Multi-Tech Systems V.92, V.34 User Manual

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SocketModem™

MT5634SMI V.34 & V.92

AT Commands

Fax Class 1 Commands

Fax Class 2 Commands

Voice Commands

Reference Guide

SocketModem Reference Guide

Serial: MT5634SMI-34, MT5634SMI-92 Parallel: MT5634SMI-P-92 Medical Device: MT5634SMI-HV-92, MT5634SMI-P-HV-92 Industrial Temperature: MT5634SMI-ITP-92, MT5634SMI-P-ITP-92

PN S000263C, Version C Copyright

This publication may not be reproduced, in whole or in part, without prior expres sed written permission from Multi-Tech Systems, Inc. All rights reserved. Copyright © 2003-4, by Multi-Tech Systems, Inc. Multi-Tech Systems, Inc. makes no represent ations or warranties with respect to the contents hereof and specifically disclaim any implied warranties of merchantability or fitness for any particular purpose. Furthermore, Multi-Tech Systems, Inc. reserves the right to revise this publication and to make changes from time to time in the content hereof without obligation of Multi-Tech Systems, Inc. to notify any person or organization of such revisions or changes.

Revisions

Revision Level Date Description

A 08/09/02 First release. Includes global configuration and V.92 protocol. B 06/27/03 Add V.34 documentation. Updated the Serial Test/Demo Board graphic.

Updated the parts list. Updated Flash Programming Protocol. Updated Telecom Approvals and Country Codes. Changed the product name from ModemModule to SocketModem.

C 06/04/04 Create a separate Universal Socket Hardware guide and a separate AT

Command Reference Guide.

Trademarks

Trademarks of Multi-Tech Systems, Inc. are SocketModem and the Multi-Tech logo. Microsoft and Microsoft Windows are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries.

World Headquarters

Multi-Tech Systems, Inc. 2205 Woodale Drive Mounds View, MN 55112 Phone: 763-785-3500 or 800-328-9717 Fax: 763-785-9874

Technical Support Country By Email By Phone

France: support@multitech.fr (33) 1-64 61 09 81 India: support@multitechindia.com 91 (124) 6340778 U.K.: support@multitech.co.uk (44) 118 959 7774 U.S. and Canada: oemsales@multitech.com (800) 972-2439 Rest of the World: oemsales@multitech.com (763) 717-5863 Internet Address: http://www.multitech.com

Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C) 2

Table of Contents

Contents

Chapter 1 – AT Commands, S-Registers and Result Codes ..................................................................5

Introduction................................................................................................................................................5

AT Command Summary ............................................................................................................................6

AT Commands...........................................................................................................................................8

Escape AT Commands............................................................................................................................21

V.92 Commands......................................................................................................................................22

S-Registers..............................................................................................................................................28

Result Codes ...........................................................................................................................................31

Chapter 2 – Fax Class 1 and Class 1.0 Commands...............................................................................33

Fax I/O Processing ..................................................................................................................................33

DTE-to-Modem Transmit Data Stream ...............................................................................................33

Modem-to-DTE Receive Data Stream ................................................................................................33

Fax Mode Selection.............................................................................................................................34

Fax Origination....................................................................................................................................34

Fax Answering.....................................................................................................................................34

Fax Control Transmission ...................................................................................................................34

Fax Control Reception.........................................................................................................................35

Fax Data Transmission .......................................................................................................................36

Fax Data Reception.............................................................................................................................36

Commands and Parameters....................................................................................................................37

Mode Entry Commands.......................................................................................................................37

Mode Commands................................................................................................................................37

Service Class 1 Commands ....................................................................................................................41

Examples.................................................................................................................................................45

Chapter 3 – Fax Class 2 and 2.0/2.1 Commands ...................................................................................48

Introduction..............................................................................................................................................48

AT Command Implementation.................................................................................................................49

Modes of Interaction ................................................................................................................................50

AT Command Mode............................................................................................................................50

Command Execution Mode.................................................................................................................52

Data Transfer Mode ............................................................................................................................52

Commands and Responses Overview ....................................................................................................55

Action Commands...............................................................................................................................55

Modem Responses .............................................................................................................................56

Parameters for Mandatory Services....................................................................................................57

Parameters for Optional Services.......................................................................................................58

Identification Commands.........................................................................................................................59

Service Class Indication......................................................................................................................59

Service Class Capabilities...................................................................................................................59

Service Class Selection.......................................................................................................................60

Request Manufacturer Identification ...................................................................................................60

Request Model Identification...............................................................................................................60

Request Revision Identification...........................................................................................................60

Action Commands....................................................................................................................................61

Originate a Call....................................................................................................................................61

Answer a Call ......................................................................................................................................61

Data Transmission ..............................................................................................................................62

Post-Page Message Release..............................................................................................................62

Data Reception....................................................................................................................................63

Session Termination............................................................................................................................63

Initialize Facsimile Parameters ...........................................................................................................63

Modem Responses..................................................................................................................................64

T.30 Phase A Negotiation Responses................................................................................................64

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Table of Contents

T.30 Phase B Negotiation Responses................................................................................................65

T.30 Phase C Page Reception Responses.........................................................................................68

T.30 Phase D Post Page Responses..................................................................................................69

Call Termination with Status................................................................................................................69

Parameter Commands.............................................................................................................................72

T.30 Session Parameters....................................................................................................................72

T.30 Procedure Control Parameters...................................................................................................82

Phase C Data Format Parameters......................................................................................................87

Miscellaneous Parameters..................................................................................................................92

Session Message Report Responses......................................................................................................93

Sample Modem Control Sessions ...........................................................................................................94

Send two pages, 1-D data, no errors (Class 2)...................................................................................94

Receive two pages, 1-D data, no errors (Class 2)..............................................................................95

Send two pages, 1-D data, no errors (Class 2.0)................................................................................96

Receive two pages, 1-D data, no errors (Class 2.0)...........................................................................97

Originate and send a two page facsimile with V.34 half-duplex (Class 2.1).......................................98

Answer and receive a two-page facsimile with V.34 half-duplex (Class 2.1)......................................99

Alphabetic List of Commands and Responses......................................................................................100

ASCII Conversion Chart.........................................................................................................................102

Chapter 4 – Voice Commands ...............................................................................................................103

Introduction............................................................................................................................................103

Voice S-Register Summary ...................................................................................................................104

Voice Commands...................................................................................................................................104

Commands That Change for Voice Mode Support................................................................................104

Voice +V Commands Summary.............................................................................................................105

Voice +V Commands Detail...................................................................................................................105

Interface Configuration Commands.......................................................................................................119

Flow Control...........................................................................................................................................121

Voice Mode Result Codes .....................................................................................................................121

Unsolicited Voice Mode Result Codes...................................................................................................122

Valid Complex Event Report Tags....................................................................................................122

Voice Mode Shielded Codes .................................................................................................................123

Sample Sessions...................................................................................................................................125

Sample Rate Selection and Suggested Compression Method.........................................................125

Answer Phone, Play Greeting Message, and Record Message Example........................................126

DTE/DCE Interface Rates......................................................................................................................128

Chapter 5 – Remote Configuration and Country Code Configuration ..............................................129

Remote Configuration............................................................................................................................129

Basic Procedure................................................................................................................................129

Setup.................................................................................................................................................129

Country Code Configuration ..................................................................................................................130

Using the Global Wizard Utility..........................................................................................................130

Using AT Commands........................................................................................................................130

Index.........................................................................................................................................................131

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Chapter 1 – AT Commands, S-Registers and Result Codes

Chapter 1 – AT Commands, S-

Registers and Result Codes

Introduction

The AT commands are used to control the operation of your modem. They are called AT commands because the characters AT must precede each command to get the ATtention of the modem.

