described below. Punctuation characters may be used for clarity, with parentheses, hyphens, and spaces being ignored. The maximum dial string ngth is 50 characters.

0-9 DTMF digits 0 to 9
! Flash: the modem goes on-hook for a time defined by the value of S29 (not used)
@ Not supported
# The 'gate' digit (tone dialing only)
* The 'star' digit (tone dialing only)
a-d DTMF digits a, b, c, and d. Some countries may prohibit sending these digits during dialing.
L Redial last number: the modem redials the last valid telephone number. The L must be immediately after the D with all the following characters ignored.
P Select pulse dialing: pulse dial the numbers that follow until a "T" is encountered. Affects current and subsequent dialing.
Sn Dials the stored phone number associated with the &Zn command.
T Select tone dialing: tone dial the numbers that follow until a "P" is encountered. Affects current and subsequent dialing.
W Wait for dial tone: the modem waits for dial tone before dialing the digits following "W". If dial tone is not detected within the time specified by S7, the modem aborts the rest of the sequence, returns on-hook, and generates an error message.
, Dial pause: the modem pauses for a time specified by S8 before dialing the digits following ",".
; Return to command state. Added to the end of a dial string, this causes the modem to return to the command state after it processes the portion of the dial string preceding
the ";". This allows the user to issue additional AT commands while remaining off-hook. The additional AT commands may be placed in the original command line following the
";" and/ or may be entered on subsequent command lines. The modem enters call progress only after an additional dial command is issued without the ";" terminator. Use
"L' to abort the dial in progress, and go back on-hook.
( ) Ignored: may be used to format the dial string
. Ignored: may be used to format the dial string
-Ignored: may be used to format the dial string
<space> Ignored and may be used to format the dial string
<i> Invalid character: is ignored

En
Command Echo
The modem enables or disables the echo of characters to the DTE according to the parameter supplied. The parameter value, if valid, is written to S14 bit 1.

E0 Disables command echo
E1 Enables command echo (DEFAULT)
Result Codes:
OK n= 0 or 1
ERROR Otherwise 10

Hn
Disconnect (Hang-Up)
This command initiates a hang up sequence.
H0 The modem releases the line if the modem is currently online, and terminates any test (AT& T) that is in progress. Country specific, modulation specific, and error correction protocol specific (S38) processing are handled outside of the H0 command.

H1 If on-hook, the modem goes off-hook and enters command mode.
Result Codes:
OK n= 0 or 1

ERROR Otherwise

In
Identification
The modem reports to the DTE the requested result according to the command parameter.
I0 Reports modem speed. For example, 56000/ 33600
I1 Reports chipset. For example, ES2898/ 2818
I2 Reports DSP code major revision. For example, RXF2-V90A
I3 Reports controller code major revision. For example, V3. 43_ V_ PI
I4 Reports manufacturer's name. For example, ESS Technology, Inc.
I5 Reports board name. For example, ES56V-PI
I6 Reports OK
I7 Reports OK
I9 Data// TAM/ handset/ speakerphone
I10 Reports detailed DSP code revision. For example, R903X152. E-x2a. exe 01/ 11/ 98 03: 23pm
I11 Reports detailed controller code revision. For example, V3.43.005K-V-PI
I12 Reports driver time stamp. For example, 15: 28: 27-Jan 13 1999
Result Codes:
OK n = 0 to 12

ERROR Otherwise 11
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Basic AT Commands
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Ln
Speaker Volume
The modem sets the speaker volume control according to the parameter supplied. The parameter value, if valid, is written to S22 bits 0 and 1.

L0 Lowest volume
L1 Low volume (DEFAULT)
L2 Medium volume
L3 High volume
Result Codes:
OK n = 0 to 3
ERROR Otherwise

Mn
Speaker Control
This command selects when the speaker is on or off. The parameter value, if valid, is written to S22 bits 2 and 3.

M0 Speaker is always off.
M1 Speaker is on during call establishment, but off when receiving carrier (default).
M2 Speaker is always on.
M3 Speaker is off when receiving carrier and during dialing, on with dial tone and during
handshaking, and on during answering.

Result Codes:
OK n = 0 to 3

ERROR Otherwise 12
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Basic AT Commands
SAM0055-080101 1-8 AT Command Guide
Nn
Automode Enable
This command enables or disables automode detection. The parameter value, if valid, is written to S31 bit 1.

N0 Automode detection is disabled. A subsequent handshake is conducted according to the contents of S37 or, if S37 is zero, according to the most recently sensed DTE speed.

N1 Automode detection is enabled. A subsequent handshake is conducted according to the automode algorithm supported by the modem (default).

Result Codes:
OK n= 0 or 1
ERROR Otherwise

On
Return to Online Data Mode
This command determines how the modem enters the online data mode. If the modem is in the online command mode, it enters the online data mode with or without a retrain. If the modem is in the off-line command mode (no connection), ERROR is reported.
Result Codes:
O0 Enters online data mode without a retrain. Handling is determined by the Call Establishment task. Generally, if a connection exists, this command connects the DTE
back to the remote modem after an escape (+++).

O1 Enters online data mode with a long retrain before returning to online data mode.
O2 Enters online data mode with a short retrain before returning to online data mode.
Result Codes:
OK n = 0 to 2 and a connection exists

ERROR Otherwise or if not connected

P
Set Pulse Dial
This command forces pulse dialing until the next T dial modifier or T command is received.
As soon as a dial command is executed that explicitly specifies the dialing mode for that particular call (e. g., ATDT...), this command is overridden so that all future dialing is tone dialed. See command T -"Set Tone Dial".
Result Code:
OK
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Basic AT Commands
AT Command Guide 1-9 SAM0055-080101
Qn
Result Codes Control
The command enables or disables the sending of result codes to the DTE according to the parameter supplied. The parameter value, if valid, is written to S14 bit 2.

Q0 Enables result codes to the DTE (default)
Q1 Disables result codes to the DTE
Result Codes:
OK n =0 or 1
ERROR Otherwise

Sn
Read/ Write S-Register
The modem selects an S-register, performs an S-register read or write function, or reports the value of an S-register.

n Establishes S-register n as the last register accessed
n= v Sets S-register n to the value v
n? Reports the value of S-register n
The parameter n can be omitted, in which case the last S-register accessed is assumed. The S can be omitted for AT= and AT? in which case the last S register accessed is assumed.

For example:
ATS7 establishes S7 as the last accessed register.
AT= 40 sets the contents of the last register accessed to 40.
ATS= 20 sets the contents of the last register accessed to 20.
If the number "n" is beyond the range of the S-registers available, the modem returns the ERROR message. If the result is outside the range permitted for a given S-register, the values are still stored, but functionally the lower and higher limits are observed. Input and output are always in decimal format. Note that some S-registers are read-only.

In some cases, writing to the S-register appears to be accepted, but the value is not actually written.
Due to country restrictions, some commands are accepted, but the value may be limited and replaced by a maximum or minimum value.
Result Codes:
OK 0-99

ERROR Otherwise 14
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Basic AT Commands
SAM0055-080101 1-10 AT Command Guide
T
Set Tone Dial
This command forces DTMF dialing until the next P dial modifier or DP command is received. DTMF or tone dialing is the default method of dialing. The modem sets an S register bit to indicate that all subsequent dialing should be conducted in tone mode. Clears S14 bit 5.

Result Code:
OK

Vn
Result Code Form
This command selects the sending of short-form or long-form result codes to the DTE. The parameter, if valid, is written to S14 bit 3.

V0 Enables short-form (terse) result codes. Line feed is not issued before a short-form result code.

V1 Enables long-form (verbose) result codes (default).

Wn
Connection Message Control
This command controls the format of CONNECT messages.
W0 Upon connection, the modem reports only the DTE speed (e. g., CONNECT 115200).
Subsequent responses are disabled.

W1 Upon connection, the modem reports the line (carrier) speed, the error correction protocol, and the DTE speed, respectively. Subsequent responses are disabled.

W2 Upon connection, the modem reports only the DCE speed (e. g., CONNECT 33600). Subsequent responses are disabled (default).

Result Codes:
OK n= 0, 1 or 2
ERROR Otherwise 15

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Basic AT Commands
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Xn
Extended Result Codes
This command selects the subset of the result messages that is used by the modem to inform the DTE of the results of commands.

X0 Disables monitoring of busy tones unless forced otherwise by country requirements; send only OK, CONNECT, RING, NO CARRIER, and, ERROR result codes. If busy tone
detection is enforced and busy tone is detected, NO CARRIER is reported. If dial tone detection is enforced or selected and dial tone is not detected, NO CARRIER is reported
instead of NO DIAL TONE. The value 000b is written to S22 bits 6, 5, and 4, respectively.

X1 Same as X0, plus CONNECT XXXX (XXXX = rate).
X2 Same as X1, plus NO DIAL TONE response. NO DIAL TONE is reported instead of NO CARRIER, if dial tone is not detected.

X3 Enables monitoring of busy tones; send only OK, CONNECT, RING, NO CARRIER, ERROR, NO ANSWER, and CONNECT XXXX. Disables dial tone detection (blind dialing).

X4 Enables monitoring of busy tones; send all messages (default).
Result Codes:
OK n= 0 to 4
ERROR Otherwise

Yn
Long Space Disconnect (not implemented)
This command is included for compatibility only and has no effect other than returning a result code.

Result Codes:
OK n= 0 or 1
ERROR Otherwise

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Extended AT Commands
SAM0055-080101 1-12 AT Command Guide

Zn
Soft Reset and Restore Profile
The modem performs a soft reset and restores (recalls) the configuration profile according to the parameter supplied. If no parameter is specified, zero is assumed.

Z0 Soft reset and restore stored profile 0
Z1 Soft reset and restore stored profile 1
Result Codes:
OK n= 0 or 1
ERROR Otherwise

Extended AT Commands
&Cn
Data Carrier Detect (DCD) Option
The modem controls the RLSD output in accordance with the parameter supplied.
&C0 DCD remains ON at all times (default)

&C1 DCD follows the state of the carrier being received
Result Codes:
OK n= 0 or 1
ERROR Otherwise

&Dn
DTR Option
This command interprets the ON to OFF transition of the DTR signal from the DTE in accordance with the parameter supplied. The parameter value, if valid, is written to S21 bits 3 and 4.
&D0 DTR is always on. (DEFAULT)

&D1 DTR drop causes modem to enter command mode
&D2 DTR drop causes modem to hang up
Result Codes:
OK n= 0 to 2
ERROR Otherwise

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Extended AT Commands
AT Command Guide 1-13 SAM0055-080101

&Fn
Restore Factory Configuration (Profile)
The modem loads the factory default configuration (profile). The factory defaults are identified for each command and in the S register descriptions. A configuration (profile) consists of a subset of S-registers.
&F0 Restore factory configuration 0
&F1 Same as &F0
Result Codes:
OK n= 0 or 1
ERROR If the modem is connected

&Jn
Telephone Jack Control
This command is only included for compatibility and performs no function except to load the S-Register. The parameter value, if valid, is written to S21 bit 0.

&J0 &J0 command.
Result Codes:
OK n= 0
ERROR Otherwise

&Kn
Flow Control
This command defines the DTE/ DCE (terminal/ modem) flow control mechanism.
&K0 Disables flow control
&K3 Enables RTS/ CTS flow control (default for data modem modes)
&K4 Enables XON/ XOFF flow control
&K5 Enables transparent XON/ XOFF flow control
&K6 Enables both RTS/ CTS and XON/ XOFF flow control
Result Codes:
OK n= 0, 3, 4, 5, or 6
ERROR Otherwise

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Extended AT Commands
SAM0055-080101 1-14 AT Command Guide

&Ln
Lease Line Control
This command is included for compatibility only and has no effect other than returning a result code.

Result Codes:
OK n= 0 or 1
ERROR Otherwise

&Mn
Asynchronous/ Synchronous Mode Selection
This command is included for compatibility only, and has no effect other than returning a result code.

Result Codes:
OK n = 0
ERROR Otherwise

&Pn
Select Pulse Dial Make/ Break Ratio
This command determines the make/ break ratio used during pulse dialing. The parameter value, if valid, is written to S28 bits 3 and 4.

&P0 39%-61% make/ break ratio at 10 pulses per second (DEFAULT)
&P1 Selects 33%-67% make/ break ratio at 10 pulses per second
Result Codes:
OK n= 0 to 3
ERROR Otherwise

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Extended AT Commands
AT Command Guide 1-15 SAM0055-080101

&Qn
Sync/ Async Mode
This command is included for compatibility only, and has no other effect than returning a result code. The parameter value, if valid, is written to S27, bits 0, 1 and 3.

Result Codes:
OK n= 0, 5, 6
ERROR Otherwise

&Sn
DSR Control
This command is included for compatibility only, and has no other effect than returning a result code. The parameter value, if valid, is written to S21, bit 6.

Result Codes:
OK n= 0
ERROR Otherwise

&Tn
Test and Diagnostics
The modem performs selected test and diagnostic functions according to the parameter supplied. A test can be run only when in an asynchronous operation in non-error-correction mode (normal or direct mode). To terminate a test in progress, the escape sequence must be entered first. If S18 is non-zero, a test will terminate automatically after the time specified by S18 and display the OK message.
&T0 Terminates test in progress and clears S16.
&T1 Initiates local analog loopback, V. 54 Loop 3. Sets S16 bit 0. If a connection exists when this command is issued, the modem hangs up. The CONNECT XXXX message is
displayed upon the start of the test.
&T2 Returns ERROR
&T3 – 8 These commands are included for compatibility only and have no effect other than returning a result code.

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Extended AT Commands
SAM0055-080101 1-16 AT Command Guide

&V
Display Current Configuration and Stored Profiles
Reports the current (active) configuration, the two stored (user) profiles, and the first four stored telephone numbers.

Result Code:
OK

&Wn
Store Current Configuration
Saves the current (active) configuration (profile), including S registers, in one of the two user profiles in NVRAM as denoted by the parameter value. This command yields an ERROR message if the NVRAM is not installed or is not operational as detected by the NVRAM test.
The current configuration is composed of a list of storable parameters illustrated in the &V command. These settings are restored to the active configuration upon receiving a Zn command or at power up. See the following command "& Yn".
&W0 Store the current configuration as profile 0.
&W1 Store the current configuration as profile 1.
Result Codes:
OK n= 0 or 1
ERROR Otherwise

&Yn
Designate a Default Reset Profile
This command is included for compatibility only, and has no other effect than returning a result code. The parameter value, if valid, is written to S96.

Result Codes:
OK n= 0 to 1
ERROR Otherwise

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Error Control AT Commands
AT Command Guide 1-17 SAM0055-080101

&Zn= x
Store telephone number
The modem can store up to four telephone numbers. Each telephone number dial string can contain up to 38 digits.

&Zn= x n = 0 to 3, and x = dial string.
Result Codes:
OK For n <= 3, and x <= 38 digits.

Error Control AT Commands

%Cn
Enable/ Disable Data Compression
Enables or disables data compression negotiation. The modem can only perform data compression on an error corrected link. The parameter value, if valid, is written to S41 bits 0 and 1.
%C0 Disables data compression and resets S46 bit 1.
%C1 Enables MNP 5 data compression negotiation and resets S46 bit 1.
%C2 Enables V. 42 bis data compression and sets S46 bit 1.
%C3 Enables both V. 42 bis and MNP 5 data compression sets S46 bit 1 (default).
Result Codes:
OK n= 0 to 3
ERROR Otherwise

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Data Compression AT Commands
SAM0055-080101 1-18 AT Command Guide

%En
Enable/ Disable Line Quality Monitor and Auto-Retrain or Fallback
Controls whether or not the modem requests a retrain (% E1) or fall back when line quality is insufficient. Applies to dial-up line only. The parameter value, if valid, is written to S41 bits 2 and 6.
If enabled, the modem attempts to retrain for a maximum of 30 seconds.
%E0 Disable line quality monitor and auto-retrain
%E1 Enable line quality monitor and auto-retrain (default)
Result Codes:
OK n= 0,1.
ERROR Otherwise.

Data Compression AT Commands
\An
Select Maximum MNP Block Size
The modem operates an MNP error corrected link using a maximum block size controlled by the parameter supplied. The parameter value, if valid, is written to S40 bits 6 and 7.

\A0 64 characters (default)
\A1 128 characters
\A2 192 characters
\A3 256 characters

Result Codes:
OK n= 0 to 3
ERROR Otherwise


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Data Compression AT Commands
AT Command Guide 1-19 SAM0055-080101

\Gn
Modem to Modem Flow Control (XON/ XOFF)
In non-error correction mode, the modem enables or disables the generation or recognition of modem-to-modem XON/ XOFF flow control according to the parameter supplied. The parameter value, if valid, is written to S41 bit 3.
In error correction mode, the setting of modem-to-modem XON/ XOFF flow control is ignored. Due to the buffering system used in the modem, modem-to-modem flow control is normally disabled.

\G0 Disables modem-to-modem XON/ XOFF flow control (default)
\G1 Enables modem-to-modem XON/ XOFF flow control
Result Codes:
OK n =0 or 1
ERROR Otherwise

Note: When the modem receives a break from the remote modem, the break is passed to the DTE as follows: in non-error-correction mode direct, the break length is passed; in non-error-correction mode normal and in error-correction mode, a 300 ms break is passed.

\Ln
MNP Block/ Stream Mode Select
At connection time, this command controls the selection between block and stream modes of operation in MNP. The parameter value, if valid, is written to S41 bit 4.

\L0 Use stream mode for MNP connection (default).
\L1 Use interactive block mode for MNP connection. This command accepts block mode, but
implements stream mode.

Result Codes:
OK n= 0 or 1
ERROR Otherwise

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Data Compression AT Commands
SAM0055-080101 1-20 AT Command Guide

\Nn
Operating Mode
This command controls the preferred error correcting mode to be negotiated in a subsequent data connection.

\N0 Selects normal speed buffered mode (disables error-correction mode)
\N1 Selects direct mode
\N2 Selects reliable (error-correction) mode. The modem first attempts an LAPM connection, and then an MNP connection. Failure to make a reliable connection results in the
modem hanging up.
\N3 Selects auto reliable mode. This operates the same as \N2, except failure to make a reliable connection results in the modem falling back to the speed-buffered normal mode (default).
\N4 Selects LAPM error-correction mode. Failure to make an LAPM error-correction connection results in the modem hanging up.
\N5 Selects MNP error-correction mode. Failure to make an MNP error-correction connection results in the modem hanging up.

Result Codes:
OK n= 0 to 5.
ERROR Otherwise.


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AT+ Commands
AT Command Guide 1-21 SAM0055-080101

AT+ Commands

+DR
Data Compression Reporting Parameter:

+DR=< value>
Description
This extended-format numeric parameter controls whether or not the extended-form "+ DR" intermediate result code is transmitted from the DCE to the DTE. The +DR:< type> reported shall represent the current (negotiated or renegotiated) DCE-DCE data compression type. If enabled, the intermediate result code is transmitted at the point after error control negotiation (handshaking) at which the DCE has determined which data compression technique will be used (if any) and the direction of operation. The format of this result is the following table. Implementation of this parameter and the associated intermediate result code is mandatory if data compression is implemented in the DCE.

The _DR intermediate result code, if enabled, is issued after the Error Control Report (+ ER) and before the final result code (e. g., CONNECT).
Table 1-1: V. 44 Data Compression Reporting Intermediate Result Codes
+DR: NONE Data compression is not in use.
+DR: V42B Rec. V. 42 bis is in use in both directions.
+DR: V42B RD Rec. V. 42 bis is in use in receive direction only.
+DR: V42B TD Rec. V. 42 bis is in use in transmit direction only.
+DR: V44 Rec. V. 44 is in use in both directions.
+DR: V44 RD Rec. V. 44 is in use in receive direction only.
+DR: V44 TD Rec. V. 44 is in use in transmit direction only.