AT commands can be issued only when the modem is in command mode or online command mode.

• The modem is in command mode whenever it is not connected to another modem.

• The modem is in data mode whenever it is connected to another modem and ready to exchange

data. Online command mode is a temporary state in which you can issue commands to the modem while connected to another modem.

• To put the modem into online command mode from data mode, you must issue an escape

sequence (+++) followed immediately by the AT characters and the comm and, e.g., +++ATH to

hang up the modem. To return to data mode from online command mode, you must issue the command ATO.

To send AT commands to the modem you must use a communications program, such as the HyperTerminal applet in Windows 98 and NT 4.0, or some other available terminal program. You can issue commands to the modem either directly, by typing them in the terminal window of the communications program, or indirectly, by configuring the operating system or communications program to send the commands automatically. Fortunately, communications programs make daily operation of modems effortless by hiding the commands from the user. Most users, therefore, need to use AT commands only when reconfiguring the modem, e.g., to turn auto answer on or off.

The format for entering an AT command is ATXn, where X is the command and n is the specific value for the command, sometimes called the command parameter. The value is always a number. If the value is zero, you can omit it from the command; thus, AT&W is equivalent to AT&W0. Most commands have a default value, which is the value that is set at the factory. The default values are shown in the “AT Command Summary” (See below).

You must press ENTER (it could be some other key depending on the terminal program) to send the command to the modem. Any time the modem receives a command, it sends a response known as a result code. The most common result codes are OK, ERROR, and the CONNECT messag es that the modem sends to the computer when it is connecting to another modem. See a table of valid result codes at the end of this chapter.

You can issue several commands in one line, in what is called a command string. The command string begins with AT and ends when you press ENTER. Spaces to separate the commands are optional; the command interpreter ignores them. The most familiar command string is the initialization string, which is used to configure the modem when it is turned on or reset, or when your communications software calls another modem.

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Chapter 1 – AT Commands, S-Registers and Result Codes

AT Command Summary

Organization of AT Commands on the following pages: 1st, by the initial command character (&, +, %) 2nd, alphabetized by the second command character (Except for listing of AT).

Command Description

AT A A/ Bn Ds DS=y En Fn Hn In Mn Nn On P Qn Sr=n Sr? T Vn Wn Xn Zn &Cn &Dn &En &Fn &Gn &Kn &Ln &Pn &Qn &Sn &Tn &V &Wn &Zy=x \An \Bn \Kn \Nn \Qn \Tn \Vn

-Cn %A %B %Cn %DCn %En %Hn %Rn %Sn $EBn

Attention Code Answer Repeat Last Command Communication Standard Setting Dial Dial Stored Telephone Number Echo Command Mode Characters Echo Online Data Characters Hook Control Information Request Monitor Speaker Mode Modulation Handshake Return Online to Data Mode Pulse Dialing Result Codes Enable/Disable Set Register Value Read Register Value Tone Dialing Result Code Format Result Code Options Result Code Selection Modem Reset Data Carrier Detect (DCD) Control Data Terminal Ready (DTR) Control XON/XOFF Pass-Through Load Factory Settings V.22bis Guard Tone Control Flow Control Selection Leased Line Operation Pulse Dial Make-to-Break Ratio Selection Asynchronous Communications Mode Data Set Ready (DSR) Control Loopback Test (V.54 Test) Commands Display Current Settings Store Current Configuration Store Dialing Command Select Maximum MNP Block Size Transmit Break Break Control Error Correction Mode Selection Flow Control Selection Inactivity Timer Protocol Result Code Data Calling Tone Adaptive Answer Result Code Enable View Numbers in Blacklist Data Compression Control AT Command Control Fallback and Fall Forward Control Direct Connect Enable Cisco Configuration Command Speed Response Asynchronous Word Length

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Chapter 1 – AT Commands, S-Registers and Result Codes

Command Description

$Dn $MBn $SBn #CBAn #CBDn # CBF? # CBFR # CBIn # CBNy=n # CBPn # CBRy # CBSn #Pn #Sx #S=x +VDR=x, y +++AT<CR> %%%ATMTSMODEM<CR> V.92 Commands

DTR Dialing Online BPS Speed Serial Port Baud Rate Callback Attempts Callback Delay Callback Failed Attempts Display Callback Failed Attempts Reset Local Callback Inactivity Timer Store Callback Password Callback Parity Callback Security Reset Callback Enable/Disable Set 11-bit Parity Enter Setup Password Store Setup Password Distinctive Ring Report Escape Sequence Remote Configuration Escape Sequence

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Chapter 1 – AT Commands, S-Registers and Result Codes

AT Commands

Command: AT Attention Code

Values: N/A Description: The attention code precedes all command lines except A/, A: and escape

sequences.

Command: ENTER Key

Values: N/A Description: Press the E

Command: A Answer

Values: N/A Description: Answer call before final ring.

Command: A/ Repeat Last Command

Values: N/A Description: Repeat the last comm and string. Do not precede this command with AT. Do not

press E

Command: Bn Communication Standard Setting

Values: n = 0–3, 15, 16 Default: 0 and 15 Description: B0 Select ITU-T V.22 mode when modem is at 1200 bps. B1 Select Bell 212A when modem is at 1200 bps. B2 Deselect V.23 reverse channel (same as B3). B3 Deselect V.23 reverse channel (same as B2). B15 Select V.21 when the modem is at 300 bps. B16 Select Bell 103J when the modem is at 300 bps.

NTER (RETURN) key to execute most commands.

NTER to execute.

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Chapter 1 – AT Commands, S-Registers and Result Codes

Command: Ds Dial

Values: s = dial string (phone number and dial modifiers) Default: none Description: Dial telephone number s, where s may up to 40 characters long and include the 0–

9, *, #, , B, C, and D characters, and the L, P, T, V, W, S, comma (,), semicolon (;), !, @, ^ and $ dial string modifiers.