Table 1-2: V. 44 Data Compression Reporting Values
<value> Description
0 Data compression reporting disabled (no +DR result code transmitted)
1 Data compression reporting enabled (+ DR result code transmitted)

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AT+ Commands
SAM0055-080101 1-22 AT Command Guide
Recommend default setting:

0
Read syntax
at+ dr?
The DCE shall transmit a line of information text to the DTE, consisting of:
+DR:< current setting>
For example, with the recommended default setting, the DCE could report:
+DR: 0
Test syntax:
at+ dr=?
The DCE transmits a string of information text to the DTE, consisting of:
+DR: (list of supported values)
For example, a DCE that supported all defined settings would report:
+DR: (0, 1)

+DS
V. 42 bis Data Compression
Parameter: +DS=[< direction>,[< compression_ negotiation>,[< max_ dict>,[ <max_ string>]]]]
This extended-format compound parameter controls the V. 42 bis data compression function, if provided in the DCE. It accepts four numeric subparameters:

– <direction>, which specifies the desired direction( s) of operation of the data compression function
from the DTE point of view.

– <compression_ negotiation>, which specifies whether or not the DCE should continue to operate if
the desired result is not obtained

– <max_ dict>, which specifies the maximum number of dictionary entries that should be negotiated
(may be used by the DTE to limit the codeword size transmitted, based on its knowledge of the
nature of the data to be transmitted).

– <max_ string>, which specifies the maximum string length to be negotiated
The implementation of this parameter is mandatory if V. 42 bis data compression is implemented in the DCE.


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AT+ Commands
AT Command Guide 1-23 SAM0055-080101

Default settings:
<direction> 3
<compression_ negotiation> 0
<max_ dict> Determined by the manufacturer
<max_ string> 6
Read syntax:
at+ ds? returns +DS: 3,0,512,6 (accept bidirectional data compression, do not disconnect if
V. 42 bis is not negotiated by the remote DCE, maximum number of entries 512, strings no longer than 6 characters).

Test syntax:
at+ ds=? returns a string of information text to the DTS consisting of, e. g., +DS (0-3), (0-1) ,
(512, 1024, 2048), (6-250).

Table 1-3: V. 42 bis Data Compression Control Subparameters
<direction> Description
0 Negotiated... no compression (V. 42 bis P0= 0
1 Transmit only
2 Receive only
3 Bidirectional, accept any direction (V. 42 bis P0= 11
<compression_ negotiation Description
0 Do not disconnect if Rec. V. 42 bis is not negotiated by the remote DCE as specified in <direction>.
1 Disconnect if Rec. V. 42 bis is not negotiated by the remote DCE as specified in <direction>.
<max_ dict> 512, 1024, 2048
<max_ string> 6 to 250

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AT+ Commands
SAM0055-080101 1-24 AT Command Guide

+DS44
V. 44 Data Compression
Parameter: +DS44=[< direction>,[< compression_ negotiation>,[< capability>,[ max_ codewords_ tx>,[< max_codewords_ rx,[< max_ string_ tx,[< max_ string_ rx,[< max_ history_ tx>,[< max_ history_ rx>]]]]] ]]]]

Description:
This extend-format compound parameter controls the V. 44 data compression function, if provided in the DCE. It accepts nine numeric subparameters. Implementation of this parameter is mandatory if V. 44 data compression is implemented in the DCE

– <direction>, which specifies the desired direction( s) of operation of the data compression function from the DTE point of view
– <compression_ negotiation>, which specifies whether the DCS should continue to operate, if the desired result in not obtained
– <capability>, which specifies the use of stream method, packet method, or multipacket method
– <max_ codewords_ tx>, which specifies the maximum number of codewords to be negotiated in the transmit direction
–<max_ codewords_ rx>, which specifies the maximum number of codewords to be negotiated in the receive direction
– <max_ string_ tx>, which specifies the maximum string length to be negotiated in the transmit direction
– <max_ string_ rx>, which specifies the maximum string length to be negotiated in the receive direction
– <max_ history_ tx>, which specifies the maximum size of the history buffer to be negotiated in the transmit direction
– <max_ history_ rx>, which specifies the maximum size of the history buffer to be negotiated in the receive direction

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AT+ Commands
AT Command Guide 1-25 SAM0055-080101

Defined values:
Recommended default settings:
<direction> 3
<compression_ negotiation 0
<capability> 0
<max_ codewords_ tx> 1024
<max_ codewords_ rx> 1024
<max_ string_ tx> 255
<max_ string_ rx> 255
<max_ history_ tx> 3072
<max_ history_ rx> 3072

Table 1-4: V. 44 Data Compression Control Subparameters
<direction> Description
0 Negotiated... no compression
1 Transmit only
2 Receive only
3 Bidirectional, accept any direction
<compression_ negotiation>
0 Do not disconnect if Rec. V. 44 is not negotiated by the remote DCE as specified in <direction>
1 Disconnect if Rec. V. 44 is not negotiated by the remote DCE as specified in <direction>
<capability>
0 Stream
1 Packet
2 Multipacket
<max_ codewords_ tx> 256 to 65536
<max_ codewords_ rx> 256 to 65536
<max_ string_ tx> 32 to 255
<max_ string_ rx> 32 to 255
<max_ history_ tx> >512
<max_ history_ rx> >512


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AT+ Commands
SAM0055-080101 1-26 AT Command Guide

Read syntax
at+ ds44?
The DCE transmits a string of information text to the DTE, consisting of :
+DS44:< direction>,< compression_ negotiation>,< capability>, max_ codewords_ tx>,<max_ codewords_ rx,< max_ string_ tx,< max_ string_ rx,< max_ history_ tx>,<max_ history_ rx>

Test syntax:
at+ ds44=?
The DCE transmits a string of information text to the DTE, consisting of:
+DS44: list of supported <direction> values, list of supported<compression_ negotiation> values, list of supported <capability> values, list of supported <max_ codewords_ tx> values, list of supported <max_ codewords_ rx values, list of supported <max_ string_ tx values, list of supported <max_ string_ rx values, list of supported <max_ history_ tx> values, list of supported<max_ history_ rx> values

+EB
Break Handling In Error Control Operation
Read Syntax: +EB? Parameter: +EB=[< break_ selection>[,< timed>[,< default_ length>]]]
This extended-format compound parameter is used the manner of operation of V. 42 operation in the DCE if present. It accepts three numeric subparameters:

– <break_ selection>, which specifies the type of break to be signalled to the remote DCE upon detecting a break from the local DTE;
– <timed>, which specifies whether the break signal to be signaled to the remote DCE is timed
– <default_ length>, which specifies the amount of time, in tens of milliseconds, that a break should be signalled to the local DTE when an indication of break is received from the remote DCE without a break length explicitly indicated.

at+ eb? returns +EB: 0, 0, 0 (ignore break to remote DCE, no transmitted signal shall
indicate break signal length, do not deliver break to DTE).

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AT+ Commands
AT Command Guide 1-27 SAM0055-080101

+ER
Error Control Reporting
Read Syntax: +ER? Parameter: +ER=[< value>]
This extended-format compound parameter controls whether or not the extended-format "+ ER:" intermediate result code is transmitted from the DCE to the DTE.

+ER: NONE and +ER: LAPM are supported.
at+ er? returns +ER: 0 (error control reporting disabled)

+ES
Error Control Selection
Read Syntax: +ES? Parameter: +ES=[< orig_ rqst>[,< orig_ fbk>[,< ans_ fbk>]]]
This extended-format compound parameter is used the manner of operation of the V. 42 protocol in the DCE if present. It accepts three numeric subparameters:

– <orig_ rqst>, which specifies the initial requested mode of operation when the DCE is operating as the originator;
– <orig_ fbk>, which specifies the acceptable fallback mode of operation when the DCE is operating as the originator;
– <ans_ fbk>, which specifies the acceptable fallback mode of operation when the DCE is operating as the answerer.

at+ es? returns +ES: 3,0,2 (Initiate V. 42 with detection, error control optional; if error control not established, maintain DTE-DCE data rate and use buffered mode with flow control during non-error control operation).

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AT+ Commands
SAM0055-080101 1-28 AT Command Guide

+ETBM
Call Termination Buffer Management
Read Syntax: +ETBM? Parameter: +ETBM=[< pending_ TD>[,< pending_ RD>[,< timer>]]]
This extended-format compound parameter controls the handling of data remaining in DCE buffers upon call termination. It accepts three numeric subparameters:

– <pending_ TD>, which controls how previously-transmitted data remaining in DCE buffers should be handled when the local DTE requests disconnection of the call.
– <pending_ RD>, which controls how previously-transmitted data remaining in DCE buffers should be handled when the remote DCE requests disconnection of the call.
– <timer>, which sets a maximum time limit on how long the DCE will attempt to deliver the buffered data before abandoning the attempt and discarding the remaining data.

at+ etbm? returns +ETBM: 1, 1, 20 (attempt until all data is delivered and acknowledged (ignore timer for 20 seconds); if either remote DCE or local DTE requests disconnect, discard remainder

+GMI
Request Manufacturer Identification
This extended format command causes the DCE to transmit one or more lines of information text, determined by the manufacturer, so that the user of the DCE can identify the manufacturer.
at+ gmi? returns "ESS Technology"

+GMM
Request Model Identification
This extended format command causes the DCE to transmit one or more lines of information text as determined by the manufacturer.

at+ gmm? returns +GMM: ES56T-PI (or any other ESS model number modem)

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AT+ Commands
AT Command Guide 1-29 SAM0055-080101

+GMR
Request Revision Identification
This extended format command causes the DCE to transmit one or more lines of information text, determined by the manufacturer, so that the user of the DCE can identify the version of

the device.
at+ gmr? returns +GMR: V. 4.43. 018-T-PI (or related driver information for any other ESS
model number modem)

+IFC
DTE-DCE Local Flow Control
Parameter
+IFC=[< DCE_ by_ DTE>{, DTE_ by_ DCE>]]
This extended-format compound parameter is used to control the operation of local flow control between the DTE and DCE during the data state when V. 42 error-control is being used, or when fallback to non-error-control mode is specified to include buffering and flow control. It accepts two numeric subparameters:

– <DCE_ by_ DTE>, which specifies the method to be used by the DTE to control the flow of received data from the DCE; and
– <DTE_ by_ DCE>, which specifies the method to be used by the DCE to control the flow of transmitted data from the DTE.
at+ ifc? returns +IFC: 0, 0 (no method used to control transmitted or received data between
DTE and DCE)

+ILRR
DTE-DCE Local Rate Reporting
Parameter
+ILRR=< value>
This extended-format numeric parameter controls whether or not the extended-format "+ ILRR:< rate>" information text is transmitted from the DCE to the DTE.

The format of this intermediate result code is:
+ILRR:< rate>[, <rx_ rate>], e. g. +ILRR: 19 200.
at+ ilrr? returns +ILRR: 0 (reporting of local port rate disabled)

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AT+ Commands
SAM0055-080101 1-30 AT Command Guide

+MR
Modulation Reporting Control
This extended-format numeric parameter controls whether the extended-format +MCR:< carrier> and <+ MRR:< rate> intermediate result codes are transmitted from the

DCE to the DTE.
The format of this information text is:
+MCR:< carrier> e. g., +MCR: V32B
+MRR:< rate>[,< rx_ rate>] e. g., +MRR: 14400
<carrier> string values are defined in the +MS command.
<rate> values are the decimal transmit rates in bits/ s or set to 0 if negotiation failed.
<rx_ rate> may be reported if the modulation negotiated has a different rate for the RXD channel than for the transmit channel.

at+ mr? returns +MR: 0 (Disables reporting of modulation connection [+ MCR: and +MRR: are not transmitted])

+MS Select Modulation
This extended format command selects the modulation, enables or disables automode, and specifies the lowest and highest connection rates, using up to four subparameters.
+MS= <mod>[,[< automode>][,[< min_ rate>][,[< max_ rate>]]]]

<min_ rate>
300 to 57333 Set <min_ rate> = <max_ rate> to force a <max_ rate> <max_ rate>
300 to 57333

<mode> Modulation Possible Rate (bps)
0 V.21 300
1 V.22 1200
2 V.22bis 2400, 1200
9 V.32 9600, 4800
10 V.32bis 14400, 12000, 9600, 7200, 4800
11 V.34 33600, 31200, 28800, 26400, 24000, 21600, 19200, 16800, 14400, 12000, 9600, 7200, 4800, 2400
17 V.90 57, 333 – 33,333
64 Bell 103 300

<automode> Option Selected
0 Automode Disabled
1 Automode Enabled

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AT+ Commands
AT Command Guide 1-31 SAM0055-080101

+PCW
Call Waiting
Parameter:
+PCW=< call waiting>
Description:
This extended-format compound numeric parameter controls the action to be taken upon detection of call waiting in a V. 92 DCE. Implementation of this parameter is mandatory if V. 92 is implemented in the DCE.
Defined values:

Default setting:
0
Read syntax:
at+ pcw??
The DCE transmits a line of information text to the DCE, consisting of:
+PCW:< call waiting>
For example, with the default setting, the DCE would report:
+PCW: 0
Test syntax:
at+ pcw=?
The DCE transmits a string of information text to the DTE, consisting of:
+PCW: (list of supported values of <call waiting>
For example, a DCE that supports all defined setting would report:
+PCW: (0, 1, 2)

Table 1-5: V. 92 -Call Waiting Values
<call waiting> Description
0 Toggle V. 24 Circuit 125 and collect Caller ID, if enabled by +VCID
1 Hang up
2 Ignore v. 92 call waiting

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SAM0055-080101 1-32 AT Command Guide


37 Page 38 39
AT+ Commands
AT Command Guide 1-33 SAM0055-080101

+PIG
PCM Upstream Ignore
Parameter:
+PIG=< value>
Description:
This extended-format compound numeric parameter controls the use of PCM upstream in a V. 92 DCE. Implementation of this parameter is mandatory if V. 92 is implemented in the DCE.
Defined values:

Default setting: 0
Read syntax: at+ pig?
The DCE transmits a line of information text to the DCE, consisting of:
+PIG:< current setting>
For example, with the default setting, the DCE would report:
+PIG: 0
Test syntax :at+ pig=?
The DCE transmits a string of information text to the DTE, consisting of:
+PIG: (list of supported values>
For example, a DCE that supports all defined setting would report:
+PIG: (0, 1)

Table 1-6: V. 92 -Modem on Hold Values
<value> Description
0 Enable PCM upstream
1 Disable PCM upstream


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AT+ Commands
SAM0055-080101 1-34 AT Command Guide

+PMH
Modem on Hold
Parameter:
+PMH=< value>
Description:
This extended-format compound numeric parameter controls whether Modem on Hold (MOH) procedures are enabled during V. 92 operations Implementation of this parameter is mandatory if V. 92 is implemented in the DCE.
Defined values:

Default setting:
0
Read syntax:
AT+ PMH?
The DCE transmits a line of information text to the DCE, consisting of:
+PMH:< current setting>
For example, with the default setting, the DCE would report:
+PMH: 0
Test syntax:
AT+ PMH=?
The DCE transmits a string of information text to the DTE, consisting of:
+PMH: (list of supported values>
For example, a DCE that supports all defined setting would report:
+PMH: (0, 1)

Table 1-7: V. 92 -Modem on Hold Values
<value> Description
0 Enables V. 92 Modem on Hold
1 Disables V. 92 Modem on Hold


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AT+ Commands
AT Command Guide 1-35 SAM0055-080101

+PMHF
V. 92 Modem on Hook Flash
Parameter:
+PMHF=< value>
Description:
This command causes the DCE to go off-hook for a specified period of time and then return on-hook. The specified period of time is normally one-half second, but may be governed bynational regulations. If this command is initiated and the modem is not on hold, ERROR is returned. This command applies on the V. 92 MOH. Implementation of this parameter is mandatory if V. 92 is implemented in the DCE.
Defined values:
None

+PMHR
Initiate Modem on Hold
Parameter:
+PMHR=< value>
Description:
This extended-format command requests the DCE to initiate or to confirm a MOH procedure. The DCE shall return ERROR if MOH is not enabled, or if the DCE is in an idle condition. The DCE shall return the string response _PMHR <value>, where <value> is a decimal value corresponding to the MOH timer value received or the request status during the DCEs MOH exchange procedure as defined in the following table. This response may be dalayed, depending on the context under which the +PMHR command is made, i. e., if the +PMHR is in response to an incoming mMOH or if it is initiating a request. . Implementation of this parameter is mandatory if V. 92 is implemented in the DCE.

Defined values:
Table 1-8: V. 92 -Modem on Hold Response Values
<value> Description
0 V. 92 MOH request denied or not available
1 MOH with 10-second timeout granted
2 MOH with 20-second timeout granted
3 MOH with 30-second timeout granted
4 MOH with 40-second timeout granted
5 MOH with 1 minute timeout granted
6 MOH with 2 minute timeout granted
7 MOH with 3 minute timeout granted
8 MOH with 4 minute timeout granted
9 MOH with 6 minute timeout granted
10 MOH with 8minute timeout granted
11 MOH with 12 minute timeout granted
12 MOH with 16 minute timeout granted
13 MOH with indefinite timeout granted

Read syntax:
at+ pmhr


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AT+ Commands
SAM0055-080101 1-36 AT Command Guide

+PMHT
Modem on Hold Enable Timer
Parameter:
+PMHT=< value>
Description:
This extended-format compound numeric parameter controls whether the modem will grant or deny a MOH request, as well as setting the MOH Timeout. Implementation of this parameter is mandatory if V. 92 is implemented in the DCE.
Defined values:

Table 1-9: V. 92 -Modem on Hold Enable
<value> Description
0 Deny V. 92 MOH request
1 Grant MOH with 10-second timeout
2 Grant MOH with 20-second timeout
3 Grant MOH with 30-second timeout
4 Grant MOH with 40-second timeout
5 Grant MOH with 1 minute timeout
6 Grant MOH with 2 minute timeout
7 Grant MOH with 3 minute timeout
8 Grant MOH with 4 minute timeout
9 Grant MOH with 6 minute timeout
10 Grant MOH with 8 minute timeout
11 Grant MOH with 12 minute timeout
12 Grant MOH with 16 minute timeout
13 Grant MOH with indefinite timeout

Table 1-8: V. 92 -Modem on Hold Response Values (Continued)


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AT+ Commands
AT Command Guide 1-37 SAM0055-080101

Read syntax:
at+ pmht?
The DCE transmits a line of information text to the DCE, consisting of:
+PMHT:< current setting>
For example, with the default setting, the DCE would report:
+PMHT: 0
Test syntax:
at+ pmht=?
The DCE transmits a string of information text to the DTE, consisting of:
+PMHT: (list of supported values>
For example, a DCE that supports all defined setting would report:
+PMHT: (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,11, 12,13)



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AT+ Commands
SAM0055-080101 1-38 AT Command Guide

+PQC
V. 92 Phase 1 and Phase 2 Control
Parameter:
+PQC=< value>
Description:
This extended-format compound numeric parameter controls the global enabling or disabling of the V. 92 shortened Phase 1 and Phase 2 startup procedures, not the initiation thereof. This command is used in conjunction with the +PSS command. Implementation of this parameter is mandatory if V. 92 is implemented in the DCE.

Defined values:

Default setting:
0
Read syntax:
at+ prc?
The DCE transmits a line of information text to the DCE, consisting of:
+PQC:< current setting>
For example, with the default setting, the DCE would report:
+PQC: 0
Test syntax:
at+ prc=?
The DCE transmits a string of information text to the DTE, consisting of:
+PQC: (list of supported values>
For example, a DCE that supports all defined setting would report:
+PQC: (0, 1, 2, 3)

Table 1-10: V. 92 -Phase 1 and Phase 2 Values
<value> Description
0 Enable Short Phase 1 and Short Phase 2
1 Enable Short Phase 1
2 Enable Short Phase 2
3 Disable Short Phase 1 and Short Phase 2


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AT Command Guide 1-39 SAM0055-080101

+PSS
V. 92 Phase 1 and Phase 2 Startup
Parameter:
+PSS=< value>
Description:
This extended-format compound numeric parameter causes a calling DCE to force either a V. 92 short or full startup sequence, as defined by the +PQC command on the next and subsequent connections. Implementation of this parameter is mandatory if V. 92 is implemented in the DCE.

Defined values:

Default setting:
0
Read syntax:
at+ pss?
The DCE transmits a line of information text to the DCE, consisting of:
+PSS:< current setting>
For example, with the default setting, the DCE would report:
+PSS: 0
Test syntax:
at+ pss=?
The DCE transmits a string of information text to the DTE, consisting of:
+PSS: (list of supported values>
For example, a DCE that supports all defined setting would report:
+PSS: (0, 1, 2)

Table 1-11: V. 92 -Phase 1 and Phase 2 Startup Values
<value> Description
0 The DCEs decide whether to use the short startup procedures. The short startup procedures shall only be used if enabled by the +PQC command.