Dial string modifiers: L Redial last number. (Must be placed immediately after ATD.) P Pulse-dial following numbers in command. T Tone-dial following numbers in comm and (default). V Switch to speakerphone mode and dial the following number. Use ATH

command to hang up.

W Wait for a new dial tone before continuing to dial. (X2, X4, X5, X6, or X7 must

be selected.)

, Pause during dialing for time set in register S8. ; Return to command mode after dialing. (Place at end of dial string.) ! Hook flash. Causes the modem to go on-hook for one-half second, then off-

hook again.

@ Wait for quiet answer. Causes modem to wait for a ringback, then 5 seconds

of silence, before processing next part of command. If silence is not detected, the modem returns a NO ANSWER code.

^ Disable data calling tone transmission. $ Detect AT&T call card “bong” tone. The character should follow the phone

number and precede the user’s call card number:

ATDT1028806127853500$

123456789

Command: DS=y Dial Stored Telephone Number

Values: n = 0–2 (0–1 for SMI-Parallel {internal}) Default: none Description: Dial a number previousl y stored in directory number y by the &Zy=x command.

Example: ATDS=2

Command: En Echo Command Mode Characters

Values: n = 0 or 1 Default: 1 Description: E0 Do not echo keyboard input to the terminal. E1 Do echo keyboard input to the terminal.

Command: Fn Echo Online Data Characters

Values: n = 1 Default: 1 F0 Enable online data character echo. (Not supported.) F1 Disable online data character echo (included for backward compatibility with

some software).

Command: Hn Hook Control

Values: n = 0 or 1 Default: 0 Description: H0 Go on-hook (hang up). H1 Go off-hook (make the phone line busy).

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Chapter 1 – AT Commands, S-Registers and Result Codes

Command: In Information Request

Values: n = 0–5, 9, 11 Default: None Description: I0 Display default speed and controller firmware version. I1 Calculate and display ROM checksum (e.g., 12AB). I2 Check ROM and verify the checksum, displaying OK or ERROR. I3 Display default speed and controller firmware version. I4 Display firmware version for data pump (e.g., 94). I5 Display the board ID: software version, hard wa re version, an d country ID I9 Display the country code (e.g., NA Ver. 1). I11 Display diagnostic information for the last modem connection, such as DSP

and firmware version, link type, line speed, serial speed, type of error correction/data compression, number of past retrains, etc.

Command: Mn Monitor Speaker Mode

Values: n = 0, 1, 2, or 3 Default: 1 Description: M0 Speaker always off. M1 Speaker on until carrier signal detected. M2 Speaker always on when modem is off-hook. M3 Speaker on until carrier is detected, except while dialing.

Command: Nn Modulation Handshake

Values: n = 0 or 1 Default: 1 Description: N0 Modem performs handshake only at communication standard specified by

S37 and the B command.

N1 Modem begins handshake at communication standard specified by S37 and

the B command. During handshake, fallback to a lower speed can occur.

Command: On Return Online to Data Mode

Values: 0, 1, 3 Default: None Description: O0 Exit online command mode and return to data mode (see +++AT<CR>

escape sequence). O1 Issue a retrain and return t o online data mode. O3 Issue a rate renegotiations and return to data mode.

Command: P Pulse Dialing

Values: P, T Default: T Description: Configures the modem for pulse (non-touch-tone) dialing. Dialed digits are pulsed

until a T command or dial modifier is received.

Command: Qn Result Codes Enable/Disable

Values: n = 0 or 1 Default: 0 Description: Q0 Enable result codes. Q1 Disable result codes. Q2 Returns an OK for backward compatibility with some software.

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Chapter 1 – AT Commands, S-Registers and Result Codes

Command: Sr=n Set Register Value

Values: r = S-register number; n varies Default: None Description: Set value of register Sr to value of n, where n is entered in decimal format (e.g.,

S0=1).

Command: Sr? Read Register Value

Values: r = S-register number Default: None Description: Read value of register Sr and display it in 3-digit decimal form (e.g., S2? gives the

response 043).

Command: T Tone Dialing

Values: P, T Default: T Description: Configures the modem for DTMF (touch-tone) dialing. Dialed digits are tone dialed

until a P command or dial modifier is received.

Command: Vn Result Code Format

Values: n = 0 or 1 Default: 1 Description: V0 Displays result codes as digits (terse response). V1 Displays resu lt codes as words (verbose response).

Command: Wn Result Code Options

Values: n = 0, 1, or 2 Default: 2 Description: W0 CONNECT result code reports serial port speed, disables protocol result

codes. W1 CONNECT result code reports serial port speed, enables protocol result

codes. W2 CONNECT result code reports line speed, enables protocol result codes.

Command: Xn Result Code Selection

Values: n = 0–7 Default: 4 Description: X0 Basic result codes (CONNECT); does not look for dial tone or busy signal. X1 Extended result codes (CONNECT 46000 V42bis); does not look for dial tone

or busy signal. X2 Extended result codes with NO DIALTONE; does not look for busy signal. X3 Extended result codes with BUSY; does not look fo r dial tone. X4 Extended result codes with NO DIALTONE and BUSY. X5 Extended result codes with NO DIALTONE and BUSY. X6 Extended result codes with NO DIALTONE and BUSY. X7 Basic result codes with NO DIALTONE and BUSY.

Command: Zn Modem Reset

Values: n = 0 or 1 Default: None Description: Z0 Re set modem to profile saved by the last &W command. Z1 Same as Z0.

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Chapter 1 – AT Commands, S-Registers and Result Codes

Command: &Cn Data Ca rri er Detect (DCD) Control

Values: n = 0, 1, 2 Default: 1 Description: &C0 Forces the DCD circuit to be always ON. &C1 DCD goes ON when the remote modem’s carrier signal is detected, and

goes OFF when the carrier signal is not detected.

&C2 DCD turns OFF upon disconnect for time set by S18. It then goes high again

(for some PBX phone systems).

Command: &Dn Data Terminal Ready (DTR) Control

Values: n = 0, 1, 2, or 3 Default: 2 Description: &D0 Modem ignores true status of DTR signal and responds as if it is always on. &D1 If DTR drops while in online data mode, the modem enters command mode,

issues an OK, and remains connected.

&D2 If DTR drops while in online data mode, the modem hangs up. If the signal is

not present, the modem will not answer or dial.

&D3 If DTR drops, modem hangs up and resets as if ATZ command were issued.

Command: &En XON/XOFF Pacing Control

Values: n = 12 or 13 Default: 12 Description: &E12 Disables XON/XOFF pacing. &E13 Enables XON/XOFF pacing.

Command: &Fn Load Factory Settings

Values: n = 0 Default: None Description: &F0 Load factory settings as active configuration.

Note: See also the Z command.

Command: &Gn V.22bis Guard Tone Control

Values: n = 0, 1, or 2 Default: 0 Description: &G0 Disable guard tone. &G1 Set guard tone to 550 Hz. &G2 Set guard tone to 1800 Hz.