1 Forces the use of the short startup procedures on the next and subsequent con-nections, if they are enabled by the +PQC command.
2 Forces the use of the full startup procedures on the next and subsequent connec-tions, independent of the +PQC command.


44 Page 45 46
AT+ VCID Commands
SAM0055-080101 1-40 AT Command Guide

AT+ VCID Commands

+VCIDn
Caller ID
Enables or disables Caller ID.
+VCID= 0 Disables Caller ID (default).
+VCID= 1 Enables Caller ID with a formatted presentation to the DTE. The modem presents the data items in a <Tag>< Value> pair format. The expected pairs are data, time,
caller code (telephone number), and name.
+VCID= 2 Enables Caller ID with an unformatted presentation to the DTE. The modem presents the entire packet of information, excluding the U's, in ASCII printable hex numbers.

Result Codes:
OK n= 0,1,2.
ERROR Otherwise.
Inquiries:
at-vcid? Retrieves the current Caller ID mode from the modem.

at+ vcid=? Returns the mode capabilities of the modem in a list with each element separated by
commas.

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Formatted Form Reporting
AT Command Guide 1-41 SAM0055-080101

Formatted Form Reporting The modem presents the data in the <tag> = <value> pair format as described in the following table. Spaces are present on both sides of the equal sign.
Table 1-12: Tag Description

Note: The modem does not present any Caller ID information if the DCE detects a checksum error in the Caller ID packet. In the event of an unrecognized data tag, the modem presents the data in ASCII hex numbers following the MESG tag.

Example of Formatted Form Reporting:
1. The following example illustrates the standard Caller ID message packet, which is received between the first and second rings.

First RING;
DATE = 0321
TIME = 1405
NMBR = 5045551234
NAME = JOHN SMITH
Second RING
Third RING
2. The following example illustrates the case where the tag of the packet is not recognized by the modem.

First RING;
MESG = 060342424231
Second RING
Third RING

Tag Description
DATE DATE = MMDD where MM is the month number (01 to 12) and DD is the day number (01 to 31)

TIME TIME = HHMM where HH is the hour number (00 to 23) and MM is the minute number (00 to 59).
NMBR NMBR = <number> or P or O where <number> is the telephone number of the caller, where P indicates that the calling number information is not available since the originating caller has requested private service, and where O indicates that the calling number information is not available or out of service at the calling location.

NAME NAME = <listing name> where <listing name> is the subscription name.
MESG MESG = <data tag> <length of message> <data> <checksum> in printable ASCII hex numbers. This tag indicates a data item not listed above. The message is only possible for Multiple Message Format.

46 Page 47 48
Unformatted Form Reporting
SAM0055-080101 1-42 AT Command Guide

Unformatted Form Reporting The modem presents all information and packet control information found in the message.
The modem, however, excludes the leading U's (channel seizure information) from the presentation. The packet is presented in ASCII printable hex numbers. The modem does not insert spaces, or line feeds, for formatting between bytes or words of the packet.

AT Command Result Codes
The modem responds to commands from the DTE and to activity on the line by signaling to the DTE in the form of result codes. The result codes that the modem can send are described below. Two forms for each result code are available: long-form, an English-like "verbose" response, and short-form, a data-like numeric response (included in parentheses following the long-form).
The long-form code is preceded and terminated by the sequence <CR> < LF>. The short-form is terminated by <CR> only with no preceding sequence.

If result messages are suppressed, nothing is returned to the DTE.
Table 1-13: AT Command Result Codes
No. Verbose Form Description

0 OK The modem returns the OK code to acknowledge the execution of a command line.
1 CONNECT
The modem sends this result code upon connecting when: 1. The line speed is 300 bps and the modem has been instructed to report the line speed to the DTE upon connecting, or 2. The DTE speed is 300 bps and the modem has been instructed to report the DTE speed to the DTE upon connecting, or 3. The range of result code responses is restricted by the X command such that no speed reporting is allowed.
2 RING The modem sends this result code when incoming ringing is detected on the line.
3 NO CARRIER
The modem sends this result code when attempting to establish a call if: 1. No ringback is detected within the period of time determined by register S7, or 2. The modem detects ringback and later doesn't, but no carrier is detected within the period of time determined by register S7. This result code is also used with the modem automatically disconnects due to loss of carrier. If busy tone detection is enforced (see command Xn) NO CARRIER is also used to report busy or circuit busy. If dial tone detection is enforced (see command Xn) NO CARRIER is also used to report no dial tone.
4 ERROR The modem sends this result code if the command line contains a syntax error or it is unable to execute a command contained in the command line. It is issued if a command does not exist or if the parameter supplied is outside the permitted range.


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AT Command Result Codes
AT Command Guide 1-43 SAM0055-080101

5 CONNECT 1200
For X1, X2, X3, and X4, the modem sends this result code when: 1. The line speed is 1200 bps and the modem has been instructed to report the line speed to the DTE upon connecting, or 2. The DTE speed is 1200 bps and the modem has been instructed to report the DTE speed to the DTE upon connecting.
6 NO DIALTONE For X2 and X4, the modem sends this result code if it has been instructed to wait for a dial tone before dialing, but no dial tone is detected.
7 BUSY For X3 and X4, if busy tone detection is enabled, the modem sends this result code, if the busy (engaged) signal is detected on the line.
8 NO ANSWER The modem sends this result code, if the modem detects a continuous ringback signal for the duration set by register S7 while attempting to make a call.
9 CONNECT 0600
For X1, X2, X3, and X4, the modem sends this result code when: 1. The line speed is 600 bps and the modem has been instructed to report the line speed to the DTE upon connecting, or 2. The DTE speed is 600 bps and the modem has been instructed to report the DTE speed to the DTE upon connecting.
10 CONNECT 2400
For X1, X2, X3, and X4, the modem sends this result code when: 1. The line speed is 2400 bps and the modem has been instructed to report the line speed to the DTE upon connecting, or 2. The DTE speed is 2400 BPs and the modem has been instructed to report the DTE speed to the DTE upon connecting.
11 CONNECT 4800 For X1, X2, X3, and X4, the modem sends this result code when the DTE speed is 4800 bps and the modem has been instructed to report the DTE speed upon connecting.
12 CONNECT 9600 For X1, X2, X3, and X4, the modem sends this result code when the DTE speed is 9600 bps and the modem has been instructed to report the DTE speed upon connecting.
13 CONNECT 7200 For X1, X2, X3, and X4, the modem sends this result code when the DTE speed is 7200 bps and the modem has been instructed to report the DTE speed upon connecting.
14 CONNECT 12000 For X1, X2, X3, and X4, the modem sends this result code when the DTE speed is 12000 bps and the modem has been instructed to report the DTE speed upon connecting.
15 CONNECT 14400 For X1, X2, X3, and X4, the modem sends this result code when the DTE speed is 14400 bps and the modem has been instructed to report the DTE speed upon connecting.
16 CONNECT 19200 For X1, X2, X3, and X4, the modem sends this result code when the DTE speed is 19200 bps and the modem has been instructed to report the DTE speed upon connecting.
17 CONNECT 38400 For X1, X2, X3, and X4, the modem sends this result code when the DTE speed is 38400 bps and the modem has been instructed to report the DTE speed upon connecting.
18 CONNECT 57600 For X1, X2, X3, and X4, the modem sends this result code when the DTE speed is 57600 bps and the modem has been instructed to report the DTE speed upon connecting.

Table 1-13: AT Command Result Codes (Continued)
No. Verbose Form Description

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AT Command Result Codes
SAM0055-080101 1-44 AT Command Guide

19 CONNECT 115200 For X1, X2, X3, and X4, the modem sends this result code when the DTE speed is 115200 bps and the modem has been instructed to report the DTE speed upon connecting.
33 FAX The modem returns this result code when a fax modem connection is established in a facsimile mode.
34 +FCERROR The modem returns this result code when high speed fax data (V. 27, V. 29, V. 33, or V. 17) is expected and a V. 21 signal is received.
35 DATA The modem returns this result code when a data modem connection is established in a facsimile mode.
40 CARRIER 300 The modem returns this result code when Bell 103 carrier has been detected on the line and carrier reporting is enabled.
44 CARRIER 1200/ 75 The modem returns this result code when V. 23 backward channel carrier has been detected on the line and carrier reporting is enabled.
45 CARRIER 75/ 1200 The modem returns this result code when V. 23 forward channel carrier has been detected on the line and carrier reporting is enabled.
47 CARRIER 2400 The modem sends this result code when either the high or low channel carrier in V. 22bis mode has been detected on the line and carrier reporting is enabled.
48 CARRIER 4800 The modem sends this result code when the 4800 bps data rate in V. 32bis or V. 32 mode has been detected on the line and carrier reporting is enabled.
49 CARRIER 7200 The modem sends this result code when the 7200 bps data rate in V. 32bis mode has been detected on the line and carrier reporting is enabled.
50 CARRIER 9600 The modem sends this result code when the 9600 bps data rate in V. 32bis or V. 32 mode has been detected on the line and carrier reporting is enabled.
51 CARRIER 12000 The modem sends this result code when the 12000 bps data rate in V. 32bis or V. 32 mode has been detected on the line and carrier reporting is enabled.
52 CARRIER 14400 The modem sends this result code when the 14400 bps data rate in V. 32bis or V. 32 mode has been detected on the line and carrier reporting is enabled.
53 CARRIER 16800 The modem sends this result code when the 16800 bps data rate in V. 34 mode has been detected on the line and carrier reporting is enabled.
54 CARRIER 19200 The modem sends this result code when the 19200 bps data rate in V. 34 mode has been detected on the line and carrier reporting is enabled.
55 CARRIER 21600 The modem sends this result code when the 21600 bps data rate in V. 34 mode has been detected on the line and carrier reporting is enabled.
56 CARRIER 24000 The modem sends this result code when the 24000 bps data rate in V. 34 mode has been detected on the line and carrier reporting is enabled.
57 CARRIER 26400 The modem sends this result code when the 26400 bps data rate in V. 34 mode has been detected on the line and carrier reporting is enabled.
58 CARRIER 28800 The modem sends this result code when the 28800 bps data rate in V. 34 mode has been detected on the line and carrier reporting is enabled.
59 CONNECT 16800 For X1, X2, X3, and X4, the modem sends this result code when the DTE speed is 16800 bps and the modem has been instructed to report the DTE speed upon connecting.

Table 1-13: AT Command Result Codes (Continued)
No. Verbose Form Description
49 Page 50 51
AT Command Result Codes
AT Command Guide 1-45 SAM0055-080101

60 CONNECT 31200 For X1, X2, X3, and X4, the modem sends this result code when the DTE speed is 31200 bps and the modem has been instructed to report the DTE speed upon connecting.
61 CONNECT 21600 For X1, X2, X3, and X4, the modem sends this result code when the DTE speed is 21600 bps and the modem has been instructed to report the DTE speed upon connecting.
62 CONNECT 24000 For X1, X2, X3, and X4, the modem sends this result code when the DTE speed is 24000 bps and the modem has been instructed to report the DTE speed upon connecting.
63 CONNECT 26400 For X1, X2, X3, and X4, the modem sends this result code when the DTE speed is 26400 bps and the modem has been instructed to report the DTE speed upon connecting.
64 CONNECT 28800 For X1, X2, X3, and X4, the modem sends this result code when the DTE speed is 28800 bps and the modem has been instructed to report the DTE speed upon connecting.
65 CONNECT 33600 For X1, X2, X3, and X4, the modem sends this result code when the DTE speed is 33600 bps and the modem has been instructed to report the DTE speed upon connecting.
66 COMPRES-SION: CLASS 5 The modem returns this result code to the DTE when the modem has connected in MNP Class 5 and compression reporting is enabled.
67 COMPRES-SION: V. 42 bis The modem returns this result code to the DTE when the modem has connected in V. 42 bis and compression reporting is enabled.
68 COMPRES-SION: v. 44bis The modem returns this result code to the DTE when the modem has connected in V. 44 bis and compression reporting is enabled. .
69 COMPRES-SION: NONE The modem returns this result code to the DTE when the modem has connected without data compression and compression reporting is enabled.
70 PROTOCOL: NONE The modem returns this result code to the DTE when the modem has connected without any form of error correction and the protocol reporting is enabled.
77 PROTOCOL: LAPM The modem returns this result code to the DTE when the modem has connected in the V. 42 LAPM mode of error correction and protocol reporting is enabled.
80 PROTOCOL: ALT The modem returns this result code to the DTE when the modem has connected in the MNP mode of error correction and protocol reporting is enabled.
82 CARRIER 31200 The modem sends this result code when the 31200 bps data rate in V. 34 mode has been detected on the line and carrier reporting is enabled.
83 CARRIER 33600 The modem sends this result code when the 33600 bps data rate in V. 34 mode has been detected on the line and carrier reporting is enabled.
84 CONNECT 230400 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 230400 bps and the modem has been instructed to report the DTE speed upon connecting.
85 CONNECT 460800 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 460800 bps and the modem has been instructed to report the DTE speed upon connecting.

Table 1-13: AT Command Result Codes (Continued)
No. Verbose Form Description

50 Page 51 52
AT Command Result Codes
SAM0055-080101 1-46 AT Command Guide

86 CONNECT 28000 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 28000 bps and the modem has been instructed to report the DTE speed upon connecting.
87 CONNECT 29333 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 29333 bps and the modem has been instructed to report the DTE speed upon connecting.
88 CONNECT 30666 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 30666 bps and the modem has been instructed to report the DTE speed upon connecting.
89 CONNECT 32000 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 32000 bps and the modem has been instructed to report the DTE speed upon connecting.
90 CONNECT 33333 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 33333 bps and the modem has been instructed to report the DTE speed upon connecting.
91 CONNECT 34666 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 34666 bps and the modem has been instructed to report the DTE speed upon connecting.
92 CONNECT 36000 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 36000 bps and the modem has been instructed to report the DTE speed upon connecting.
93 CONNECT 37333 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 37333 bps and the modem has been instructed to report the DTE speed upon connecting.
94 CONNECT 38666 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 38666 bps and the modem has been instructed to report the DTE speed upon connecting.
95 CONNECT 40000 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 40000 bps and the modem has been instructed to report the DTE speed upon connecting.
96 CONNECT 41333 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 41333 bps and the modem has been instructed to report the DTE speed upon connecting.
97 CONNECT 42666 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 426666 bps and the modem has been instructed to report the DTE speed upon connecting.
98 CONNECT 44000 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 44000 bps and the modem has been instructed to report the DTE speed upon connecting.
99 CONNECT 45333 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 45333 bps and the modem has been instructed to report the DTE speed upon connecting.
100 CONNECT 46666 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 46666 bps and the modem has been instructed to report the DTE speed upon connecting.

Table 1-13: AT Command Result Codes (Continued)
No. Verbose Form Description

51 Page 52 53
AT Command Result Codes
AT Command Guide 1-47 SAM0055-080101

101 CONNECT 48000 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 48000 bps and the modem has been instructed to report the DTE speed upon connecting.
102 CONNECT 49333 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 49333 bps and the modem has been instructed to report the DTE speed upon connecting.
103 CONNECT 50666 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 50666 bps and the modem has been instructed to report the DTE speed upon connecting.
104 CONNECT 52000 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 52000 bps and the modem has been instructed to report the DTE speed upon connecting.
105 CONNECT 53333 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 53333 bps and the modem has been instructed to report the DTE speed upon connecting.
106 CONNECT 54666 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 54666 bps and the modem has been instructed to report the DTE speed upon connecting.
107 CONNECT 56000 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 56000 bps and the modem has been instructed to report the DTE speed upon connecting.
108 CONNECT 57333 For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 57333 bps and the modem has been instructed to report the DTE speed upon connecting.
109 CARRIER 28000 The modem sends this result code when the 28000 bps data rate has been detected on the line and carrier reporting is enabled.
110 CARRIER 29333 The modem sends this result code when the 29333 bps data rate has been detected on the line and carrier reporting is enabled.
111 CARRIER 30666 The modem sends this result code when the 30666 bps data rate has been detected on the line and carrier reporting is enabled.
112 CARRIER 32000 The modem sends this result code when the 32000 bps data rate has been detected on the line and carrier reporting is enabled.
113 CARRIER 33333 The modem sends this result code when the 33333 bps data rate has been detected on the line and carrier reporting is enabled.
114 CARRIER 34666 The modem sends this result code when the 34666 bps data rate has been detected on the line and carrier reporting is enabled.
115 CARRIER 36000 The modem sends this result code when the 36000 bps data rate has been detected on the line and carrier reporting is enabled.
116 CARRIER 37333 The modem sends this result code when the 37333 bps data rate has been detected on the line and carrier reporting is enabled.
117 CARRIER 38666 The modem sends this result code when the 38666 bps data rate has been detected on the line and carrier reporting is enabled.
118 CARRIER 40000 The modem sends this result code when the 40000 bps data rate has been detected on the line and carrier reporting is enabled.

Table 1-13: AT Command Result Codes (Continued)
No. Verbose Form Description

52 Page 53 54
AT Command Result Codes
SAM0055-080101 1-48 AT Command Guide

119 CARRIER 41333 The modem sends this result code when the 41333 bps data rate has been detected on the line and carrier reporting is enabled.
120 CARRIER 42666 The modem sends this result code when the 42666 bps data rate has been detected on the line and carrier reporting is enabled.
121 CARRIER 44000 The modem sends this result code when the 44000 bps data rate has been detected on the line and carrier reporting is enabled.
122 CARRIER 45333 The modem sends this result code when the 45333 bps data rate has been detected on the line and carrier reporting is enabled.
123 CARRIER 46666 The modem sends this result code when the 46666 bps data rate has been detected on the line and carrier reporting is enabled.
124 CARRIER 48000 The modem sends this result code when the 48000 bps data rate has been detected on the line and carrier reporting is enabled.
125 CARRIER 49333 The modem sends this result code when the 49333 bps data rate has been detected on the line and carrier reporting is enabled.
126 CARRIER 50666 The modem sends this result code when the 50666 bps data rate has been detected on the line and carrier reporting is enabled.
127 CARRIER 52000 The modem sends this result code when the 52000 bps data rate has been detected on the line and carrier reporting is enabled.
128 CARRIER 53333 The modem sends this result code when the 53333 bps data rate has been detected on the line and carrier reporting is enabled.
129 CARRIER 54666 The modem sends this result code when the 54666 bps data rate has been detected on the line and carrier reporting is enabled.
130 CARRIER 56000 The modem sends this result code when the 56000 bps data rate has been detected on the line and carrier reporting is enabled.
131 CARRIER 57333 The modem sends this result code when the 57333 bps data rate has been detected on the line and carrier reporting is enabled.

Table 1-13: AT Command Result Codes (Continued)
No. Verbose Form Description
53 Page 54 55
AT Command Guide 2-1 SAM0055-080101

Chapter 2
S-Registers

Description The S-registers are summarized along with their default values. Registers or register fields
quoted as "reserved" are reserved for current or future use by the firmware.
All bit-mapped registers are read-only. The appropriate AT command (ATSn) that controls the relevant bits in the S-Register is used to change the S-Register value.

The proper use of the ATSn command is
ATSn= v
where n is the number of the S-register and v is the desired value.

Factory Defaults The factory default values are loaded into the active configuration when Windows is started or by the ATSn command after a warm reset. In addition, the designated default profile is subsequently loaded, and may change some of the factory default values.

The factory default values may be loaded or restored at any time by entering the AT& F0 command.

S-Register Definitions
S0 Number of Rings to Auto-Answer
Sets the number of the rings required before the modem automatically answers a call. Setting this register to zero disables auto-answer mode.
Range: 0-255 rings
Default: 0

S1 Ring Counter
S1 is incremented each time the modem detects a ring signal on the telephone line. S1 is cleared if no rings occur over an eight second interval.
Range: 0-255 rings
Default: 0

54 Page 55 56
S-Register Definitions
SAM0055-080101 2-2 AT Command Guide

S2 Escape Character
S2 holds the decimal value of the ASCII character used as the escape character. The default value corresponds to an ASCII '+ '. A value over 127 disables the escape process, i. e., no escape character will be recognized.
Range: 0-255, ASCII decimal
Default: 43 (+)

S3 Carriage Return Character
Sets the command line and result code terminator character. Pertains to asynchronous operation only.
Range: 0-127, ASCII decimal
Default: 13 (Carriage Return)

S4 Line Feed Character
Sets the character recognized as a line feed. Pertains to asynchronous operation only. The Line Feed control character is output after the Carriage Return control character if verbose result codes are used
Range: 0-127, ASCII decimal
Default: 10 (Line Feed)

S5 Backspace Character
Sets the character recognized as a backspace. Pertains to asynchronous operation only. The modem will not recognize the Backspace character if it is set to a value that is greater than 32 ASCII. This character can be used to edit a command line. When the echo command is enabled, the modem echoes the following to the local DTE: the Backspace character, an ASCII space character, and a second Backspace character. This means a total of three characters are transmitted each time the modem processes the Backspace character.

Range: 0-32, ASCII decimal
Default: 8 (Backspace)

55 Page 56 57
S-Register Definitions
AT Command Guide 2-3 SAM0055-080101

S6 Wait Time for Dial Tone Before Blind Dialing
Sets the length of time, in seconds, that the modem will wait before starting to dial after going off-hook when blind dialing. The "Wait for Dial Tone" call progress feature (W dial modifier in the dial string) will override the value in register S6.
The modem always pauses for a minimum of 2 seconds, even if the value of S6 is less than 2 seconds.

Range: 2-255 seconds
Default: 2

S7 Wait Time For Carrier After Dial, For Silence, or For Dial Tone After W Dial Modifier
Sets the length of time, in seconds, that the modem will wait for carrier before hanging up. The timer is started when the modem finishes dialing (originate), or 2 seconds after going off-hook (answer). In originate mode, the timer is reset upon detection of answer tone if allowed by country restrictions.

Range: 1-255 seconds
Default: 60

S8 Pause Time For Dial Delay
Sets the time, in seconds. that the modem must pause when the "," dial modifier is encountered in the dial string.
Range: 0-255 seconds
Default: 2

S9 Carrier Detect Response Time (not used)
Sets the time, in tenths of a second, that the carrier must be present before the modem considers it valid and turns on RLSD. As this time is increased, there is less chance to detect a false carrier due to noise from the telephone line.
Range: 1-255 tenths of a second

Default: 6 (0. 6 second)

56 Page 57 58
S-Register Definitions
SAM0055-080101 2-4 AT Command Guide

S10 Lost Carrier To Hang Up Delay
Sets the length of time, in tenths of a second, that the modem waits before hanging up after a loss of carrier. This allows for a temporary carrier loss without causing the local modem to disconnect. When register S10 is set to 255, the modem functions as if a carrier is always present.

The actual interval the modem waits before disconnecting is the value in register S10 minus the value in register S9. Therefore, the S10 value must be greater than the S9 value or else the modem disconnects before it recognizes the carrier (not implemented).
Range: 1-255 tenths of a second

Default: 100 (10seconds)

S11 DTMF Tone Duration
Sets the duration of tones in DTMF dialing. This value has no effect on pulse dialing.
Range: 50-255 milliseconds

Default: 70 milliseconds

S12 Escape Prompt Delay (EPD)
Defines the maximum period, in fiftieths of a second, allowed between receipt of the last character of the three escape character sequence from the DTE and sending of the OK result code to the DTE. If any characters are detected during this time, the OK will not be sent. Note that sending of the OK result code does not affect entry into command mode.

Range: 0-255 1/ 50 of a second
Default: 50 (1 second)

S13 Reserved


57 Page 58 59
S-Register Definitions
AT Command Guide 2-5 SAM0055-080101

S14 General Bit Mapped Options Status
Indicates the status of command options.
Default: 138 (8Ah) (10001010b)

Bit Definitions:

S15 Reserved
S16 General Bit Mapped Test Options Status

Indicates the test in progress status.
Default: 0

Bit Definitions:

— T/ P— Vn Qn En x
7 65 43 21 0

Bits Name Description
7: 6 — Reserved.
5 Tone/ Pulse 1 = Pulse.
0 = Tone (Default).
4 — Reserved.
3 Result Codes 1 = Verbose, V1 (Default).
0 = Numeric, V0.
2 Quiet Mode 1 = Do not send result codes, Q1.
0 = Send result codes, Q0 (Default).
1 Command Echo 1 = Command Echo enabled, E1 (Default).
0 = Command Echo disabled, E0.
0 – This bit is ignored.

——& T1
7 65 43 21 0

Bits Name Description 7: 2 — Reserved.
1 — Not used. 0 Local analog
loopback 1 = Enabled (& T1) 0 = Disabled (Default).


58 Page 59 60
S-Register Definitions
SAM0055-080101 2-6 AT Command Guide

S17 – S20 Reserved
S21 V. 24/ General Bit Mapped Options Status

Indicates the status of command options.
Default: 52 (34h) (00110100b)

Bit Definitions:

—0 —& Dn —& Jn
7 65 43 21 0

Bits Name Description
7 — Reserved.
6 DSR behavior Not implemented.
0 = &S0 selected (Default).
5 — Reserved.
4: 3 DTR behavior DTR behavior.

2: 1 — Reserved.
0 Phone jack control Set by &Jn, but otherwise ignored.
0 = &J0 (Default).

bit 3 bit 2 DTR behavior
0 0 &D0 selected (default).
0 1 &D1 selected.
1 0 &D2 selected.
1 1Not u sed.


59 Page 60 61
S-Register Definitions
AT Command Guide 2-7 SAM0055-080101

S22 Speaker/ Results Bit Mapped Options Status
Indicates the status of command options.
Default: 117 (75h) (01110101b)

Bit Definitions:

S23 – S28 Reserved

—XnMnLn
7 65 43 21 0

Bits Name Description
7 — Reserved.
6: 4 Limit result codes Limit result codes.

3: 2 Speaker control Sets the speaker control as defined by Mn.
1: 0 Speaker volume Sets the speaker volume as defined by Ln.

bit 3 bit 1 bit 0 DTR behavior
0 0 0X0.
1 0 0X1.
1 0 1X2.
1 1 0X3.
1 1 1X4 ( default).

bit 3 bit 2 Speaker control
0 0Disabled, M 0.
0 1 Off on carrier, M1 (default).
1 0 Always on, M2.
1 1 On during handshake, M3.

bit 1 bit 0 Speaker volume
0 0 &L0 selected.
0 1 &L1 selected (default).
1 0 &L2 selected.
1 1 &L3 selected.


60 Page 61 62
S-Register Definitions
SAM0055-080101 2-8 AT Command Guide

S29 Flash Dial Modifier Time
Sets the length of time in 10ms units that the modem takes to go on-hook when it receives the flash (!) dial modifier in the dial ring. The time can be limited as it is a country
dependent parameter.
Range: 0-255 10ms intervals.

Default: 5

S30-S36 Reserved


61 Page 62 63
S-Register Definitions
AT Command Guide 2-9 SAM0055-080101

S37 Desired Line Connection Speed
Default: 0
Bit Definitions:

S38-S40 Reserved

— Line connection speed
7 65 43 21 0

Bits Name Description
7: 5 — Reserved.
4: 0 Line connection speed
Desired connection speed. This is interlinked with the Nn command.
bit 4 bit 3 bit 2 bit 1 bit 0 Selection
0 0 0 0 0 Automode connection (default).
0 0 0 0 1 Connect a t 3 00 b ps.
0 0 0 1 0 Connect a t 3 00 b ps.
0 0 0 1 1 Connect a t 3 00 b ps.
0 0 1 0 0 Reserved.
0 0 1 0 1 Connect a t V .22bis 1 200 b ps.
0 0 1 1 0 Connect a t V .22bis 2 400 b ps.
0 0 1 1 1 Reserved.
0 1 0 0 0 Connect a t V .32bis/ V. 32 4 800 b ps.
0 1 0 0 1 Connect a t V .32bis/ V. 32 9 600 b ps.
0 1 0 1 0 Connect a t V .32bis 1 2000 b ps.
0 1 0 1 1 Connect a t V .32bis 1 4400 b ps.
0 1 1 0 0 Connect a t V .32bis 7 200 b ps.
0 1 1 0 1 Reserved.
0 1 1 1 1 Reserved.
1 0 0 0 0 Connect a t V .34 14400 bps.
1 0 0 0 1 Connect a t V .34 16800 bps.
1 0 0 1 0 Connect a t V .34 19200 bps.
1 0 0 1 1 Connect a t V .34 21600 bps.
1 0 1 0 0 Connect a t V .34 24000 bps.
1 0 1 0 1 Connect a t V .34 26400 bps.
1 0 1 1 1 Connect a t V .34 28800 bps.
1 1 0 0 0 Connect a t V .34 33600 bps.

62 Page 63 64
S-Register Definitions
SAM0055-080101 2-10 AT Command Guide

S41 General Bit Mapped Options Status
Indicates the status of command options.
Default: 3 (00000011b)

Bit Definitions:

S42 – S45 Reserved
S46 Data Compression Control
Controls selection of compression. The following actions are executed for the given values:
Range: 136 or 138
Default: 138

S46 = 136 Execute error correction protocol with no compression.
S46 = 138 Execute error correction protocol with compression. (Default.)

—\ Ln\ Gn—% Cn
7 65 43 21 0

Bits Name Description
7: 5 — Reserved.
4 Block m ode control 1 = Block mode (\ L1).
0 = Stream mode (\ L0 default).
3 Modem-to-Modem flow

control
1 = Enabled (\ G1).
0 = Disabled (\ G0 default).

2 — Reserved.
1: 0 Compression selection Selects the compression method.

bit 1 bit 0 Compression method
0 0 Disabled (% C0).
0 1MNP 5 ( %C1).
1 0 V. 42bis (% C2).
1 1 MNP 5 and V. 42bis (% C3 default).

63 Page 64 65
S-Register Definitions
AT Command Guide 2-11 SAM0055-080101

S47-S90 Reserved
S91 Data Mode Transmit Level
Sets the transmit attenuation level from -6 to -15 dBm. In some countries, the transmit level may not be changed.
Range: 6 to 15 (corresponding to -6 to -15 dBm transmit level)
Default: 10 (-10 dBm transmit level)

S92 Fax Transmit Attenuation Level
Set the transmit attenuation level from -6 to -15 dBm for the fax mode. In some countries, the transmit level may not be changed.
Range: 6 to 15 (corresponding to -6 to -15 dBm transmit level)
Default: 10 (-10 dBm transmit level)

S95 Extended Result Code

The bits in this register can be set to override some of the Wn command options. A bit set to a 1 in this register will enable the corresponding result code regardless of the Wn setting.
Default: 0
Bit Definitions:

— Cmp — Prtcl Car ARQ DCE
76 5 43210

Bits Name Description
7: 6 — Reserved.
5 Compression Enable COMPRESSION xxxx result code (xxxx = compression type).
4 — Reserved.
3 Protocol Enable PROTOCOL xxxx result code (xxxx = protocol identifier).
2 Carrier Enable CARRIER xxxx result code (xxxx = rate).
1 ARQ t o Connect Append/ ARQ to CONNECT xxxx result code in error correction mode (xxxx = rate).

0 DCE speed CONNECT result code indicates DCE speed instead of DTE speed.

64 Page 65 66
AT Command Guide 3-1 SAM0055-080101
Chapter 3
Class 1 Fax Commands

Fax I/ O Processing The character format is 8 bits data, no parity, and 1 stop bit. Start and stop elements are
removed from the transmit data and added to the receive data. Both transmit and receive data are buffered. Flow control using XON/ XOFF (DC1/ DC3) or RTS/ CTS is provided.
Unique control character strings are identified, filtered, or reinserted into the I/ O data stream. These control characters and their resultant actions are described below.

Table 3-1: DTE-to-Modem Transmit Data Stream

Table 3-2: Modem-to-DTE Receive Data Stream
The modem also identifies the end of a frame by inserting <DLE>< ETX> into the data stream after the FCS bytes.
Fax Mode Selection Fax class 1 commands are identified in the following table. Fax modes and rates are
determined by the AT+ F commands.
Table 3-3: Fax Class 1 Commands

Fax Origination Origination of fax calls is made using the ATD command. Upon completion of the dial function, a calling tone at 1100 Hz is transmitted, with a cadence of 0.5 seconds on and 3 seconds off. The modem automatically enters mode +FRH= 3 and sends the CONNECT message to the DTE when FSK flags are detected from the remote.

Characters Detected Action Taken
<DLE>< Data> Delete <DLE>< Data> characters.
<DLE>< ETX> Recognize as a string terminator and take appropriate action.
<DLE>< DLE> Replace with single <DLE> character.

Characters Detected Action Taken
<DLE> Insert extra <DLE> ahead of <DLE>.

Command Function +FAE= n
Data/ Fax Auto Answer
+FCLASS= n Service Class
+FRH= n Receive Data with HDLC Framing
+FRM= n Receive Data
+FRS= n Receive Silence
+FTH= n Transmit Data with HDLC Framing
+FTM= n Transmit Data
+FTS= n Stop Transmission and Wait

65 Page 66 67
Fax I/ O Processing
SAM0055-080101 3-2 AT Command Guide

Fax Answering Answering fax calls is identical to answering data calls, with the exception that the modem enters the fax handshaking mode instead of the data handshaking mode after going off-hook. If +FAE= 0, the modem, after sending answer tone, automatically enters fax mode (+ FTH= 3), sends the CONNECT message to the DTE, and starts sending FSK flags. If +FAE= 1, the modem determines whether the caller is a data modem or fax modem and sends the relevant DATA or FAX result code to the DTE.
Fax Transmission Control Fax transmission control is initiated by the +FTH= n command. After this command is issued, the modem generates the CONNECT message and transmits a carrier in the modulation scheme specified by the parameter n. The modem then transmits HDLC flags for a minimum of 1 second. The modem continues to transmit the HDLC flags until it receives a character from the DTE.
When characters are received from the DTE, the modem adds start and end flags, performs zero-bit insertion, generates FCS, and deletes <DLE>< chr> character pairs before
transmitting the characters to the remote fax machine. Each <DLE>< DLE> sequence is transmitted as a single <DLE>. <DLE>< ETX> is considered as the end of frame marker and is not transmitted. All data received from the DTE after <DLE>< ETX> is ignored by the modem until the modem generates either the CONNECT, OK, or ERROR result code.
If no more data is in the transmit buffer and the final bit was a 1 (bit 4 of the second byte received from the DTE), the modem generates the OK result code and returns to the
command mode. If the final bit was a 0, the modem generates the CONNECT message and waits for further data from the DTE while transmitting HDLC flags. If no more data is
received before 5 seconds elapse, the modem drops carrier, goes on-hook, and generates the ERROR result code.
Fax Reception Control Fax reception control is initiated using the AT+ FRH= n command. After this command is issued, the modem looks for a carrier in the modulation scheme specified by the parameter n. If no carrier is detected before the period of time specified by register S7 expires, the modem generates the NO CARRIER message and returns to command mode. If a carrier is detected that is not the one specified by the parameter n, the modem generates the +FCERROR message and returns to the command mode. If the specified carrier is detected, the modem generates the CONNECT message and enters the HDLC receive mode.
In HDLC receive mode, the modem receives HDLC frames from the remote fax machine, strips the flags, performs zero-bit deletion, performs error checking, and handles
<DLE>< chr> character pairs before passing the data to the DTE. The modem prefixes each <DLE> character with another <DLE> character before sending it to the DTE. After the last byte in the frame, the modem sends <DLE>< ETX> to the DTE marking the end of the frame. The modem then generates either the OK message if no errors were detected or the ERROR message if errors were detected (FCS is incorrect), and returns to command mode.

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Fax I/ O Processing
AT Command Guide 3-3 SAM0055-080101

While in command mode, the modem continues to receive data in the selected modulation scheme, and sends the data after sending the CONNECT message to the DTE when the DTE reissues the +FRH command with the same parameter. If the DTE issues the +FRH command with a different parameter, the modem clears all buffers and proceeds as
described previously.
If the carrier is lost while in command mode and the DTE reissues the +FRH command with the same parameter, and there are no data in the buffer, the modem sends the ERRORresult code to the DTE and returns to the command mode. If there are data in the buffer, the modem sends the next frame of buffered data to the DTE, followed by <DLE>< ETX>, and either the ERROR result code if errors were detected or the OK result code if no errors were detected. The modem then returns to command mode.

The modem concludes an error is detected if the carrier is lost for any period of time during or before the reception of a frame. If the carrier is lost for a time period longer than the time specified by the register S10, the modem finishes delivering the data in the receive buffer (if any) to the DTE, sends <DLE>< ETX>, generates the ERROR message, and returns to command mode. All subsequent data received from the remote are discarded.
If the modem detects a frame abort sequence (seven consecutive ones with no zero insertion) while it is waiting for a frame beginning flag (it was receiving HDLC flags), it will wait for the HDLC flags again until either the carrier is lost or the DTE aborts the process by sending an abort character or by dropping DTR with &D2 in effect. If the frame abort
sequence is detected while the modem is receiving a frame, it finishes delivering the data in the receive buffer (if any) to the DTE, sends <DLE>< ETX>, generates the ERROR message, and returns to command mode. The modem keeps looking for HDLC flags followed by more data from the remote, with the selected modulation scheme.

If the modem detects a receive buffer overflow condition, it concludes that there was an FCS error in that frame. The modem will receive more frames only if a starting flag is detected and there is room in the receive buffer. If a starting flag is detected and there is no room in the buffer, the modem discards all data in that frame.

If the modem receives any character from the DTE after the +FRH command (except flow control characters if software flow control is in effect), or if the modem detects a high-to-low transition of the DTR signal while &D1 is in effect, it sends <DLE>< ETX> to the DTE, generates OK result code, and returns to command mode. The receive buffer is cleared and all data received from the remote are discarded. If the modem detects a DTR drop while &D2 is in effect, it goes on-hook, sends <DLE>< ETX> to the DTE, generates OK result code, and returns to command mode. If the modem detects a DTR drop while &D3 is in effect, the modem performs a warm reset.

Fax Data Transmission Fax data transmission is initiated by the AT+ FTM= n command. After this command is issued, the modem generates the CONNECT message and transmits a carrier in the modulation scheme specified by the parameter n. The modem then transmits constant 1 bits until it receives a character from the DTE.
When data are received from the DTE, the modem deletes start and stop bits and deletes all <DLE>< chr> character pairs before transmitting the data to the remote. Each

 


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Fax I/ O Processing
SAM0055-080101 3-4 AT Command Guide

<DLE>< DLE> sequence is transmitted as a single <DLE>. <DLE>< ETX> is considered as the end of stream marker, and is not transmitted. All data received from the DTE after the <DLE>< ETX> are ignored by the modem until the modem generates either the CONNECT, OK, or ERROR result code.
If no more data are in the transmit buffer, and the last transmitted character was not an ASCII NULL, the modem generates the OK result code and returns to the command mode. If the last character transmitted was an ASCII NULL, the modem generates the CONNECT message to the DTE and waits for further data from the DTE while transmitting NULLs to the remote. If more data are received before five seconds elapse, the modem continues to transmit the data as described in the previous paragraph. If five seconds elapse and no data are received from the DTE, the modem drops carrier, goes on-hook, and generates the ERROR result code.

Fax Data Reception Fax data reception is initiated using the AT+ FRM= n command. After this command is issued, the modem looks for a carrier in the modulation scheme specified by the parameter n. If no carrier is detected before the period of time specified by register S7 expires, the modem generates the NO CARRIER message and returns to command mode. If a V. 21 carrier is detected when a high-speed carrier is expected, the modem generates the +FCERROR message and returns to the command mode. If the specified carrier is detected, the modem generates the CONNECT message and enters the data receive mode.

While in data receive mode, the modem receives data from the remote, adds start and stop bits, and handles <DLE>< chr> character pairs before passing the data to the DTE. The modem prefixes each <DLE> character with another <DLE> character before sending it to the DTE.

If a carrier is lost for a time period longer than the time specified by the register S10, the modem finishes delivering the data in the receive buffer (if any) to the DTE, sends
<DLE>< ETX>, generates the NO CARRIER result code, and returns to the command mode. All subsequent data received from the remote are discarded.