Note: The &G command is not used in North America.

Command: &Kn Flow Control Selection

Values: n = 0, 3, or 4 Defaults: 3 Description: &K0 Disable flow control. &K3 Enable CTS/RTS hardware flow control. &K4 Enable XON/XOFF software flow control.

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Chapter 1 – AT Commands, S-Registers and Result Codes

Command: &Ln Leased Line Operation

Values: n = 0, 1, or 2 Defaults: 0 Description: &L0 The modem is set for standard dial-up operation. &L1 The modem is set for leased line operation in originate mode. &L2 The modem is set for leased line operation in answer mode.

Note: For &L1 and &L2, there is a 30-second window between power up and the

starting of the leased line handshake. During this time, you can turn off the command, if desired.

Command: &Pn Pulse Dial Make-to-Break Ratio Selection

Values: n = 0, 1, or 2 Default: 0 Description: &P0 60/40 make-to-break ratio &P1 67/33 make-to-break ratio &P2 20 pulses per second

Note: The &P2 command is available only if the country code is set to Japan.

Command: &Qn Asynchronous Communications Mode

Values: n = 0, 5, 6, 8, or 9 Default: 5 Description: &Q0 Asynchronous with data buffering. Same as \N0. &Q5 Error control with data buffering. Same as \N3. &Q6 Asynchronous with data buffering. Same as \N0. &Q8 MNP error control mode. If MNP error control is not established, the modem

falls back according to the setting in S36.

&Q9 V.42 or MNP error control mode. If neither error control is established, the

modem falls back according to the setting in S36.

Command: &Sn Data Set Ready (DSR) Control

Values: n = 0 or 1 Default: 0 Description: &S0 DSR is always ON. &S1 DSR goes ON only during a connection.

Command: &Tn Loopback Test (V.54 Test) Commands Values: n = 0, 1, 3, 6

Default: None Description: The modem can perform selected test and diagnostic functions. A test can be run

only when the modem is operating in non-error-correction mode (normal or direct mode). For tests 3 and 6, a connection between the two modems must be established. To terminate a test in progress, the escape sequence (+++AT) must

be entered. &T0 Stops any test in progress. &T1 Starts a local analog loopback, V.54 Loop 3, test. If a connection exists when

this command is issued, the modem hangs up. When the test starts, a CONNECT message is displayed.

&T3 Starts local digital loopback, V.54 Loop 2, test. If no connection exists,

ERROR is returned.

&T6 Initiates a remote digital loopback, V.54 Loop 2, test without self-test. If no

connection exists, ERROR is returned.

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Chapter 1 – AT Commands, S-Registers and Result Codes

Command: &V Display Current Settings

Values: N/A Description: Displays the active modem settings.

Command: &Wn Store Current Configuration

Values: n = 0 or 1 Default: 1 Description: &W0 Stores current modem settings in non-volatile memory and causes them to

be loaded at power-on or following the ATZ command instead of the factory defaults. See &F command.

&W1 Clears user default settings from non-volatile memory and causes the

factory defaults to be loaded at power-on or following the ATZ command.

Command: &Zy=x Store Dialing Command

Values: y = 0–2 (0–1SMI-Parallel {internal}) x = Dialing command Default: None Description: Stores dialing command x in memory location y. Dial the stored number using the

command ATDS=y. See Also the #CBS command, a callback security command.

Command: \An Select Maximum MNP Block Size

Values: n = 0, 1, 2, or 3 Default: 3 Description: \A0 64-character maximum \A1 128-character maximum \A2 192-character maximum \A3 256-character maximum

Command: \Bn Transmit Break

Values: n = 0–9 in 100 ms units Default: 3 Description: In non-error-correction mode only, sends a break signal of the specified length to a

remote modem. Works in conjunction with the \K command.

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Chapter 1 – AT Commands, S-Registers and Result Codes

Command: \Kn Break Control

Values: n = 0–5 Default: 5 Description: Controls the modem 's response to a break received from: computer, remote

modem, or \B command. Response is different for each of three different states. Data mode. Modem receives the break from the computer: \K0 Enter online command mode, no break sent to the remote modem. \K1 Clear data buffers and send break to the remote modem. \K2 Same as \K0. \K3 Send break immediately to the remote modem. \K4 Same as \K0. \K5 Send break to the remote modem in sequence with the transmitted data. Data mode. Modem receives the break from the remote modem: \K0 Clear data buffers and send break to the computer. \K1 Same as \K0. \K2 Send break immediately to the computer. \K3 Same as \K2. \K4 Send break to the computer in sequence with the received data. \K5 Same as \K4. Online command mode. Modem receives a \Bn command from the computer: \K0 Clear data buffers and send break to the remote modem. \K1 Same as \K0. \K2 Send break immediately to the remote modem. \K3 Same as \K2. \K4 Send break to the remote modem in sequence with the transmitted data. \K5 Same as \K4.

Command: \Nn Error Correction Mode Selection

Values: n = 0–5, or 7 Default: 3 Description: \N0 Non-error correction mode with data buffering (buffer mode; same as &Q6). \N1 Direct mode. \N2 MNP reliable mode. If the modem cannot make an MNP connection, it

disconnects.

\N3 V.42/MNP auto-reliable mode. The modem attempts first to connect in V.42

error correction mode, then in MNP mode, and finally in non-error correction (buffer) mode with continued operation.

\N4 V.42 reliable mode. If the modem cannot make a V.42 connection, it

disconnects. \N5 V.42, MNP, or non-error correction (same as \ N3). \N7 V.42, MNP, or non-error correction (same as \ N3).

Command: \Qn Flow Control Selection

Values: n = 0, 1, or 3 Default: 3 Description: \Q0 Disable flow control (same as &K0). \Q1 XON/XOFF software flow control (same as &K4). \Q2 CTS-only flow control. Not supporte d. \Q3 RTS/CTS hardware flow control (same as &K3).

Command: \Tn Inactivity Timer

Values: n = 0, 1–255 Default: 0 Description: Sets the time (in minutes) after the last character is sent or received that the

modem waits before disconnecting. A value of zero disables the timer. Applies only in buffer mode.

Note: You can also set the inactivity timer by changing the value of S30.

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Chapter 1 – AT Commands, S-Registers and Result Codes

Command: \Vn Protocol Result Code

Values: n = 0, 1, or 2 Default: 1 Description: \V0 Disables the appending of the protocol result code to the DCE speed. \V1 Enables the appending of the protocol result code to the DCE speed. \V2 Same as \V1.

Command: \Xn XON/XOFF Pass-Through

Values: n = 0 or 1 Default: 0 Description: \X0 Modem responds to and discards XON/XOFF charac ters. \X1 Modem responds to and passes XON/XOFF characters. Note: This is also controlled via &E6 and &E7.