If the modem detects a receive buffer overflow condition, it stops receiving from the remote until there is room in the receive buffer. The modem informs the DTE of the buffer overflow after it sends to the DTE the last character that was stored in the buffer before the overflow occurred.

If the modem receives any character from the DTE after the +FRM command (except flow control characters if software flow control is in effect), or if the modem detects a high-to-low transition of the DTR signal while &D1 is in effect, it sends <DLE>< ETX> to the DTE, generates the OK result code, and returns to command mode. The receive buffer is cleared and all data received from the remote are discarded. If loss of DTR is detected while &D2 is in effect, the modem goes on-hook, sends <DLE>< ETX> followed by OK result code to the DTE, and returns to command mode. If the modem detects a DTR drop while &D3 is in effect, the modem performs a warm reset.

68 Page 69 70
Class 1 Fax Commands
AT Command Guide 3-5 SAM0055-080101

Class 1 Fax Commands
+FAE= n
Data/ Fax Auto Answer
+FAE= n allows the DTE to either restrict answering to class 1, or to automatically detect whether the calling station is a fax class 1 modem or data modem, and answer accordingly.

Parameters: n = 0 or 1
Command options:
n = 0 Disable data/ fax auto answer mode. The modem answers as a fax modem only (Default.).

n = 1 Enable data/ fax auto answer mode. The modem answers as a fax or data modem.
After a data (not fax) connection is achieved (indicated by the DATA result code), the DTE must issue an ATO command to cause the modem to go on-line.

+FCLASS= n
Select Service Class
+FCLASS= n command sets the active service class.
Parameters: 0-1
Command options:
+FCLASS= 0 Select Data Mode (Default.)

+FCLASS= 1 Select Facsimile Class 1
+FCLASS= 2 Select Facsimile Class 2 (not implemented)

+F< command>?
Report Active Configuration
+F< command>? interrogates the modem to determine the active configuration.
Typical responses are:
+FAE? 0 if auto answer is disabled; 1 if auto answer is enabled
+FCLASS? 0 if in data mode; 1 if in fax class 1; 2 if in fax class 2

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Class 1 Fax Commands
SAM0055-080101 3-6 AT Command Guide

+F< command>=?
Report Operating Capabilities
+F< command>=? can be used to determine the operating capabilities of the modem.
Typical responses are:
+FAE=? 0 or 1
+FCLASS=? 0, 1, or 2
+FTM=? 24, 48, 72, 96 (9600 bps version)
+FRM=? 24, 48, 72, 96 (9600 bps version)
+FTM=? 24, 48, 72, 73, 74, 96, 97, 98, 121, 122, 145, 146 (14400 bps version)
+FRM=? 24, 48, 72, 73, 74, 96, 97, 98, 121,122, 145, 146 (14400 bps version)

+FRH= n
Receive Data with HDLC Framing
Receive Data with HDLC Framing
+FRH= n causes the modem to receive frames using HDLC protocol and the modulation defined below. An ERROR response code results if this command is issued while the modem is on-hook.
Parameters: See Command options.
Command options:
+FRH= 3 V. 21 channel 2, 300 bps
+FRH= 24 V. 27 ter 2400 bps
+FRH= 48 V. 27 ter 4800 bps
+FRH= 72 V. 29 7200 bps
+FRH= 73 V. 17 7200 bps long
+FRH= 74 V. 17 7200 bps short
+FRH= 96 V. 29 9600 bps
+FRH= 97 V. 17 9600 bps long
+FRH= 98 V. 17 9600 bps short
+FRH= 121 V. 17 12000 bps long
+FRH= 122 V. 17 12000 bps short
+FRH= 145 V. 17 14400 bps long
+FRH= 146 V. 17 14400 bps short

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Class 1 Fax Commands
AT Command Guide 3-7 SAM0055-080101

+FRM= n
Receive Data
+FRM= n causes the modem to enter the receiver mode using the modulation defined below. An ERROR response code results if this command is issued while the modem is on-hook.

Parameters: See Command options.
Command options:
+FRM= 24 V. 27 ter 2400 bps
+FRM= 48 V. 27 ter 4800 bps
+FRM= 72 V. 29 7200 bps
+FRM= 73 V. 17 7200 bps long
+FRM= 74 V. 17 7200 bps short
+FRM= 96 V. 29 9600 bps
+FRM= 97 V. 17 9600 bps long
+FRM= 98 V. 17 9600 bps short
+FRM= 121 V. 17 12000 bps long
+FRM= 122 V. 17 12000 bps short
+FRM= 145 V. 17 14400 bps long
+FRM= 146 V. 17 14400 bps short

+FRS= n
Receive Silence
+FRS= n (n= 0 to 255) causes the modem to report back to the DTE with an OK result code after n 10 ms-intervals of silence have been detected on the line. This command is aborted if any character is received from the DTE. The modem discards the aborting character and issues an OK result code. An ERROR response code results if this command is issued while the modem is on-hook.

+FTH= n Transmit Data with HDLC Framing
Transmit Data with HDLC Framing
+FTH= n causes the modem to transmit data using HDLC protocol and the modulation defined below. An ERROR response code results if this command is issued while the modem is on hook.
Parameters: See Command options.
Command options:
+FTH= 3 V. 21 channel 2, 300 bps
+FTH= 24 V. 27 ter 2400 bps

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Class 1 Fax Commands
SAM0055-080101 3-8 AT Command Guide

+FTH= 48 V. 27 ter 4800 bps
+FTH= 72 V. 29 7200 bps
+FTH= 73 V. 17 7200 bps long
+FTH= 74 V. 17 7200 bps short
+FTH= 96 V. 29 9600 bps
+FTH= 97 V. 17 9600 bps long
+FTH= 98 V. 17 9600 bps short
+FTH= 121 V. 17 12000 bps long
+FTH= 122 V. 17 12000 bps short
+FTH= 145 V. 17 14400 bps long
+FTH= 146 V. 17 14400 bps short

+FTM= n
Transmit Data
+FTM= n causes the modem to transmit data using the modulation defined below. An ERROR response code results if this command is issued while the modem is on-hook.

Parameters: See Command options.
Command options:
+FTM= 24 V. 27 ter 2400 bps
+FTM= 48 V. 27 ter 4800 bps
+FTM= 72 V. 29 7200 bps
+FTM= 73 V. 17 7200 bps long
+FTM= 74 V. 17 7200 bps short
+FTM= 96 V. 29 9600 bps
+FTM= 97 V. 17 9600 bps long
+FTM= 98 V. 17 9600 bps short
+FTM= 121 V. 17 12000 bps long
+FTM= 122 V. 17 12000 bps short
+FTM= 145 V. 17 14400 bps long
+FTM= 146 V. 17 14400 bps short

+FTS= n
Stop Transmission and Wait
+FTS= n (n= 0 to 255) causes the modem to terminate a transmission and wait for n 10-ms intervals before responding with the OK result code. An ERROR response code results if this command is issued while the modem is on-hook.

72 Page 73 74
Class 1 Fax Commands
AT Command Guide 3-9 SAM0055-080101

Example Sessions
Tables 3-4 and 3-5 show examples of one page calling and answering sequences, respectively.

Table 3-4: Calling Sequence, One Page
DTE Com-mand DCE Response Remote Fax Notes

(1) AT+ FCLASS= 1 (2) OK Set to Class 1
PHASE A (3) ATDT6163 (4) Dials (5) Answers +FRH= 3 (implied)
(6) Connect (7) Send HDLC flags
PHASE B (8) Send NSF frame
(9) <NSF>, OK
(10) AT+ FRH= 3 (11) Connect (12) Send CSI frame
(13) <CSI>, OK
(14) AT+ FRH= 3 (15) Connect (16) Send DIS frame Last frame bit= 1
(17) <DIS>, OK (18) Drop carrier
(19) AT+ FTH= 3 (20) Send HDLC flags (21) Receive flags
(21) Connect
(22)< TSI> (23) Send TSI frame (24) Send TSI Last frame bit= 0
(25) Connect
(26) <DCS> (27) Send DCS frame (28) Send DCS Last frame bit= 1
(29) Detect last frame bit
(30) OK, drop carrier
(31) AT+ FTS= 8 (32) OK, wait 80ms
(33) AT+ FTM= 96 (34) Send V. 29
(35) Connect
(36) <TCF> (37) Send TCF data (38) Receive & check
(39) OK
(40) AT+ FRH= 3 (41) Connect
(42) Send CFR frame Last frame bit= 1
(43) <CFR>, OK (44) Drop carrier
(45) OK
PHASE C (46)
AT+ FTM= 96 (47) Send V. 29
(48) Connect
(49) Age data (50) Send page data (51) Receive data
(52) OK
(53) AT+ FTH= 3 (54) Send HDLC flags (55) Receive flags


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Class 1 Fax Commands
SAM0055-080101 3-10 AT Command Guide

(56) Connect
PHASE D (57) <EOP> (58) Send EOP frame (59) Receive EOP Last frame bit= 1
(60) OK, drop carrier
(61) AT+ FRH= 3 (62) Connect (63) Send MCF frame Last frame bit= 1
(64) <MCF>, OK
(65) AT+ FTH= 3 (66) Send HDLC flags (67) Receive flags
(68) Connect
(69) <DCN> (70) Send DCN frame (71) Receive DCN Last frame bit= 1
(72) OK, drop carrier
PHASE E (73) ATH0 (74) OK, hang up (75) Hang up

DTE Com-mand DCE Response Remote Fax Notes
(1) AT+ FCLASS= 1 (2) OK Set to Class 1

Table 3-5: Answering Sequence, One Page
DTE Com-mand DCE Response Remote Fax Notes

(1) AT+ FCLASS =1
(2) OK Set to Class 1

PHASE A (3) Fax machine dials
(4) Ring
(5) ATA (6) Modem answers
(7) Send HDLC flags (8) Receive flags +FRH= 3 (implied)
(9) Connect

PHASE B (10) <NSF> (11) Send NSF frame (12) Receive NSF Last frame bit= 0

(13) Connect
(14) <CSI> (15) Send CSI frame (16) Receive CSI Last frame bit= 0
(17) Connect
(18) <DIS> (19) Send DIS frame (20) Receive DSI Last frame bit= 1
(21) OK, drop carrier
(22) AT+ FRH= 3 (23) Connect (24) Send TSI frame Last frame bit= 0
(25) <TSI>, OK
(26) AT+ FRH= 3 (27) Connect (28) Send DSI frame Last frame bit= 1
(29) <DCS>, OK (30) Drop carrier

Table 3-4: Calling Sequence, One Page (Continued)
DTE Com-mand DCE Response Remote Fax Notes


74 Page 75 76
Class 1 Fax Commands
AT Command Guide 3-11 SAM0055-080101

(31) AT+ FRM= 96 (32) Send V. 29
(33) Connect (34) Send TCF frame
(35) <TCF> (36) Drop carrier
(37) No Carrier
(38) AT+ FTH= 3 (39) Connect
(40) <CFR> (41) Send CFR frame (42) Receive CFR Last frame bit= 1
(43) OK, drop carrier

PHASE C (44)

AT+ FRM= 96 (45) Send page data
(46) <page data> (47) Drop carrier
(48) No Carrier

PHASE D (49)

AT+ FRH= 3 (50) Connect (51) Send EOP frame Last frame bit= 1
(52) <EOP>, OK
(53) AT+ FTH= 3 (54) Connect
(55) <MCF> (56) Send MCF frame (57) Receive MCF Last frame bit= 1
(58) OK, drop carrier
(59) AT+ FRH= 3 (60) Connect (61) Send DCN frame Last frame bit= 1
(62) <DCN>, OK
PHASE E (73) ATH0 (74) OK, hang up (75) Hang up

DTE Com-mand DCE Response Remote Fax Notes
(1) AT+ FCLASS =1
(2) OK Set to Class 1

Table 3-5: Answering Sequence, One Page (Continued)
DTE Com-mand DCE Response Remote Fax Notes


75 Page 76 77
AT Command Guide 4-1 SAM0055-080101
Chapter 4

Class 2 Fax Commands

Command Syntax and Guidelines
DTE Commands The ISO 646 character set (CCITT T. 50 International Alphabet 5, American Standard Code for Information Interchange) is used for issuing commands and responses. Only the low-order 7 bits of each character are used for commands or parameters; the high order bit is ignored. Upper case characters are equivalent to lower case characters. For Phase C data transmission or reception, all 8 bits are needed.

DTE Command Lines A command line is a string of characters sent from a DTE to the modem (DCE) while the modem is in a command state. A command line has a prefix, a body, and a terminator. Each command line (with the exception of the A/ command) must begin with the character sequence AT and must be terminated by a carriage return. Commands entered in upper case or lower case are accepted, but both the A and T must be of the same case, i. e., "AT" = ASCII
065, 084 or "at" = ASCII 097, 116.
The body is a string of commands restricted to printable ASCII characters (032 -126). Space characters (ASCII 032) and control characters other than CR (ASCII 013) and BS (ASCII 010) in the command string are ignored. The default terminator is the ASCII <CR> character. Characters that precede the AT prefix are ignored. The command line
interpretation begins upon receipt of the carriage return character.
Fax Command Syntax After the "AT" or "at" prefix, facsimile commands use extended syntax. Each command is preceded by the "+ F" character and consists of single characters and a decimal parameter (if applicable) terminated by the semicolon ":" character (ASCII 059) or by the <CR> that terminated the command line. A missing decimal parameter is evaluated as 0.
For example, the command to instruct the modem to automatically answer a data or fax call and also enable reception is:

AT+ FAE= 0; +FCR 1 <CR>
Basic data mode and fax service class mode select commands are:
AT+ FCLASS= 0 <CR> for Data Mode
AT+ FCLASS= 1 <CR> for Service Class 1 Fax
AT+ FCLASS= 2 <CR> for Service Class 2 Fax

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Command Syntax and Guidelines
SAM0055-080101 4-2 AT Command Guide

In Class 2, the DCE makes and terminates calls, manages the communication session and negotiates (T. 30 protocol) and transports the image data to DTE. The T. 4 protocol
management of image data, etc., is done by DTE.
The response to
AT+ FCLASS= 0< CR> in Data Mode; or

AT+ FCLASS= 2< CR> in Service Class 2 Fax
is
OK.

The service class may be set by the DTE from the choices available using the "+ FCLASS=< VALUE>" command.

General Rules: 1. +Fnnn commands must be entered completely, otherwise an ERROR response is sent.
2. All response messages are preceded and followed by <CR>< LF>. Multiple response commands (e. g., +FDIS: +FCSI: and +FDCS:) will, therefore, appear to a have a blank
line between them.
3. Class 2 Fax commands can be separated by the ":" character. The ";" character can be omitted if desired. Note that non-data commands cannot be separated by the ";" which is allowed as a dial modifier.
4. All Class 2 commands are assumed to be the final command on a command line. Additional characters will be ignored.
5. An ERROR message will be generated if any of the following conditions occur:
a. A Class 1 command is received while in Class 2.
b. A Class 2 command is received while in Class 1.
c. A Class 1 or Class 2 action command is received while in data modem mode.
d. A Class 2 read-only parameter is given the "=" form of a +F command (e. g., AT+ FAXERR= 5).

Table 4-1: Class 2 Fax Commands
Type of Command Command Function Service Class ID ATA Answer a cal l

Action ATD Originate a call +FCLASS= Service Class
+FDR Begin or continue Phase C receive data
+FDT Data transmission
+FET= n Transmit Page Punctuation
+FK Session termination

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Command Syntax and Guidelines
AT Command Guide 4-3 SAM0055-080101

Serial Port Speed and Flow Control During fax mode, the DTE-DCE port speed is 19200 bps.
Data Stream Termination The DCE exchanges streams of data with the DTE while executing data transfer commands.
These data streams use the termination described in Section 3.2/ ISO 2111.
The ASCII <DLE> character (016) is used as a special character to shield special characters. The <DLE>< ETX> character pair (< 016>< 003>) is used to mark the end of a stream. Thefollowing patterns are used:
any data...< DLE>< ETX> end of stream
any data...< DLE>< DLE> single <DLE> in data
any data...< DLE>< any byte> delete <DLE>< any byte>

DTE to DCE Streams The DCE filters the data stream from the DTE, and removes all character pairs beginning

with <DLE>. The DCE recognizes <DLE>< ETX> as the stream terminator. The DCE recognizes <DLE>< DLE> and reinserts a single <DLE> in its place.

DCE Responses +FCON Facsimile connection response +FDCS: Report current session
+FDIS: Report remote identification
+FCFR Indicate confirmation to receive
+FTSI: Report the transmit station ID
+FCSI: Report the called station ID
+FPTS: Page transfer status
+FET: Post page message response
+FHNG Call termination with status
Session Parameters +FMFR? Identify manufacturer +FMDL? Identify model

+FREV? Identify revision
+FDCC= DCE capabilities parameters
+FDIS= Current sessions parameters
+FDCS= Current session results
+FLID= Local ID string
+FCR Capability to receive
+FPTS= Page transfer status
+FCR= Capability to receive
+FPHCTO Phase C time out
+FAXERR Fax error value
+FBOR Phase C data bit order

Type of Command Command Function Service Class ID +FCLASS= Service Class

Action D Originate a call

Table 4-1: Class 2 Fax Commands (Continued)
Type of Command Command Function

78 Page 79 80
Command Syntax and Guidelines
SAM0055-080101 4-4 AT Command Guide

The DTE must filter stream data to the DCE, and insert extra <DLE> characters ahead of data.
DCE to DTE Streams The DTE must filter the data stream from the DCE, and remove all character pairs beginning with <DLE>. The DTE must recognize <DLE>< ETX> as the stream terminator. The DTE must recognize <DLE>< DLE> and reinsert a single <DLE> in its place.

The DCE filters stream data to the DTE, and inserts extra <DLE> characters ahead of data.
Identification of T. 30 Options Group 3 devices negotiate session parameters in DIS, DCS, and DTC frames. These parameters are defined in Table 4-2, "T. 30 Session Subparameter Codes."
Table 4-2: T. 30 Session Subparameter Codes Label Function Value Description

VR Vertical Resolution 0 1 Normal, 98 lpi Fine, 196 lpi
BR Bit Rate 0
1 2
3 4
5

+FDCS (originate) +FDIS (answer) 2400 bps/ V. 27ter V. 27ter (2400 only)
4800 bps/ V. 27ter V. 27ter 7200 bps/ V. 29 V. 29, V. 27ter
9600 bps/ V. 29 or V. 17 V. 29, V. 27ter 12000 bps/ V. 33 or V. 17 V. 17, V. 33, V. 29, V. 27ter
144000 bps/ V. 33 or V. 17 V. 17, V. 33, V. 29, V. 27ter CCITT T. 30 does not provide for the answering station to specify all speeds exactly using the DIS frame. Implementation of some BR codes by an answering DCE is manufacturer-specific.
WD Page Width 0 1

2 3
4

1728 pixels in 215 mm 2048 pixels in 255 mm
2432 pixels in 303 mm 1216 pixels in 151 mm (not supported)
864 pixels in 107 mm (not supported)
LN Page Length 0 1

2
A4, 297 mm B4, 364 mm
unlimited length
DF Data Compression Format 0 1

2 3
1-D modified Huffman 2-D modified Read (not supported)
3-D uncompressed mode (not supported) 2-D modified Read (not supported)

EC Error Correction (Annex A/ T. 30) 0 1
2
Disable ECM Enable ECM, 64 bytes/ frame (not supported)
Enable ECM, 256 bytes/ frame (not supported)
BF Binary File Transfer 0 1 Disable BFT Enable BFT (not supported)

ST Scan Time/ Line 0
1 2
3 4
5 6
7

VR= normal VR= fine 0 ms 0 ms
5 ms 5 ms 10 ms 5 ms
10 ms 10 ms 20 ms 10 ms
20 ms 20 ms 40 ms 20 ms
40 ms 40 ms


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Service Class 2 Identification and Selection Commands
AT Command Guide 4-5 SAM0055-080101

Session Status Reporting The DCE provides reports to the DTE on the status of a session. The DCE provides the
following status reports:
1. Connection and hang up status: +FCON
+FHNG:< 0-255>
2. Requested DIS session parameters +FDIS: <string> reports remote facsimile capabilities.
Syntax: +FDIS: VR, BR, WD, LN, DF, EC, BF, ST
3. +FDCS: <string> reports the negotiated parameters
4. Phase C prompts: XON, XOFF, DC2
5. Phase C base status reports: depending upon copy quality and related end-of-page status:
+FPTS: <1-5>

Service Class 2 Identification and Selection Commands Three commands report identification and selection information. Each of these three
commands cause the DCE to send a message to the DTE. The messages are programmable using ConfigurACE.

+FMFR?
Request Manufacturer Identification
The +FMFR? command causes the DCE to send a message identifying the DCE manufacturer. The default message is:

ESS Technology, Inc.
OK

+FMDL?
Identify Product Model
The +FMDL? command causes the DCE to send a message identifying the DCE model. The default message is similar to:

ES56V-PI
OK


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Service Class 2 Action Commands
SAM0055-080101 4-6 AT Command Guide

+FREV?
Identify Product Revision
The +FREV? command causes the DCE to send a message identifying the DCE model revision number. The message format is the same as the ATI3 message, e. g:

Version 1.0
OK

Service Class 2 Action Commands
These commands transfer data, and punctuate sessions. They also release specific T. 30 messages. All action commands must be the last command on a command line as indicated by the terminating <CR>.
All action commands initiate processes. The modem will not accept other commands from the DTE until the modem issues a final result code (e. g., OK, CONNECT). The modem will abort the process if it receives any character before the final result code is issued.

ATA
Answer a Call
The DCE can support a DTE command to answer an incoming call using the ATA command (see Chapter 3, Class 1 Fax Commands).

The DTE may issue an Answer command in response to an incoming ring.
If the Answer command is unsuccessful, the DCE will report an appropriate failure or error type result code, such as NO CARRIER (see Example Sessions in Chapter 3, Class 1 Fax Commands).
Manual Call Answer
If this call is successful, the typical DCE response (answer and receive) is:
+FCON

[+ FTSI:< remote ID string>]
+FDCS:< T. 30 subparameter string>
OK
(DTE should issue +FDR command here)


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Service Class 2 Action Commands
AT Command Guide 4-7 SAM0055-080101

Upon receipt of an Answer command from the DTE, the DCE answers and generates the CED tone. The DCE then generates a DIS frame (derived from the +FDIS parameter) and hunts for the first T. 30 negotiation frames. Upon detection of the first Phase B preamble (V. 21 ch 2 modulated by 300 bps HDLC flags), it reports the "+ FCON" message to the DTE.

The DTE should report the initial received T. 30 negotiation messages, including the DCS frame. The +FDCS: report will be followed by the OK final result code.

Automatic Answer
The modem provides for automatic answering of incoming calls. If configured for automatic answer, the modem answers an incoming call in compliance with T. 30, and reports the same messages as described for manual answer.
Connection as a Data Modem
If configured to do so by the +FAA parameter, the DCE will adaptively answer as a facsimile DCE or as a data DCE. If the DCE answers as a data DCE, it resets the +FCLASS parameter to 0 and issues the appropriate final result code (e. g., CONNECT, or NO CARRIER) to the DTE.

ATD
Originate a Call
The DCE can support a DTE command to originate a call using the ATD command (see Chapter 3, Class 1 Fax Commands).

If this command is unsuccessful, the DCE reports an appropriate failure or error type result code such as NO CARRIER, NO DIALTONE, or BUSY (see Example Session in Chapter 3, Class 1 Fax Commands).
If this call is successful, the typical DCE response is:
ATDnn.. nn

(go off-hook, dial, get CED)
+FCON
(DCE detects flags)
[+ FCSI:< remote ID string>]
+FDCS:< T. 30 subparameter string>
OK
The DCE dials, detects call progress, and generates the CNG tone. It then waits for a DIS frame. On detection of the first Phase B preamble (V. 21 ch 2 modulated by 300 bps HDLC flags), it reports the "+ FCON" message to the DTE. The DCE then switches to 19200 bps.
The DCE generates a DCS frame, based on the received DIS frame and on the previously set +FDIS parameter. A +FDT command from the DTE releases the DCE to transmit that DCS frame.

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Service Class 2 Action Commands
SAM0055-080101 4-8 AT Command Guide

The DCE reports the initially received T. 30 negotiation messages, including the DIS frame and the optional CSI ID string. The +FDIS: report is followed by the OK final result code.
+FDR
Begin or Continue Phase C Receive Data
Syntax: +FDR <CR>
Default value: 3 seconds in some places
The +FDR command initiates transition to Phase C data reception. This can occur after answering, dialing, a document is received, or a page is received.

The DCE reports the negotiated T. 30 parameters, with the remote ID information, if available. When the DCE is ready to commence data transfer, it issues a CONNECT
response code.
When the DCE delivers the last byte of a page, the DCE reports the Page Transfer Status via the +FPTS:< ppr> response (Table 4-4, "T. 30 Post Page Response Messages).

After a Page Transfer Status Report, the DCE reports the post page message from the remote facsimile station via the +FET:< ppm> response (Table 4-3, "T. 30 Post Page Message Codes) which signals the intentions of the remote station.
The DCE holds the post page response message to the remote facsimile station (MCF, etc.), represented in the +FPTS parameter until the next +FDR command. The DTE may modify the +FPTS parameter before issuing the +FDR command that releases that message. The DTE must issue a +FDR command to release Post Page Messages.

Initiate Document Reception
The +FDR command may be issued in Phase B after an answer command, or in Phase B after a previous document.

The DCE response in stream mode is:
+FCFR when CFR sent
[+ FTSI:< remote ID string>] if new TSI received
+FDCS:< T. 30 subparameter string>] if new DCS

CONNECT
<Phase C data stream>
<DLE>< ETX>
+FPTS:< ppr>, <lc> [,< blc>, <cblc>]
+FET:< ppm>
OK
(DTE must issue +FDR command to release post page response)


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Service Class 2 Action Commands
AT Command Guide 4-9 SAM0055-080101

Continue Document Reception
The DTE may issue a +FDR command in Phase D, which releases the post page message, and indicates readiness to receive another page after receipt of a Multipage (+ FET: 0) or PPS-NULL (+ FET: 3) message. The DCE response will be:
CONNECT
(< DC2> needed from DTE here)
<Phase C data stream)
<DLE>< ETX>
+FPTS:< ppr>, <lc> [,< blc>, <cblc>]
+FET:< ppm>
OK
(DTE must issue +FDR command to release post page response)

If done receiving:
+FHNG: <hangup cause code>
OK
Continue page reception

Phase C Data Framing
Phase C data may be presented to the DTE in stream mode. The DCE will transfer a stream of data to the DTE, followed by the <DLE>< ETX> stream termination characters. The DCE will filter the stream as described in 4.1. 2.
Phase C Data Format
The received data format is negotiated under T. 30 reported by the +FDCS: (VR, BR, WD, LN, DF, EC, BF, ST) response. The DCE will delete the terminating RTC (6 EOLs) patterns.

+FDT
Data Transmission
The +FDT command prefixes Phase C data transmission. When the DCE is ready to accept Phase C data, it issues the negotiation responses and the CONNECT result code to the DTE.

In Phase B, the +FDT command releases the DCE to proceed with negotiation, and releases the DCS message to the remote station. In Phase C, the +FDT command resumes
transmission after the end of a prior transmit data stream.
Initiate Page Transmission
Phase B DCE polled response:
[+ FCSI:< remote ID string>]-if new CSI received

[+ FDIS:< subparameters from remote station>]-if new DIS received
+FDCS:< T. 30 subparameter string> CONNECT
<XON> -when ready for data


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Service Class 2 Action Commands
SAM0055-080101 4-10 AT Command Guide

After placing a call, or after finishing a document exchange, the DTE may command the DCE to re-enter T. 30 Phase B to attempt to negotiate a document transmission.
Continue a Page
CONNECT

<XON>
The DTE may issue more than one +FDT command for a given page, so that different files may be concatenated together. These files must have the same format.

Phase C Data Framing
Phase C data must be presented to the DCE in stream mode. The DCE expects Phase C data to follow until it detects <DLE>< ETX> termination characters. The DCE will filter the stream as described under "Serial Port Speed and Flow Control. The DCE will acknowledge the end of the data by returning the OK result code to the DTE.
If there is data underrun before the next +FDT or +FET= command, the DCE will zero-fill the pad as per T. 4 until the Phase C timeout (+ FPHCTO) is reached, or until more data are received. The DCE appends an RTC pattern to the transmit data after an +FET= command is received from the DTE.

Phase C Data Format
The Phase C data will be of the format specified by the negotiated T. 30 DCS frame. The +FDCS:< string> response is defined in Table 4-6, "Service Class 2 DCE Responses and the subparameter values are described in Table 4-2, "T. 30 Session Subparameter Codes.
The DCE will use the negotiated minimum Scan Time parameter from the DCS frame, and insert sufficient fill bits to pad each line to the minimum scan time. This is reported in the +FDCS: ST subparameter.
If the DCE finds more than one consecutive EOL in Phase C data (e. g., RTC), it will send only one EOL.

1. Phase C data must conform to T. 4 specifications.
2. The DTE need not include a final RTC, since the DCE will append an RTC in response to an FET= command.
3. Some facsimile machines may treat two EOLs as an RTC.

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Service Class 2 Action Commands
AT Command Guide 4-11 SAM0055-080101
+FET= n
Transmit Page Punctuation
Syntax: +FET=< ppm>[,< pc>,< bc>,< fc>]

DCE response:
+FPTS:< ppr>-when receive from remote OK

This command is used to punctuate page and document transmission after one or more +FDT commands. This command generates T. 30 Post Page Messages selected by the <ppm>code (see Table 4-3, "T. 30 Post Page Message Codes). The +FET=< ppm> command indicates that the current page is complete; no more data will be appended to it. The value indicates whether there are any additional pages are to be sent and, if so, whether there is a change in any of the document parameters. The DTE can command the DCE to generate PRI-Q messages with the +FET=< ppm> command using ppm codes 4-6 (see Table 4-3, "T. 30 Post Page Message Codes).

This command must be sent within the time out specified by +FPHCTO after sending Phase C data, or else the DCE will end the page and document transmission. If the Phase C timeout is reached, the DCE sends an EOP post page message and terminates the session. The remote facsimile station should respond to the post page message with a post page response. The DCE will report this using the +FPTS:< ppr> response (Table 4-4, "T. 30 Post Page Response Messages).

End a Page
The +FET= command causes the DCE to append an RTC (6 EOL) pattern as needed and enter Phase D by sending the selected T. 30 Post Page message.
The +FET= 1 (EOM) command signals the remote station that the next document will have a new DCS negotiated; this causes the session to re-enter Phase B.

Table 4-3: T. 30 Post Page Message Codes ppm Code Mnemonic Description
0 [PPS-] MPS Another page next, same document
1 [PPS-] EOM Another document next
2 [PPS-] EOP No more pages or documents
3 PPS-NULL Another partial page next
4 [ps-] pri-mps Another page, procedure interrupt
5 [PPS-] PRI-EOM Another document, procedure interrupt
6 [PPS-] PRI-EOP All done, procedure interrupt
=8+ ppm Post page message (ppm code)


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Service Class 2 Action Commands
SAM0055-080101 4-12 AT Command Guide

Table 4-4: T. 30 Post Page Response Messages
+FK
Session Termination
Syntax: +FK

The +FK command causes the DCE to terminate the session in an orderly manner. In particular, the DCE will send a DCN message at the next opportunity and hang up. At the end of the termination process, the DCE will report the +FHNG response with result code (Table 4-5, "Hang Up Status Codes).

The DCE will wait until the current page completes, unless the reception is of unlimited length; in that case, the DCE may halt reception and terminate the session at any time.

ppm Code Mnemonic Description
1 MCF Page good
2 RTN Page bad; retrain requested
3 RTP Page good; retrain requested
4 PIN Page bad; interrupt requested
5 PIP Page good; interrupt requested

Table 4-5: Hang Up Status Codes
Code Type Code Cause Description

Call Placement and Ter-mination
0 Normal and proper end of connection
1 Ring detect without successful handshake
2 Call aborted, from +FK or AN
3 No loop current

Transmit Phase A and Miscellaneous Errors 10 Unspecified transmit Phase A error 11 No answer (T. 30 T1 timeout)

Transmit Phase B
20 Unspecified transmit Phase B error
21 Remote cannot receive or send
22 COMREC error in transmit Phase B
23 COMREC invalid command received
24 RSPEC error
25 DCS sent three times without response
26 DIS/ DTC received 3 times; DCS not recognized
27 Failure to train at 2400 bps or +FMINSP value
28 RSPREC invalid response received

Transmit Phase C 40 Unspecified transmit Phase C error 43 DTE to DCE data underflow

87 Page 88 89
Service Class 2 DCE Responses
AT Command Guide 4-13 SAM0055-080101

Service Class 2 DCE Responses The DCE sends information responses to the DTE as a facsimile session proceeds. They indicate the state of the facsimile session and convey needed information. These messages are solicited messages generated in execution of DTE action commands described under "Service Class 2 Action Commands. The DCE precedes and follows the information responses with <CR>< LF>.

The DCE provides the on-line status of several session parameters when they are available during T. 30 handshaking. These include the remote ID string and the DIS/ DCS parameters. These responses report the T. 30 session parameter frames. The subparameters are described in Table 4-2, "T. 30 Session Subparameter Codes.

Transmit Phase D
50 Unspecified transmit Phase D error
51 RSPREC error
52 No response to MPS repeated 3 times
53 Invalid response to MPS
54 No response to EOP repeated 3 times
55 Invalid response to EOP
56 No response to EOM repeated 3 times
57 Invalid response to EOM
58 Unable to continue after PIN or PIP

Receive Phase B (some codes not implemented)

70 Unspecified receive Phase B error
71 RSPREC error
72 COMREC error
73 T. 30 T2 timeout, expected page not received
74 T. 30 T1 timeout after EOM received

Receive Phase C
90 Unspecified receive Phase C error
91 Missing EOL after 5 seconds
92 Unused code
93 DCE to DTE buffer overflow
94 Bad CRC or frame (ECM or BFT modes)

Receive Phase D
100 Unspecified receive Phase D error
101 RSPREC invalid response received
102 COMREC invalid response received
103 Unable to continue after PIN or PIP
Reserved Codes 120-255 Some codes are not implemented

Table 4-5: Hang Up Status Codes (Continued)
Code Type Code Cause Description

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Service Class 2 DCE Responses
SAM0055-080101 4-14 AT Command Guide

Table 4-6: Service Class 2 DCE Responses
Response Name Description +FCON Facsimile Connection

Response +FCON indicates connection with a fax machine. It is released by detection of HDLC flags in the first received frame. +FCON is generated in response to an Originate or Answer command. +FDCS Report Current Session Capabilities Syntax: +FDCS: VR, BR, WD, LN, DF, EC, BF, ST +FDCS:< string> reports the negotiated parameters. Phase C data will be formatted as described by the subparameters. This message may be generated in execution of +FDT or +FDR commands before the
CONNECT result code if new DCS frames are generated or received. See Table 4-2, "T. 30 Session Subparameter Codes.

+FDIS Report Remote Station Capabilities Syntax: +FDIS: VR, BR, WD, LN, DF, EC, BF, ST +FDIS:< string> reports remote facsimile station capabilities andintentions. The parameters are provided in ASCII notation. See Table 4- 2, "T. 30 Session Subparameter Codes. This message is generated in execution of Originate, Answer, +FDT, or +FDR commands.

+FCFR Indicate Confirmation to Receive Syntax: +FCFR The DCE sends a +FCFR response to the DTE upon reception of an acceptable TCF training burst and a valid DCS signal from the remote machine. This indicates that the DCE will receive Phase C data after the remote station receives the local DCE's CFR message. The +FCFR message is generated in execution of a +FDR command.

+FTSI Report the Transmit Station ID Syntax: +FTSI: "< TSI ID string>" Transmit Station ID This response reports the received transmit station ID string, if any. This message is generated in execution of Originate, Answer, +FDT, or +FDR commands.

+FCSI Report the Called Station ID Syntax: +FCSI: "< CSI ID string>" Called Station ID This response reports the received called station ID string, if any. This message is generated in execution of Originate, Answer, +FDT, or +FDR commands.

+FPTS Receive Page Transfer Status Syntax: +FPTS:< ppr>, <lc> [,< blc>, <cblc>] The +FPTS:< ppr> is generated by the DCE at the end of Phase C data reception in execution of a +FDR command. The <ppr> is generated by the DCE; it depends on the DCE capabilities at T. 4 error checking. See Table 4-4, "T. 30 Post Page Response Messages for <ppr> values. The receiving DCE will count the lines. These values are;<lc> = line count <blc = bad line count
<cblc> = <consecutive bad line count A receiving DTE may inspect <ppr> and write a modified value into the +FPTS parameter. The DCE will hold the corresponding Post Page Response message until released by a +FDR command from the DTE.

+FET Post Page Message Response Syntax: +FET:< ppm> The +FET:< post page message> response is generated by a receiving DCE after the end of Phase C reception on receipt of the post-page message from the transmitting station. The +FET:< ppm> response is generated in execution of a +FDR command. The <ppm> codes respond to the T. 30 post page messages See Table 4-3, "T. 30 Post Page Message Codes.
+FPTS Transmit Page Transfer Status Syntax: +FPTS:< ppr> The +FPTS: response reports a <ppr> number representing the copy

quality and related post-page message responses received from the remote DCE. The valid <ppr> values are defined in Table 4-4, "T. 30 Post Page Response Messages. The +FPTS:< ppr> response is generated in execution of a +FET=< ppm> command.

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Service Class 2 Parameters
AT Command Guide 4-15 SAM0055-080101

Service Class 2 Parameters All Service Class 2 parameters can be read, written, and tested for range of legal values by the DCE. The general syntax is described in "Command Syntax and Guidelines". Group 3 FAX devices negotiate session parameters in DIS, DCS, and DTC frames. The following parameters are provided to condition the facsimile DCE for the capabilities it will offer and to report the session settings negotiated.
The three primary T. 30 session parameters are +FDCC, +FDIS and +FDCS. They are compound parameters, using values listed in Table 4-2, "T. 30 Session Subparameter Codes.

+FHNG Call Termination with Status Syntax: +FHNG:< hangup status code> +FHNG indicates that the call has been terminated. The hangup cause is reported and stored in the +FAXERR parameter for later inspection. The <hangup status code> values are described in Table 4-5, "Hang Up Status Codes. +FHNG:< hsc> is a possible intermediate result code to any DTE action command described under "Service Class 2 Action Commands. It is always followed by the OK final result code.
Upon termination of a call, the DCE determines the cause of termination and reports it as part of the FHNG:< hsc> response. It also stores this<hsc> code in the +FAXERR parameter for later inspection. The hangup values are organized according to the phases of the facsimile transaction as defined by T. 30. In the Figure A/ T. 30 flow charts, there are decision boxes labelled "Command Received?"; this is referred to as COMREC in the table. Similarly, decision boxes labelled `Response Received? ' are referred to as RSPREC in the table. A COMREC error or RSPREC error indicates that one of two events occurred: 1) a DCN (disconnect) signal was received, or 2) an FCS error was detected and the incoming signal was still present after 3 seconds. The table values are in decimal notation. Leading zero characters are optional.

Table 4-6: Service Class 2 DCE Responses (Continued)
Response Name Description

90 Page 91 92
Service Class 2 Parameters
SAM0055-080101 4-16 AT Command Guide

Figure 4-1: T. 30 Session Parameter Relationships
+FAXERR
T. 30 Session Error Report
Read syntax: +FAXERR= <table value>, read only
Valid values: 0 -255, see Table 4-5, "Hang Up Status Codes for definitions.
This read- only parameter indicates the cause of the hangup. Table 4-5, "Hang Up Status Codes shows the valid values for this parameter as well as the meaning of the each value.

+FAXERR is set by the DCE at the conclusion of a fax session. The DCE resets +FAXERR to 0 at the beginning of Phase A off-hook time.