Command: -Cn Data Calling Tone

Values: n = 0 or 1 Defaults: 1 Description: -C0 Disable V.25 data calling tone to deny remote data/fax/voice discrimination.

-C1 Enable V.25 data calling tone to allow remote data/fax/voice discrimination.

Command: %A Adaptive Answer Result Code Enable

Values: n = 0 or 1 Default: 0 Description: The %A command control s wh ether the DATA or FAX result codes will be sent by

the modem. The modem must be in fax mode for this command to work. Also, the modem must be set to +FAA=1, which enables the modem to distinguish between a fax and a data call. When these commands are enabled, the modem sends DATA to the computer when it detects data tones and FAX when it detects fax tones. These strings are used by some servers to select the appropriate

communication program. %A0 Disables adaptive answer result codes. %A1 Enables adaptive answer result codes.

Command: %B View Numbers in Blacklist

Values: N/A Description: If blacklisting is in effect, AT%B displays the numbers for whi ch the last call

attempted in the previous two hours failed. In countries that do not require

blacklisting, the ERROR result code appears.

Command: %Cn Data Compression Control

Values: n = 0 or 1 Default: 1 Description: %C0 Disable V.42bis/MNP 5 data compression. %C1 Enable V.42bis/MNP 5 data compression.

Command: %DCn AT Command Control

Values: n = 0 or 1 Default: 0 Description: %DC0 The modem responds to AT commands. %DC1 The modem ignores AT commands.

Note: The modem will respond to AT%DC for 10 seconds after power-up.

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Chapter 1 – AT Commands, S-Registers and Result Codes

Command: %En Fallback and Fall Forward Control

Values: n = 0, 1, or 2 Default: 2 Description: %E0 Disable fallback and fall forward. %E1 Enable fallback, disable fall forward. %E2 Enable fallback and fall forward.

Command: %Hn Direct Connect Enable

Values: n = 0, 1 Default: 0 Description: %H0 Sets callback security to normal operation. %H1 All callback security calls will be direct connect regardless of whether the

password or phone number has the - character.

Command: %Rn Cisco Configuration

Values: n = 0, 1 Default: 0 Description: %R0 Disables Cisco configuration. %R1 Sets E0, Q1, &D0, \N0, $SB9600, and %S1 for operation with a Cisco

router.

Command: %Sn Command Speed Response

Values: n = 0, 1 Default: 0 Description: %S0 Sets modem to respond to AT commands at all normal speeds. %S1 AT commands accepted at 115200 bps only. Commands at other speeds

are ignored.

Command: $Dn DTR Dialing

Values: n = 0 or 1 Default: 0 Description: $D0 Disables DTR dialing. $D1 Dials the number in memory location 0 when DTR goes high.

Command: $EBn Asynchronous Word Length

Values: n = 0 or 1 Default: 0 Description: $EB0 Enables 10-bit mode. $EB1 Enables 11-bit mode.

Command: $MBn Online BPS Speed

Values: n = speed in bits per second Default: 28,800 Description: $MB75 Selects CCITT V.23 mode $MB300 Selects 300 bps on-line $MB1200 Selects 1200 bps on-line $MB2400 Selects 2400 bps on-line $MB4800 Selects 4800 bps on-line $MB9600 Selects 9600 bps on-line $MB14400 Selects 14400 bps on-line $MB19200 Selects 19200 bps on-line $MB28800 Selects 28800 bps on-line $MB33600 Selects 33600 bps on-line

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Chapter 1 – AT Commands, S-Registers and Result Codes

Command: $RPn Ring Priority vs. AT Command Priority

Values: n = 0 or 1 Default: 1 Description: $RP0 The AT command will have priority over the ring. S1 will be reset to 0

if an AT command is received. This command is storable to memory.

$RP1 The ring will have priority over the AT command. S1 will increment

even if an AT command and ring are received together and the incoming call will be answered when S1 is equal to S0.

Note: SocketModems do not detect ring cadence of TelTone teleph one

line simulators as a valid ring.

Command: $SBn Serial Port Baud Rate

Values: n= speed in bits per se cond Default: 57600

Description: $SB300 Sets serial port to 300 bps

$SB1200 Sets serial po rt to 1200 bps

$SB2400 Sets serial po rt to 2400 bps $SB4800 Sets serial po rt to 4800 bps $SB9600 Sets serial po rt to 9600 bps $SB19200 Sets serial port to 19200 bps $SB38400 Sets serial port to 38400 bps $SB57600 Sets serial port to 57600 bps $SB115200 Sets serial port to 115200 bps $SB230400 Sets serial port to 230400 bps

Command: +VDR=x, y Distinctive Ring Report

Values: x = 0, 1 Distinctive Ring report control. See description. y = 0–255 Minimum ring interval in 100 ms units. See description. Default: 0, 0 Description: Enables reporting of ring cadence information to the DTE and specifies the

minimum ring cadence that will be reported.

The report format is one line per silence period and one line per ring period.

The length of the silence period is in the form DROF=number in units of 100 ms<CR><LF>, and the length of the ring is in the form DRON=number in units of 100 ms<CR> <LF>. The modem may produce a Ring event code after the DRON message if enabled by the y parameter. The y parameter must be set to a value equal to or smaller than the expected ring cadence in

order to pass the report to the DTE. +VDR=0, N/A Disables Distinctive Ring cadence reporting. +VDR=1, 0 Enables Distinctive Ring cadence reporting. Other call

progress result codes (including RING) are reported as normal.

+VDR=1, >0 Enables Distinctive Ring cadence reporting. The RING result

code is reported after the falling edge of the ring pulse (i.e.,

after the DRON report). +VDR=? Displays the allowed values. +VDR? Displays the current value.

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Chapter 1 – AT Commands, S-Registers and Result Codes

Command: #CBAn Callback Attempts

Values: n = 1–255 Default: 4 Description: Sets the number of callback attempts that are allowed after passwords have

been exchanged between modems.

Command: #CBDn Callback Delay

Values: n = 0–255 Default: 15 Description: Sets the length of time (in seconds) that the modem waits before calling back

the remote modem.

Command: #CBF? Callback Failed Attempts Display

Values: N/A Default: N/A Description: Requests the number of failed callback passwords since reset or power-up.

This number can be stored to nonvolatile memory using the &W command.

Command: #CBFR Callback Failed Attempts Reset

Values: N/A Default: N/A Description: Resets the number of failed callback passwords to 0. This does not reset the

number stored in nonvolatile memory.

Command: #CBIn Local Callback Inactivity Timer

Values: n = 1–255 Default: 20 Description: Sets the time (in minutes) that the modem waits for a command before

forcing the user to enter the setup password again.

Command: #CBNy=x Store Callback Password

Values: y = 0–29

x = password Defaults: None Description: Sets the callback security password for the y memory location. The password

must have 6 to 10 characters, and cannot include the + or - charact ers.