+FDCC
DCE Capabilities

+FDIS DCE
Negotiating Position

+FDCS DCE
Negotiating Position

DTE write
DTE read cold write End of Session

DIS/ DTC if received
DIS/ DTE from remote Virtual DIS on receive on send, determine DCS in FAX DCE
DCS if send remote DCS on receive

End of Session 0,0,0, 0,0,0,0,0
DTE write
DCE report
DTE read

DCE report
DTE read

start +FDCC
cold start

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Service Class 2 Parameters
AT Command Guide 4-17 SAM0055-080101

+FBOR
Data Bit Order
Write syntax: +FBOR=< value>
Valid values: 0, 1, 2, or 3
Default value: 0
This parameter controls the mapping between PSTN facsimile data and the DTE-DCE link. There are two choices:

Direct: The first bit transferred to each byte on the DTE-DCE link is the first bit trans-ferred on the PSTN data carrier.

Reversed: The last bit transferred of each byte on the DTE-DCE link is the first bit trans-ferred on the PSTN data carrier. There are two data types to control:
This command controls Phase C data (T. 4 encoded data) transferred during execution of +FDT or +FDR commands.

The following two codes are supported:
+FBOR= 0 or 2 Selects direct bit order for Phase C data.

+FBOR= 1 or 3 Selects reversed bit order for Phase C data.

Note: This parameter does not affect the bit order of control characters generated by the DCE.

+FCQ
Copy Quality Checking
Write syntax: +FCQ=< value>
Valid values: 0
Default value: 0
This parameter controls Copy Quality checking by a receiving facsimile DCE.
The DCE returns +FCQ= 0, which indicates the DCE does no quality checking. The DCE will generate Copy Quality OK (MCF) responses to complete pages, and set +FPTS= 1.

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Service Class 2 Parameters
SAM0055-080101 4-18 AT Command Guide

+FCR
Capability to Receive
Write syntax: +FCR=< value>
Valid values: 0 or 1
Default value: 0
+FCR= 0 indicates that the DCE will not receive message data. This can be used when the DTE has insufficient storage. The DCE can send and can be polled for a file.

+FCR is sampled in CCITT T. 30 Phase A and Phase D.

+FDCC
DCE Capabilities Parameters
Write syntax: +FDCC= VR, BR, WD, LN, DF, ED, BF, ST
Valid values: See Table 4-2, "T. 30 Session Subparameter Codes.
Default values: 0, 5, 0,2, 0,0,0, 0
+FDCC allows the DTE to sense and constrain the capabilities of the facsimile DCE from the choices defined in CCITT T. 30 Table 2. When +FDCC is modified by the DTE, the DCE copies +FDCC into +FDIS.

+FDCS
Current Session Results Parameters
Read syntax: +FDCS?
DCE response: +FDCS= VR, BR, WD, LN, DF, EC, BF, ST
or +FDCS= Valid values: See Table 4-2, "T. 30 Session Subparameter Codes.
Default values: 0, 0, 0,0, 0,0,0, 0
The +FDCS parameter is loaded with the negotiated T. 30 parameters for the current session. A transmitting DCE generates DCS; a receiving DCE gets DCS from the remote station. The DTE may read this parameter.
The +FDCS parameter is initialized 0,0,0,0,0,0,0,0 upon initialization and at the beginning of a session. If the DTE issues a +FDCS? command in the initial state, the DCE reports:

<CR>< LF> 0,0,0,0, 0,0, 0,0< CR>< LF>
The contents of +FDCS are spontaneously reported during execution of +FDR or +FDT commands by the +FDCS: VR, BR, WD, LN, BF, EC, BF, ST response using the same compound parameter format.

93 Page 94 95
Service Class 2 Parameters
AT Command Guide 4-19 SAM0055-080101

Several commands and responses reference T. 30 session negotiated parameters. These are described by a set of common subparameters. These subparameters are described in Table 4-2, "T. 30 Session Subparameter Codes. Optional parameter values are marked with an *. Unspecified parameter values are reserved for future use.

The +FDCC, +FDIS, and +FDCS compound parameters use these session parameters (on writes, unspecified subparameters are unchanged).
The +FDIS:, +FDCS:, and +FDTC: session report responses use these subparameters.
For test response, ranges of values are reported for each subparameter enclosed in parentheses. For example, a DCE response to +FDCC=? could report:

<CR>< LF> (0, 1), (0-5), (0-3), (0-2), (0-2), (0-2), (0), (0-7) <CR>< LF>
Example:
+FDIS= 0,3, 0,2, 0,0, 0,1 =

VR = 0 98 dpi vertical resolution
BR = 5 14400 bit/ s
WD = 0 1728 pixels
LN = 2 unlimited length
DF = 0 1-D modified Huffman coding
EC = 0 no ECM
BF = 0 no BFT
ST = 0 5 ms scan time

+FDIS
Current Sessions Capabilities Parameters
Write syntax: +FDIS= VR, BR, WD, LN, DF, EC, BF, ST
Valid values: See Table 4-2, "T. 30 Session Subparameter Codes.
Default values: 0, 5, 0,2, 0,0,0, 0
The +FDIS parameter allows the DTE to sense and constrain the capabilities used for the current session. The DCE uses +FDIS to generate DIS or DTC messages directly, and uses

+FDIS and received DIS messages to generate DCS messages.
The DCE initializes the +FDIS parameter from the +FDCC parameter on initialization, when +FDCC is written, and at the end of a session.

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Service Class 2 Parameters
SAM0055-080101 4-20 AT Command Guide

+FLID=
Local ID String
Write syntax: +FLID="< local ID string>"
Valid value: 20-character ASCII string
Default value: Empty
If FLID is not a null string, it generates a TSI or CSI frame. Table 3/ T. 30, which outlines the basic bit values for CIG, CSI and TSI framing within the fax information field (FIF) during afax session, includes digits 0-9, "+" and space.
If the DCE supports use of Table 3/ T. 30 only, the response to a +FLID=? command is "( 20) (32, 43, 48-57)." If the DCE supports printable ASCII <, the response is: "( 20) (32-127)< CRLF>." The first "( 20)" represents string length: the second (character values) field reports supported string values.

1. The string is saved in RAM.
2. Non-numeric characters are not filtered out.
3. The string is right justified.

+FPHCTO
DTE Phase C Response Time-out
Write syntax: +FPHCTO=< value>
Valid values: 0 -255, 100 millisecond units.
Default value: 30
The +FPHCTO command determines how long the DCE will wait for a command after reaching the end of data when transmitting in Phase C. When this time-out is reached, the

DCE assumes there are no more pages and no documents to send. It then sends the T. 30 EOP response to the remote device.

+FPTS=
Page Transfer Status
Write Syntax: +FPTS=< ppr>
Valid values: 1, 2, 3, 4, 5
Default value: 0

95 Page 96 97
Example Sessions
AT Command Guide 4-21 SAM0055-080101

The +FPTS parameter contains a value representing the post page response, including copy quality and related end-of-page status. These values correspond to post page response messages defined in T. 30. The receiving DCE sets this parameter after it receives a page of Phase C data. The transmitting DCE sets this parameter with the status reported by the receiving station. The DTE may inspect or modify this parameter.
The set of <ppr> values is defined in Table 4-4, "T. 30 Post Page Response Messages. These values are also reported in the +FPTS response to the +FDR command.

Example Sessions Table 4-7: and Table 4-8: show the typical command and responses for sending and receiving
two pages, respectively.
Table 4-7: Send Two Pages, 1-D Data, No Errors DTE Command DCE Response Local DTE Action Remote Station Action

AT+ CLASS= 2 OK Set Class 2 x
AT+ FLID="< local ID>" OK Set local ID
AT< dial string>

+FCON [+ FCSI:"< csi>"]
+FDIS:< dis codes> OK

Off hook, dial Send CNG
Detect flags [Get CSI]
Get DIS

Answer, Send [CED]
V. 21 flags [CSI]
DIS

AT+ FDT

<1st page data>
<DLE>< ETX>

+FDCS:< DCS codes> CONNECT
<XON>

OK

[Send TSI] Send DCS
Send TCF Get CFR
Send carrier
Send page data

[Get TSI] Get DCS
Get TCF Send CFR
Receive carrier
Receive page data

AT+ FET= 0
+FPTS: 1 OK
Send RTC Get MPS
Get MCF
Get RTC Get MPS
Send MCF

AT+ FDT
<2nd page data> <DLE>< ETX>
CONNECT <XON>

OK
Send carrier
Send page data
Receive carrier
Receive page data

AT+ FET= 2
+FPTS: 1 +FHNG: 0
OK

Send RTC Send EOP
Get MCF Send DCN
Hang up

Get RTC Get EOP
Send MCF Get DCN
Hang up

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Example Sessions
SAM0055-080101 4-22 AT Command Guide

Table 4-8: Receive Two Pages, 1-D Data, No Errors DTE Command DCE Response Local DTE Action Remote Station Action
AT+ FCR= 1 OK Enable reception
AT+ FLI D="< l ocal I D>" OK Set local ID
RING Detect ring Dials[, Send CNG]
ATA

+FCON [+ FTSI:"< tsi>"]
+FDCS:< dcs codes> OK

Off hook Send CED
Send CSI Send DIS
Detect flags [Get TSI]
Get DCS Begin TCF receive

Get CED Get CSI
Get DIS Send V. 21 flags
[Send TSI] Send DCS
Start TCF
AT+ FDR

<DC2>
+FCFR [+ FDCS:"< dcs codes>"]
CONNECT
<page data stream> <DLE>< ETX>
+FPTS: 1, <lc> +FET: 0
OK

Accept TCF Send CFR
Get page carrier Get page data
Detect RTC
Get MPS

Finish TCF Get CFR
Send pager carrier Send page data
Send RTC Drop carrier
Send MPS

AT+ FDR
<DC2> CONNECT <page data stream>
<DLE>< ETX> +FPTS: 1, <lc>
+FET: 2 OK

Send MCF Get page carrier
Get page data
Detect RTC
Get EOP

Get MCF Send page carrier
Send page data
Send RTC Drop carrier
Send EOP

AT+ FDR +FHNG: 0
OK
Send MCF Get DCN Get MCF Send DCN

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AT Command Guide 5-1 SAM0055-080101
Chapter 5

Voice/ Audio Commands

AT Commands

#MDL? or +FMDL?
Identify Model
This command requests the model number or name of the modem.
Example:
#MDL? ES56V-PI

#MFR? or +FMFR?
Identify Manufacturer
This command requests the modem manufacturer.
Example:
#MFR? ESS Technology, Inc.

#REV? or +FREV?
Identify Revision Level
This command requests the revision level of the modem.
Example:
#REV? Version x. x

#VLS or +VLS
Voice Line Select
This command is equivalent to +VLS. See "+ VLS=?" on page 8.

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SAM0055-080101 5-2 AT Command Guide
#VRX or +VRX
Voice Receive
This command is equivalent to +VRX. See command +VRX "Receive Data State" on page 11.

#VTS or +VTS
Generate Tone Signals (Online Voice Command)
This command is equivalent to +VTS. See +VTS command "DTMF and Tone Generation in Voice" on page 15.

#VTX or +VTX
Voice Transmit
This command is equivalent to +VTX. See +VTX command.

+VEM
Event Reporting and Masking
The +VEM command controls which events will be reported to the DTE.
Syntax: +VEM=< mask>

Results:
OK returned to the DTE for all acceptable parameters

ERROR otherwise
<mask> represents a bitfield of which events the DTE wishes to receive. A "1" in this position means to enable that report. NOTE: bit 0 is the most significant bit (big endian).

+VEM?
Upon receiving the +VEM? query, the DCE will display the current value of the event mask. Note that trailing zeros will be displayed.

AT+ VEM?
FFFFFFFF8
OK

Parameter Default Acceptable Values
<mask> FFFFFFFF8 See the table below for bit position descriptions.

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+VEM=?
Upon receiving the AT+ VEM=? query, the DCE will return four lines of information:
1. The service level in quotes (" A", "B", or "C").
2. The capability for the Voice Transmit State.
3. The capability for the Voice Receive State.
4. The capability for the Voice Command State
The capability will be the Hex mask of the events (in the table above) that are supported in the respective mode. This Hex digit will be the logical OR of the respective bit positions.

AT+ VEM=?
"C"
"088A0800"
08EA0800
988A1800
In Table 5-4, "Event Reporting", the column headed "Context" refers to when the command may be generated. Entries may be as follows:

° Data The DCE is in a Voice Receive State, Voice Transmit State, or Voice Translate State
° Command The DCE is in Voice Command State
° Originate The DCE is originating a call
° Answer The DCE is answering a call
° Online The DCE is off-hook, but is not in a data mode
° Anytime This event can be generated in any of the above modes The "Hardware" column specifies whether or not a report is supported by the hardware. An

"N/ A" in the column signifies this report is a software (controller) event and requires nothing from the hardware. An entry in italics signifies that the event is not currently supported.

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SAM0055-080101 5-4 AT Command Guide

Table 5-1: Event Reporting

Bit Position Event Description Context Hardware
0 Caller ID Report Command Yes
1 DID Report N/ A No
2 Distinctive Ring N/ A Yes
3 RING Detected Command Yes
4 DTMF Received Anytime Yes
5 Receive Buffer Overrun Data N/ A
6 Facsimile Calling (1100 Hz) Anytime Yes
7 Data Calling (1300 Hz) N/ A Yes
8 Local Phone On/ Off Hook (Hook switch event) Anytime Yes
9 Presumed Hangup (SILENCE) Time-out Receive N/ A
10 Presumed End of Message (QUIET) Time-out Receive N/ A
11 SIT Tone Detected N/ A No
12 Bong Tone Detected N/ A Yes
13 Loop Current Interruption Anytime Yes
14 Loop Current Polarity Reversal Anytime Yes
15 Call Waiting Beep/ Interrupt N/ A No
16 Distinctive Call Waiting N/ A No
17 TDD Detected (1400/ 1800 Hz) N/ A No
18 Ringback/ Remote Ring Anytime Yes
19 BUSY Anytime Yes
20 DIALTONE Anytime Yes
21 Reorder/ Fast Busy N/ A Yes
22 V. 21 Channel 2 7E flags N/ A N/ A
23 Transmit Buffer Underrun Data N/ A
24 Extension Phone On/ Off Hook N/ A N/ A
25 Facsimile or Data Answer (2100 Hz) Anytime Yes
26 Data Answer (2225 Hz) Anytime Yes
27 Voice Detect Anytime Yes
28 Call Waiting plus Caller Id N/ A No
29 Stuttered Dial tone N/ A N/ A
30 Invalid Voice Data Format Data N/ A
31 Lost Data Detected Event Data N/ A
32 Facsimile Answer Anytime Yes
33 – 63 Reserved

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+VGR=< gain>
Receive Gain Selection

This command causes the DCE to set the gain for the received voice samples.
Subparameter Description:
The receive gain is an unsigned octet where values larger than 128 indicate a larger gain than nominal, and values smaller than 128 indicate a gain smaller than nominal. The nominal value is 128. The largest range of numbers is 0 to 255. The DCE may limit the receive gain to a more narrow range, such as 120 to 136 or 120 to 128. The value of zero is reserved for DCE Automatic Gain Control (AGC).
Result Code:
The DCE shall return the OK result code if the DCE accepts the command. The DCE shall return the ERROR result code if the <gain> subparameter is out of range.

+VGT=< level>
Volume Selection

This command causes the DCE to set the volume level, either by amplifying or attenuating the signal, for the transmitted voice samples.
Subparameter Description:
The transmit gain (or attenuation) is an unsigned octet, where values larger than 128 indicate a larger gain than nominal, and values smaller than 128 indicate a smaller gain (or larger attenuation) than nominal. The nominal value is 128. The largest range of numbers is 0 to 255. The DCE may use a more narrow range, such as 120 to 136 or 120 to 128. The value of zero is reserved for DCE Automatic Volume Control (AVC).

CAUTION! The DCE limits the transmit level over the Telco lines, regardless of the current +VGT setting, to that permitted by CFR FCC Rules Part 68,
Subpart D.

Result Code:
The DCE returns the OK result code if the DCE accepts the command. The DCE shall return the ERROR result code if the <level> subparameter is out of range

Default Mandatory
<gain> 0 or 128 0 or 128

Default Mandatory
<level> 0 or 128 0 or 128

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SAM0055-080101 5-6 AT Command Guide

+VIP
Initialize Voice Parameters
The +VIP command is used to reset all voice parameters to their factory default settings and, optionally, select a voice parameter profile.

Syntax: +VIP[=< value>]

Results:
OK if all parameters are acceptable

ERROR otherwise
If <value> is not specified, a default value of 0 will be assumed.
Table 5-2 Voice Parameter Defaults

+VIP?
This command is unacceptable and will generate and ERROR response from the DCE.

+VIP=?
Upon receiving the +VIP=? query, the DCE will display the acceptable range of parameter profiles.

AT+ VIP=?
(0)
OK

Parameter Default Acceptable Values
<value> 0 0 — Reset all voice parameters to factory default settings. See Table 5-2.

Parameter Set By Default Value
Caller ID Service Reporting AT+ VCI D 0 (Disabled)
Automatic Hangup Control AT+ VNH 0 (Disabled)
Analog Source/ Destination Selection AT+ VLS 0 (None)
Ringback Goes Away Timer AT+ VRA 50 (5 seconds)
Ringback Never Appeared Timer AT+ VRN 10 (10 seconds)
Silence Detection AT+ VSD <sensitivity> = 128 (Nominal) <timeout> = 50 (5 seconds)
Beep Tone Duration Timer AT+ VTD 100 (1 second)
Distinctive Ring AT+ VDR <enable> = 0 (Disabled) <report> = 0 (Disabled)
Event Reporting and Masking AT+ VEM FFFFFFFF8
DTE/ DCE Interface Rate AT+ VPR <rate> = 0 (Autobauding)

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+VLS=< label>
Analog Source/ Destination Selection.

This command causes the DCE to select one or more source/ destinations of the analog data.
Subparameter Description:
The DTE uses an integer, the <label> subparameter, as a label to identify each of the DCE supported analog source/ destination hardware configurations. This Interim Standard uses

Primitives to describe which voice I/ O devices (e. g., speakers) are components in a possible hardware configuration, and groups these Primitives in order to define and label sixteen common configurations.
Primitives are <string constant> s with one ASCII character code optionally followed by an ASCII number code. The Primitives, "L" and "T", cannot have number codes. This Standard equates a Primitive with a single ASCII character code, and a Primitive with an ASCII character code followed by the ASCII "O" code (20 hex). The defined Primitives are listed as follows:
Table 5-3 Codes for Voice I/ 0 Primitives

A concatenation of the Primitives describes a possible analog source/ destination hardware configuration. Table 5-4 lists sixteen commonly used hardware configurations by <label>subparameter values and the Primitive associated with each value. These parameters are used to select specific configurations.
Values after the first sixteen values are available for manufacturer-specific hardware configurations.

Default Mandatory
<label> Manufacturer-specific

Primitive Code Description L
Local Phone.
T Telco Line.

M0 Internal Microphone.
M1 External Microphone.
S0 Internal Speaker (requires squelch on any microphone activity).
S1 External Speaker (requires squelch on any microphone activity).
H0 External Microphone and Speaker combination (handset or headset).
Zn manufacturer-specific device (n>= O).
Mn manufacturer-specific extension (n>= l).
Sn manufacturer-specific extension (n>= l).
Hn manufacturer-specific extension (n>= O).

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SAM0055-080101 5-8 AT Command Guide

Table 5-4 Preassigned Voice I/ O Labels
Result Codes:
The DCE shall return the OK result code if the DCE accepts the command. The DCE shall return the ERROR result code if the <label> subparameter is out of range, or if the DCE cannot service the request in the <label> subparameter.

+VLS=?
The response form for this command is as follows:
<label>,< devices>,< transmit event>,< receive event>,< idle event>; where the <label> subparameter is a label that identifies the DCE analog source/ destination hardware configuration, the <devices> subparameter is a <string constant> (6.3. 3. 3.2.) madeup of Primitives, and the <transmit event>, the <receive event>, and the <idle event> subparameters are the DCE event reporting capabilities for the Voice Transmit Data State, Receive Data State, and the Voice Command State, respectively. Each of the event reporting subparameters is a hex number that represents an event bit field. A one in the bit field indicates that the DCE can report the associated event. The +VEM command contains additional information about event reporting.

<label> Primitive Code Description
0 None DCE on-hook. Local phone connected to Telco.
1 T DCE off-hook. DCE connected to Telco. Local phone provided with power to detect hook condition.
2 L DCE on-hook Local phone connected to DCE.
3 LT DCE off-hook. Local phone connected to Telco. DCE connected to Telco.
4 S Internal Speaker connected to DCE. DCE on-hook. Local phone connected to Telco.
5 ST Internal Speaker connected to Telco. DCE off-hook. DCE connected to Telco. Local phone provided with power to detect hook condition.
6 M Internal Microphone connected to DCE. DCE on-hook. Local phone connected to Telco.
7 MST Internal Microphone and Internal Speaker connected to Telco. Squelching active. DCE off-hook. DCE connected to Telco. Local phone provided with power to detect hook condition.
8 S1 External Speaker connected to DCE. DCE on-hook. Local phone connected to Telco.
9 S1T External Speaker connected to Telco. DCE` off-hook. DCE connected to Telco. Local phone provided with power to detect hook condition.
10 MS1T Internal Microphone and External Speaker connected to Telco. Squelching active. DCE off-hook. DCE connected to Telco. Local phone provided with power to detect hook condition.
11 M1 External Microphone connected to DCE. DCE on-hook. Local one connected to Telco.
12 M1ST External Microphone and Internal Speaker connected to Telco. Squelching active. DCE off-hook. DCE connected to Telco. Local phone provided with power to detect hook condition.
13 M1S1T External Microphone and External Speaker connected to Telco. Squelching active. DCE off-hook. DCE connected to Telco. Local phone provided with power to detect hook condition.
14 H External Microphone and Speaker combination (handset or headset) connected to DCE. DCE on-hook. Local connected to Telco.
15 HT External Microphone and Speaker combination (handset or headset) connected to DCE. DCE off-hook. DCE connected to Telco. Local phone provided with power to detect hook condition.

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Each of the possible hardware configurations has its own <label>,...,< idle event> description line (the above form description shows just one). A <CR>< LF> separates each description line from another. Note that the event reporting capability is closely tied to the description of the hardware configuration.

The DCE detectable events depend on the compression method selected by the +VSM.
Example: The following example illustrates inquiring about the DCE supported analog source/ destination hardware configurations and event detection capabilities for the selected compression method. The DCE reports that it supports only a Telco line at Service Level C. DTE originated commands and data are in bold face.

AT+ VLS=?
0,"", 088A0800,08EA0800,988A1800
1," T", 088A0800,08EA0800, 988A1800
2," L", 088A0800,08EA0800, 988A1800
3," LT", 088A0800, 08EA0800, 988A1800
OK

+VNH
Automatic Hangup Control
The +VNH handles how hang-ups are handled in non-voice modes.
Syntax: +VNH=< value>

Results:
OK issued to the DTE if the parameter is acceptable

ERROR otherwise
When <value> is 0, hanging up the phone works as it would normally in a respective service class, for both DTE initiated requests, and DCE initiated hang-ups.

When <value> is 1, DCE initiated hang-ups are suppressed. For example, in Data mode (+ FCLASS= 0), if a carrier is lost during a connection, the DCE normally will go back on-hook.
However, when +VNH= 1, this behavior is modified by not placing the DCE back on-hook. This command applies only to DCE initiated hang-ups in all non-Voice Service Classes
and is reset by the rules described below.

Parameter Default Acceptable Values
<value> 0 0 — Hang-ups work as normal in their respective Service Class.
1 — DCE initiated hang-ups are disabled for all non-voice modes.
2 — Logical hang-up: automatic hang-up is disabled but an OK result will be issued to a hang-up command in all non-voice modes.

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SAM0055-080101 5-10 AT Command Guide

A logical hang-up, performed when VNH= 2, means that the respective Service Class that requested the hang-up will get the normal OK response, signifying the DCE is on-hook.
However, the DCE will not really go on-hook, only simulate the behavior. This command applies to both DTE initiated and DCE initiated hang-ups in all non-Voice Service Classes and is reset by the rules described below.
The setting is effective immediately and is applicable across an FCLASS switch. The value will be reset when (1) +VNH= 0 is received from the DTE, (2) a +FCLASS mode change isreceived from the DTE without issuing another +VNH command, (3) a reset event occurs (such as ATZ), and (4) a +VIP command is issued.

Issuing +FCLASS= 8 while in FCLASS 8 will NOT result in a class switch and does not effect the +VNH value. This also applies to all other services: switching to the current active
service class has no effect.

Note: AT+ VNH can be issued in any Service Class.
The value of the VNH command is reset after the second FCLASS switch. For example, for responses to commands received from the DTE+ DCE:

Command AT+ VNH= 2 The DTE requests that all hang-ups be suppressed.
Response OK The DCE acknowledges the VNH value.

Command AT+ FCLASS= 0 The DCE switches to Data mode. The value of VNH is 2 at this point.
Response OK The DCE acknowledges the switch to Data mode and signifies Data mode is ready for commands.

<Operations> The DTE performs data operations such as file transfers.

Command ATH The DTE wishes to hang up the phone. Since VNH= 2, the DCE performs only a logical hang-up.
Response OK The DCE issues the OK to the DTE; however, the DCE does not go on-hook.

Command AT+ FCLASS= 1 The DTE requests a switch to Fax Class 1 mode. The value of VNH will be reset to 0 at this point.
Response OK The DCE acknowledges the Service Class switch and signifies that Fax Class 1 mode is ready for commands.

<Operations> The DTE performs a fax transfer.
Command ATH The DTE wishes to hang-up the phone. Since the VNH value was reset upon entering this mode, the phone will go on-hook.

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+VNH?
Upon receiving the +VNH? query, the DCE will display the current value of the +VNH parameter.

AT+ VNH?
0
OK

+VNH=?
Upon receiving the +VNH=? query, the DCE will display the acceptable range for the +VNH parameter.

AT+ VNH=?
0,1,2
OK

+VRX
Receive Data State

Optionally +VRX=< n>.
This command causes the DCE to start the voice reception process.
The DCE begins the voice receive mode by returning the CONNECT result code to the DTE. After this report, the DCE sends <DLE> shielded voice data to the DTE. See Table 4-5,

"Hang Up Status Codes," on page 12 for the list of possible action commands during a voice receive. The DCE shall send the voice data in the format previously selected by the +VSM command.
This Interim Standard provides for two ways to leave the Voice Receive State: (1) a <DLE><!>, and (2) a DTE/ DCE Inactivity Timer time-out. The DCE shall inform the DTE, via <DLE> codes, about pertinent events during the voice receive, such as "Presumed End of Message" (QUIET) and "Presumed Hangup" (SILENCE) detected, so that, at the discretion of the DTE. the DTE may terminate the Voice Receive State. See Table 4-4, "T. 30 Post Page Response Messages," on page 12 for a list of possible event determinations and associated ~DLE~ shielded event reports. On termination of the Voice Receive State, the DCE shall append a <DLE>< ETX> character pair (padding out to an octet boundary may be necessary), followed by the OK result code. The DCE shall return to Voice Command State.

Parameter Default Mandatory
<n> 0 0

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SAM0055-080101 5-12 AT Command Guide

The DTE/ DCE Inactivity Timer is in effect while the receive operation is in progress. If the DTE wishes to use this timer and stop the DCE from performing unwanted restarts, the
DTE must assure that there are data sent from the DTE to the DCE often enough to refresh the timer: the DTE may use the <DLE>< NUL> shielded code as a no-operation command to refresh the timer.
Subparameter Description:
<n> Rx Operation

0 Voice receive operation described above. This selection does not provide for DCE periodic tone production during a voice receive operation. WARNING: this Interim Standard
presumes that the DTE shall issue the proper notifications of a record operation in progress by message playbacks to satisfy possible legal requirements.
1 Voice receive operation described above. This selection does provide for DCE periodic tone production during a voice receive operation. The tone frequency and cadence is
manufacturer-specific.
2-127 Reserved for future standardization.
128-255 Manufacturer-specific.
Result Code:
The DCE shall return this result code if the DCE accepts the command. The DCE shall return the ERROR result code if the DCE is not connected to the off-hook Telco line, or one non-Telco input device.

+VSD
Silence Detection
The +VSD command determines the level of silence detection and reporting that the DCE shall perform. This command allows the DTE to adjust the sensitivity of the <DLE>< q> (Presumed end-of-message; QUIET) and <DLE>< s> (Presumed hang-up; SILENCE) reports.
Syntax: +VSD=< sensitivity>,< timeout>

Results:
OK is returned to the DTE for all acceptable values

ERROR otherwise
<timeout> specifies the amount of time to wait before reporting a Quite or Silence message. PN-3131 does not distinguish these two reports (other than the name). A value of 0 will completely disable reporting of these messages.

Parameter Default Acceptable Values
<sensitivity> 128 (0-127) Lower sensitivity level 128 -Nominal sensitivity level

(129-255) Higher sensitivity level
<timeout> 50 0 -disable "Presumed quiet" and "Presumed hangup" time-out messages (1 -600) -time-out in 0.1 second increments

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AT Command Guide 5-13 SAM0055-080101

+VSD?
Upon receiving the +VSD? query, the DCE will display the current values for the sensitivity and time-out value of the Silence Detection parameter.

AT+ VSD?
128, 050
OK

+VSD=?
Upon receiving the +VSD=? query, the DCE will display the acceptable ranges for both the sensitivity and time-out values.

AT+ VSD=?
(0-255),( 0-600)
OK

+VSP
AEC/ Speakerphone Control
Syntax: +VSP=< value>

Results:
OK issued to the DTE for acceptable values

ERROR otherwise
This command should be issued under FClass= 8.

+VSP?
Upon receiving the +VSP? query, the DCE will display the current value of the +VSP parameter.

AT+ VSP?
0
OK

Parameter Default Acceptable Values Description
<value> 0 0 Disable AEC
1 Enable AEC
2 Mute speakerphone

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SAM0055-080101 5-14 AT Command Guide

+VSP=?
Upon receiving the +VSP=? query, the DCE will display the acceptable range for the +VSP parameter.

AT+ VSP=?
0,1
OK

+VTD
Beep Tone Duration Timer
The +VTD command determines the length of the DTMF tones in conjunction with the +VTS command.

Syntax: +VTD=< duration>

Results:
OK issued to the DTE if the parameter is acceptable

ERROR otherwise
This command has no effect on the ATD command, only the +VTS command. A <duration> of 0 will default to the manufacturer-specific value of 100ms.

+VTD?
Upon receiving the +VTD? query, the DCE will display the current value of the beep tone duration timer.

AT+ VTD?
100
OK

+VTD=?
Upon receiving the +VTD=? query, the DCE will display the range of acceptable values for the beep tone duration timer.

AT+ VTD=?
(0-500)
OK

Parameter Default Acceptable Values
<sensitivity> 100 0 -Default of 100ms (1 -500) -Time in 0. 01 second increments

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+VTS
DTMF and Tone Generation in Voice
The +VTS command is used to play DTMF tones or other tones while in voice mode.
Syntax: +VTS=< string>

Results:
OK issued to the DTE if the parameter is acceptable

ERROR otherwise
The format of the string is a list of elements separated by commas. The elements can be:
° a single ASCII character in the set {0 -9, #, *, A -D} that will be interpreted as a DTMF tone with a length specified by the +VTD command.
° a string enclosed in square brackets ("[ ]") that will be interpreted as dual tone values and a duration in 0.01 second increments. The list will consist of up to three values. The first and second elements are tone frequencies. The final parameter is the duration. Elements may be Null. If a duration is not specified, the default duration (+ VTD) will be used. For example, [1000,2000,50] will play a 1000Hz tone and a 2000Hz tone at the same time for 500ms. [3000] or [, 3000] will play a 3000Hz tone for the default duration. [,, 50] will be interpreted as 500ms of silence.
° a string enclosed in curly braces ("{}") that will be interpreted as a DTMF tone with a duration in 0.01 second increments. {} will be interpreted as silence. If the duration is not specified, the default duration will be used (+ VTD). For example, {2,50} will play DTMF 2 for 500ms. {2} will play DTMF 2 for the default duration. {, 50} will be interpreted as 500ms of silence.
Frequencies for both ranges are 0 -3400 Hz. The duration specified in the second two formats ranges from 0-6000 (0 -60 seconds). This range matches the range of the +VTD command. Even though frequencies down to 0 are supported, not all lower frequencies will be audible on all equipment.

+VTS?
This command is unacceptable and will generate and ERROR response from the DCE.

+VTS=?
Upon receiving the +VTS query, the DCE will display a list of acceptable ranges for the first frequency, the second frequency, and the duration, respectively.

AT+ VTS=?
(200-3300),( 200-3300),( 0-500) OK

Parameter Default Acceptable Values
<string> n/ a See string definition below.

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SAM0055-080101 5-16 AT Command Guide

VTX
Voice Transmit
The +VTX causes the DCE to start the voice transmission process.
The DTE can send the <DLE> shielded voice data after the DTE receives the CONNECT result code.
When first starting the voice transmit mode, it is recommended that the DCE hold some portion of the voice data before actually transmitting the data to the analogue destination.
The DTE shall send the data in the format previously selected by the +VSM command, and use the flow control method selected by the +IFC command.

Gaps in the voice data stream from the DTE to the DCE shall not cause the DCE to terminate the voice transmit mode. It is recommended that the voice data be buffered by the DCE in such a fashion as to withstand gaps of missing data from the DTE. This recommendation does not mandate a minimum DCE transmit buffer size. If the DCE does
have any current voice data, the DCE shall send silence to the analogue destination until the DTE provides more voice data. It is recommended that the DCE hold some portion of the voice data when restarting the voice transmit before actually transmitting the data to the analogue destination.

The DTE shall signal the termination of the voice data stream by appending a <DLE>< ETX> command and padding out to an octet boundary if necessary. The DCE shall
issue the OK result code and return to the command mode after the DCE has completely transmitted the contents of its buffer. Note that, in the interim, the DTE has sent the DCE a<DLE>< ETX> command and before the DCE has responded with the OK result code, the DTE may issue a limited number of simple commands (i. e., <DLE>< CAN>).

This provides for two ways to leave the Voice Transmit State:
1. A< DLE>< ETX> shielded code
2. A DTE/ DCE Inactivity Timer time-out
Item 1 is the DTE-initiated means of terminating the Voice Transmit State. Item 2 is a DCE-initiated means of terminating the Voice Transmit State. After termination of the Data State, the DCE shall enter the Command State.
Result Code:
The DCE shall return the CONNECT result code if the DCE accepts the command. The DCE shall return the ERROR result code if the DCE is not connected to at least one off-hook Telcoline, or one nonTelco device.

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AT Command Guide 6-1 SAM0055-080101
Chapter 6

W-Class Commands

AT* Commands
*B
Display Blacklisted Number
These commands request the modem to return a list of blacklisted phone numbers to DTE. The format of the response is shown by the example below. Delayed numbers as defined by country requirements will not appear on this list. If no numbers are blacklisted, only the OK result is issued.

Example:
NO. PHONE NUMBER

1: 5553423
OK

*Cn
Data Calling tone (1300 Hz) selection
*C0 Disable 1300 Hz calling tone, so that the modem will not generate Calling tone to
the line during data mode calling.

*C1 Enable 1300 Hz calling tone, so that the modem will generate Calling tone to
the line during data mode calling.

*Dn
Display Delayed Numbers
This command causes the modem to send a list of the delayed numbers together with the delay associated with each. The format of the response is shown by the example below (delay times are shown as hours: minutes: seconds). If no numbers are delayed, only the OK result code is issued.

Example:
NO. PHONE NUMBER DELAY

1: 5557890 000: 00: 03
OK

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SAM0055-080101 6-2 AT Command Guide

*NC
Country Select
Up to seven sets of country parameters may be selected. This command checks if the entered number matches the country code of one of the countries. If found, the modem stores the location of that country in driver code. Upon power up or a soft reset (Z command), the modem uses this location to load the parameters for the corresponding country.

*NCn
Select country parameter corresponding to entered country code (n).

Table 6-1: Country Codes Code (n) Country Code (n) Country Code (n) Country

0 United States 25 Greece 50 India
1 Japan 26 Iceland 51 Indonisia
2 Germany 27 Netherlands 52 Chile
3 United Kingdom 28 Luxembourg 53 Macau
4 France 29 Norway 54 Brunai
5 Netherlands 30 CTR21 55 Phillipines
6 Italy 31 Portugal 56 Cyprus
7 Australia 32 Slovenia 57 Liechtenstain
8 Sweden 33 Switzerland 58 Malta
9 Denmark 34 Thailand 59 Slovakia
10 New Zealand 35 Peru 60 Colombia
11 Korea 36 Israel 61 Guatamala
12 China 37 Bulgaria 62 Puerto Rico
13 Singapore 38 Argentina 63 Venezuel a
14 Malaysia 39 Mexico 64 Bolivia
15 South Africa 40 Tai wan 65 Ecuador
16 Poland 41 Brazil 66 Pakistan
17 Czechoslovakia 42 Ireland 67 Panama
18 Hungary 43 Russia 68 Vietnam
19 Hong Kong 44 Kuwait 69 El Salvador
20 Turkey 45 Saudi Arabia 70 Honduras
21 Spain 46 Egypt 71 Dominican Republic
22 UAE 47 Tunisia 72 Paraguay
23 Belgium 48 Morocco 73 Uruguay
24 Finland 49 Bahrain 74 Haiti

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PTT Testing Utilities
AT Command Guide 6-3 SAM0055-080101

*Sn
Select Single/ Dual Tone
This command causes the modem to produce either single or dual tone with using an %TTn, command, where n can be 0 to 9 or A to F.

*S0 Regular dual tone transmitted to the line.
*S1 The low band tone transmitted to the line.
*S2 The high band tone transmitted to the line.
Result:
OK n = 0, 1, 2

PTT Testing Utilities
%Tn
PTT Testing of Signal Level
Facilitates PTT testing of signal levels by providing continuous signals regardless of whether the modem is connected or not. The signal transmitted is in accordance with the parameter provided.
This is a range of commands that allow the user to initiate a series of signals that are necessary for PTT approval. The signals emitted include answer tone, modulation, carriers, and other pertinent signals. A test is initiated upon receipt of a %TTn (the second "T" is a password and the "n" is a test number); the test is aborted when any keyboard character is entered. The mode will continuously transmit the tone or carrier according to the parameter supplied.

%TT00–% TT09 Dual Tone Multifrequency (DTMF) tone dial digits 0 to 9
%TT0A DTMF digit *
%TT0B DTMF digit #
%TT0C DTMF digit A
%TT0D DTMF digit B
%TT0E DTMF digit C
%TT0F DTMF digit D
%TT10 V. 21 Channel 1 mark (originate) symbol
%TT11 V. 21 Channel 2 mark symbol
%TT15 V. 22 originate signaling at 1200 bps
%TT16 V. 22 bis originate signaling at 2400 bps
%TT17 V. 22 answer signaling (guard tone if PTT required)

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PTT Testing Utilities
SAM0055-080101 6-4 AT Command Guide

%TT18 V. 22 bis answer signaling (guard tone if PTT required)
%TT19 V. 21 Channel 1 space symbol
%TT1A V. 21 Channel 2 space symbol
%TT20 V. 32 9600 bps
%TT21 V. 32 bis 14400 bps
%TT30 Silence, i. e., go off-hook
%TT31 V. 25 answer tone
%TT32 1800 Hz guard tone
%TT33 V. 25 calling tone (1300 Hz)
%TT34 Fax calling tone (1100 Hz)
%TT40 V. 21 channel 2
%TT41 V. 27 ter 2400 bps
%TT42 V. 27 ter 2400 bps
%TT43 V. 29 7200 bps
%TT44 V. 29 9600 bps
%TT45 V. 17 7200 bps long train
%TT46 V. 17 7200 bps short train
%TT47 V. 17 9600 bps long train
%TT48 V. 17 9600 bps short train
%TT49 V. 17 12000 bps long train
%TT4A V. 17 12000 bps short train
%TT4B V. 17 14400 bps long train
%TT4C V. 17 14400 bps short train
%TT60 2400 bps (V. 34 only)
%TT61 4800 bps (V. 34 only)
%TT62 7200 bps (V. 34 only)
%TT63 9600 bps (V. 34 only)
%TT64 12000 bps (V. 34 only)
%TT65 14400 bps
%TT66 16800 bps
%TT67 19200 bps
%TT68 21600 bps
%TT69 24000 bps
%TT6A 26400 bps
%TT6B 28800 bps
%TT6C 31200 bps
%TT6D 33600 bps

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