Command: #CBPn Callback Parity

Values: n = 0, 1, or 2 Default: 0 Description: Sets parity for the callback security messages. #CBP0 No parity. #CBP1 Odd parity. #CBP2 Even parity.

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Chapter 1 – AT Commands, S-Registers and Result Codes

Command: #CBRy Callback Security Reset

Values: y = 0–29 Default: None Description: Clears the password and phone number in the y memory location.

Command: #CBSn Callback Enable/Disable

Values: n = 0, 1, 2, or 3 Default: 0 Description: #CBS0 Disables callback security. #CBS1 Enables local and remote callback security. #CBS2 Enables remote callback security only. #CBS3 Disables callback security until local hang-up or reset.

Command: #Pn Set 11-bit Parity

Values: n = 0 or 1 Default: 2 Description: #P0 No parity. #P1 Odd parity. #P2 Even parity.

Command: #Sx Enter Setup Password

Values: x= password (1–8 characters, case sensitive) Default: MTSMODEM Description: Enters the remote configuration setup password.

Command: #S=x Store Setup Password

Values: x= password (1–8 characters, case sensitive) Default: MTSMODEM Description: Stores a new remote configuration setup password.

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Chapter 1 – AT Commands, S-Registers and Result Codes

Escape AT Commands

Command: +++AT<CR> Escape Sequence

Values: N/A Description: Puts the modem in command mode (and optionally issues a command)

while remaining online. Type +++AT and up to six optional command characters; then press ENTER. Used mostly to issue the hang-up command: +++ATH<CR>.

Command: %%%ATMTSMODEM<CR> Remote Configuration Escape Sequence

Values: N/A Description: Initiates remote configuration mode while online with remote modem.

The remote configuration escape character (%) is defined in register S13.

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Chapter 1 – AT Commands, S-Registers and Result Codes

V.92 Commands

Command: +MS= Modulation Selection

Values: See description. Defaults: See description. Description: This extended-format command selects modulation, enables or disables automode,

and specifies the highest downstream and upstream connection rates using one to four subparameters.

The command syntax is

+MS=[mod][,[automode][,[0][,[max_rate][,[0][,[max_rx_rate]]]]]]<CR> Subparameters that are not entered retain their current value. Commas separate optional subparameters, and must be inserted to skip a subparameter. Exampl e: +MS=,0<CR> disables automode and keeps all other settings at their current values.

+MS=? Reports supported options in the format (list of supported mod values),(list of

supported automode values),(0),(list of supported max_rate values),(0),(list of supported max_rx_rate values). Example: +MS: (BELL103, V21, BELL212A, V22, V22B, V23C, V32, V32B, V34, V90, V92), (0, 1), (0), (0-33600), (0), (0-56000)

+MS? Reports current options in the format mod, automode, 0, max_rate, 0, max_rx_rate.

Example: +MS: V92, 1, 0, 31200, 0, 56000.

Subparameters

mod Specifies the preferred modulation (automode enabled) or the modulation to use in

originating or answering a connection (automode disabled). The default is V92.

mod Modulation Possible rates (bps)

V922 V92 56000, 54666, 53333, 52000, 50666, 49333,

48000, 46666, 45333, 44000, 42666, 41333. 40000, 38666, 37333, 36000, 34666, 33333, 32000, 30666, 29333, or 28000

V903 V.90 56000, 54666, 53333, 52000, 50666, 49333,

48000, 46666, 45333, 44000, 42666, 41333. 40000, 38666, 37333, 36000, 34666, 33333, 32000, 30666, 29333, or 28000

V34 V.34 33600, 31200, 28800, 26400, 24000,

21600,19200, 16800, 14400, 12000, 9600, 7200,

4800, or 2400 V32B V.32bis 14400, 12000, 9600, 7200, or 4800 V32 V.32 9600 or 4800 V22B V.22bis 2400 or 1200 V22 V.22 1200 V23C V.23 1200 V21 V.21 300

Bell212A Bell 212A 1200 Bell103 Bell 103 300

Notes:

1. See optional <automode>, <max_rate>, and <max_RX_rate>

2. Selects V.92 modulation as first priority. If a V.92 connection

3. Selects V.90 modulation as first priority. If a V.90 connection

subparameters.

cannot be established, the modem attempts V.90, V.34, V.32bis, etc. cannot be established, the modem attempts V.34, V.32bis, etc.

automode An optional numeric value that enables or disables automatic modulation

negotiation using V.8 bis/V.8 or V.32 bis Annex A. Automode is disabled if values are specified for the max_rate and max_rx_rate parameters. The options are:

0 Disable automode

1 Enable automode (default)

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Chapter 1 – AT Commands, S-Registers and Result Codes

max_rate An optional number that specifies the highest rate at which the modem may establish an

upstream (transmit) connection. The value is decimal coded in units of bps, for example, 33600 specifies the highest rate to be 33600 bps.

0 Maximum rate determined by the modulation selected in mod (default).

300–33600 Maximum rate value limited by the modulation selected in mod. For valid max_rate values

for each mod value, see the following table.

mod value Valid max_rate values (bps)

V92, V90, V34 31200, 28800, 26400, 24 000, 216 00,19 200, 16800,

14400, 12000, 9600, 7200, 4800, 2400 V32B 19200, 16800, 14400, 12000, 9600, 7200, 4800 V32 14400, 12000, 9600, 7200, 4800 V22B 2400 V22, V23C, Bell212A 1200 V21, Bell103 300

max_rx_rate An optional number that specifies the highest rate at which the modem may establish a

downstream (receive) connection. The value is decimal coded in units of bps, e.g., 28800 specifies the highest rate to be 28800 bps.

0 Maximum rate determined by the modulation selected in mod (default).

300–56000 Maximum rate value limited by the modulation selected in mod. See “Possible

rates” in the mod table.

Command: +PCW=n Call Waiting Enable

Values: n = 0, 1, or 2 Default: 2 Description: Controls the action to be taken upon detection of a call waiting tone in V.92

mode. Values specified by this command are not modified when an AT&F command is issued.

+PCW=0 Toggles V.24 Circuit 125 and collects Caller ID if enabled by

+VCID +PCW=1 Hangs up +PCW=2 Ignores V.92 call waiting +PCW=? Displays the allowed values +PCW? Displays the current value

Command: +PIG=n PCM Upstream Ignore

Values: n = 0 or 1 Default: 1 Description: Controls the use of PCM upstream during V.92 operation. PCM upstream

allows faster upload speeds to a V.92 server. +PIG=0 Disables PCM upstream +PIG=1 Enables PCM upstream +PIG=? Displays the allowed values +PIG? Displays the current value

Command: +PMH=n Modem on Hold Enable

Values: n = 0 or 1 Default: 1 Description: Controls if modem on hold procedures are enabled during V.92 operation.

Normally controlled by a modem on hold program. Values specified by this

command are not modified when an AT&F command is issued. +PMH=0 Enables V.92 modem on hold +PMH=1 Disables V.92 modem on hold +PMH=? Displays the allowed values +PMH? Displays the current value

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Chapter 1 – AT Commands, S-Registers and Result Codes

Command: +PMHF V.92 Modem Hook Flash

Values: N/A Default: N/A Description: Causes the DCE to go on-hook for a specified period of time, and then return

off-hook for at least a specified period of time. The specified period of time is

normally one-half second, but may be governed by national regula t ions.

“ERROR” is returned if MOH is not enabled.

Command: +PMHR=n Modem on Hold Initiate

Values: n = 0–13 Default: 0 Description: +PMHR is an action command that causes the modem to initiate MOH with

the central site modem. It returns the following values to indicate what has

been negotiated. Valid only if MOH is enabled and the modem is off-hook or

in data mode. Otherwise, ERROR will be returned.

+PMHR=0 Deny MOH request

+PMHR=1 Grant MOH request with 10 second timeout

+PMHR=2 Grant MOH request with 20 second timeout

+PMHR=3 Grant MOH request with 30 second timeout

+PMHR=4 Grant MOH request with 40 second timeout

+PMHR=5 Grant MOH request with 1 minute timeout

+PMHR=6 Grant MOH request with 2 minute timeout

+PMHR=7 Grant MOH request with 3 minute timeout

+PMHR=8 Grant MOH request with 4 minute timeout

+PMHR=9 Grant MOH request with 6 minute timeout

+PMHR=10 Grant MOH request with 8 minute timeout

+PMHR=11 Grant MOH request with 12 minute timeout

+PMHR=12 Grant MOH request with 16 minute timeout

+PMHR=13 Grant MOH request with indefinite timeout

+PMHR=? Displays the allowed values

+PMHR? Displays the current value

Command: +PMHT=n Modem on Hold Timer

Values: n = 0–13 Default: 0 Description: Determines if the modem will accept a V.92 Modem on Hold (MOH) request

and will set the MoH timeout.

+PMHT=0 Deny MOH request

+PMHT=1 Grant MOH request with 10 second timeout

+PMHT=2 Grant MOH request with 20 second timeout

+PMHT=3 Grant MOH request with 30 second timeout

+PMHT=4 Grant MOH request with 40 second timeout

+ P M H T= 5 Gr a n t M O H r e q u e s t w i t h 1 m i n u t e t i m eout

+PMHT=6 Grant MOH request with 2 minute timeout

+PMHT=7 Grant MOH request with 3 minute timeout

+PMHT=8 Grant MOH request with 4 minute timeout

+PMHT=9 Grant MOH request with 6 minute timeout

+PMHT=10 Grant MOH request with 8 minute timeout

+PMHT=11 Grant MOH request with 12 minute timeout

+PMHT=12 Grant MOH request with 16 minute timeout

+PMHT=13 Grant MOH request with indefinite timeout

+PMHT=? Displays the allowed values

+PMHT? Displays the current value

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Chapter 1 – AT Commands, S-Registers and Result Codes

Command: +PQC=n Quick Connect Control

Values: n = 0, 1, 2, or 3 Default: 3 Description: Controls V.92 shortened Phase 1 and Phase 2 startup procedures (Quick

Connect). When line conditions are stable, quick connect results in sho rten ed

connect times; however, significant fluctuation in line conditions from call to

call can cause longer connect times; thus, it may be advisable to disable

quick connect.

+PQC=0 Enables Short Phase 1 and Short Phase 2 (Quick Connect) +PQC=1 Enables Short Phase 1 +PQC=2 Enables Short Phase 2 +PQC=3 Disables Short Phase 1 and Short Phase 2

+PQC=? Displays the allowed values

+PQC? Displays the current value

Command: +VCID=n Caller ID Selection

Values: n = 0, 1, or 2 Default: 0 Description: Enables Caller ID detection and configures the reporting and presentation of

the Caller ID data that is detected after the first ring. The reported data

includes the date and time of the call, the caller's name and number, and a

message. Set S0=2.

+VCID=0 Disables Caller ID +VCID=1 Enables Caller ID with formatted data +VCID=2 Enables Caller ID with unformatted data +VCID=? Displays the allowed values +VCID? Displays the current value

Command: +VDR=x, y Distinctive Ring Report

minimum ring cadence that will be reported.

Report format is one line per silence period and one line per ring period. The

length of the silence period is in the form DROF=number in units of 100

ms<CR><LF>, and the length of the ring is in the form DRON=number in

units of 100 ms<CR> <LF>. The modem may produce a Ring event code

after the DRON message if enabled by the y parameter. The y parameter

must be set to a value equal to or smaller than the expected ring cadence in

order to pass the report to the DTE.

+VDR=0, N/A Disables Distinctive Ring cadence reporting. +VDR=1, 0 Enables Distinctive Ring cadence reporting. Other call

progress result codes (including RING) are reported as normal.

+VDR=1, >0 Enables Distinctive Ring cadence reporting. RING result

code is reported after falling edge of the ring pulse (after the DRON

report). +VDR=? Displays the allowed values. +VDR? Displays the current value.

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Chapter 1 – AT Commands, S-Registers and Result Codes

Command: #CBAn Callback Attempts

Values: n = 1–255 Default: 4 Description: Sets the number of callback attempts that are allowed after passwords have

been exchanged between modems.

Command: #CBDn Callback Delay

Values: n = 0–255 Default: 15 Description: Sets the length of time (in seconds) that the modem waits before calling back

the remote modem.

Command: #CBF? Callback Failed Attempts Display

Values: N/A Default: N/A - Description: Requests the number of failed callback passwords since reset or power-up.

This number can be stored to nonvolatile memory using the &W command.

Command: #CBFR Callback Failed Attempts Reset

Values: N/A Default: N/A Description: Resets the number of failed callback passwords to 0. This does not reset the

number stored in nonvolatile memory.

Command: #CBIn Local Callback Inactivity Timer

Values: n = 1–255 Default: 20 Description: Sets the time (in minutes) that the modem waits for a command before

forcing the user to enter the setup password again.

Command: #CBNy=x Store Callback Password

Values: y = 0–29

x = password Defaults: None Description: Sets the callback security password for the y memory location. The password

must have 6 to 10 characters, and cannot include the + or - charact ers.

Command: #CBPn Callback Parity

Values: n = 0, 1, or 2 Default: 0 Description: Sets parity for the callback security messages. #CBP0 No parity. #CBP1 Odd parity. #CBP2 Even parity.

Command: #CBRy Callback Security Reset

Values: y = 0–29 Default: None Description: Clears the password and phone number in the y memory location.

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Chapter 1 – AT Commands, S-Registers and Result Codes

Command: #CBSn Callback Enable/Disable

Command: #Pn Set 11-bit Parity

Values: n = 0 or 1 Default: 2 Description: #P0 No parity. #P1 Odd parity. #P2 Even parity.

Command: #Sx Enter Setup Password

Values: x= password (1–8 characters, case sensitive) Default: MTSMODEM Description: Enters the callback security setup password.

Command: #S=x Store Setup Password

Values: x= password (1–8 characters, case sensitive) Default: MTSMODEM Description: Stores a new callback security and remote configuration setup password.

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Chapter 1 – AT Commands, S-Registers and Result Codes

S-Registers

Certain modem values, or parameters, are stored in memory locations called S-Registers. Use the S command to read or to alter the contents of S-Registers (see previous section).

disables auto answer completely.

S1 1 ring 0–255 0 Counts the rings that have occurred. S2 decimal 0–127 43 (+) Sets ASCII code for the escape sequence character.

128–255 Values greater than 127 disable escape.

S3 decimal 0–127 13 (^M) Sets the ASCII code for the carriage return character. S4 decimal 0–127 10 (^J) Sets the ASCII code for the line feed character. S5 decimal 0–32 8 (^H) Sets the ASCII code for the backspace character.

33–127 Values greater than 32 disable backspace. S6 seconds 2–65* 2* Sets the time the modem waits after it goes off-hook before it

begins to dial the telephone number.

S7 seconds 35-65* 50* Sets the time the modem waits for a carrier signal before

aborting a call. Also sets the wait for silence time for the @ dial modifier.

S8 seconds 0–65 2 Sets the length of a pause caused by a comm a character in a

dialing command.

S9 decimal 0, 1–127 37 (%) Sets ASCII code for remote configuration escape character.

S9=0 disables remote configuration.

S10 100 ms 1–254 20 Sets how long a carrier signal must be lost before the modem

disconnects.

S11 1 ms 50–150* 95* Sets spacing and duration of dialing tones. S28 decimal 0, 1–255 1 0 disables, 1–255 enables V.34 modulation. S30 1 minute 0, 1–255 0 Sets the length of time that the modem waits before

disconnecting when no data is sent or received. A value of zero disables the timer. See also the \T command

S35 decimal 0–1 1 0 disables, 1 enables the V.25 calling tone, which allows

remote data/fax/voice discrimination.

S36 decimal 0–7 7 Specifies the action to take in the event of a negotiation failure

when error control is selected. (See S48.)

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Chapter 1 – AT Commands, S-Registers and Result Codes

S37 decimal 0–19 0 Sets the maximum V.34 “upstream” speed at which the

modem attempts to connect. 0 = maximum speed 1 = reserved 2 = 1200/75 bps 3 = 300 bps 4 = reserved

5 = 1200 bps

6 = 2400 bps

7 = 4800 bps

8 = 7200 bps

9 = 9600 bps

10 = 12000 bps

11 = 14400 bps

12 = 16800 bps

13 = 19200 bps

14 = 21600 bps

15 = 24000 bps

16 = 26400 bps

17 = 28800 bps

18 = 31200 bps

19 = 33600 bps S38 decimal 0–23 1 Sets “downstream” data rate where V.90 provid es rates of

28,000 to 56,000 bps in increments of 1,333 bps. 0 = V.90 disabled

1 = V.90 auto rate

2 = 28,000 bps

3 = 29,333 bps

4 = 30,666 bps

5 = 32,000 bps

6 = 33,333 bps

7 = 34,666 bps

8 = 36,000 bps

9 = 37,333 bps

10 = 38,666 bps

11 = 40,000 bps

12 = 41,333 bps

13 = 42,666 bps

14 = 44,000 bps

15 = 45,333 bps

16 = 46,666 bps

17 = 48,000 bps

18 = 49,333 bps

19 = 50,666 bps

20 = 52,000 bps

21 = 53,333 bps

22 = 54,666 bps

23 = 56,000 bps Upstream data rates: Upstream V.90 data rates are 4800 to

33,600 bps in 2400 bps increments. S43 decimal 0–1 1 For testing and debugging only. Enables/disables V.32bis

start-up auto mode operation. 0 = disable; 1 = enable.

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Chapter 1 – AT Commands, S-Registers and Result Codes

S48 decimal 7 or 128 7 Enables (7) or disables (128) LAPM negotiation. The following

table lists the S36 and S48 configuration settings for certain

types of connections.

S48=7 S48=128

S36=0, 2 LAPM or hang up Do not use S36=1, 3 LAPM or async Async S36=4, 6 LAPM, MNP, or hang up MNP or hang up S36=5, 7 LAPM, MNP, or async MNP or async

S89 seconds 0, 5–255 10 Sets the length of time in the off-line command mode before

the modem goes into standby mode or “sleep mode”. A value

of zero prevents standby mode; a value of 1–4 sets the value

to 5. Standby mode (sleep mode or low power mode) is

controlled by S89. It programs the number of seconds of

inactivity before the modem will go to sleep. The default value

is 0. A value of 0 disables standby mode. The modem will

wake on an incoming ring or an AT command. S108 decimal 0–3, 6, 7 6 Selects the 56K digital loss if using the modem through a PBX

line. The default value is -6 dB loss, the value used when

calling from a typical POTS line long distance. 0 = -0 dB digital loss, no robbed-bit signaling

1 = -3 dB PBX digital loss

2 = -2 dB digital loss

3 = -3 dB digital loss

6 = -6 dB digital loss

7 = -0 dB digital loss with robbed-bit signaling

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Chapter 1 – AT Commands, S-Registers and Result Codes

Result Codes

In command mode your modem can send responses called Result Codes to your computer. Result codes are used by communications programs and ca n also appear on your monitor.

Terse Verbose Description

0 OK Command executed 1 CONNECT Modem connected to line 2 RING Ring signal detected 3 NO CARRIER Carrier signal lost or not detected 4 ERROR Invalid command 5 * CONNECT 1200 Connected at 1200 bps 6 NO DIALTONE No dial tone detected 7 BUSY Busy signal detected 8 NO ANSWER No answer at remote end 9 CONNECT 75 Connected at 75 bps 10* CONNECT 2400 Connected at 2400 bps 11* CONNECT 4800 Connected at 4800 bps 12* CONNECT 9600 Connected at 9600 bps 13* CONNECT 14400 Connected at 14400 bps 14* CONNECT 19200 Connected at 19200 bps 18 CONNECT 57600 Connected at 57600 bps 24* CONNECT 7200 Connected at 7200 bps 25* CONNECT 12000 Connected at 12000 bps 28 CONNECT 38400 Connected at 38400 bps 40* CONNECT 300 Connected at 300 bps 55* CONNECT 21600 Connected at 21600 bps 56* CONNECT 24000 Connected at 24000 bps 57* CONNECT 26400 Connected at 26400 bps 58* CONNECT 28800 Connected at 28800 bps 59* CONNECT 31200 Connected at 31200 bps 60* CONNECT 33600 Connected at 33600 bps 70 CONNECT 32000 Connected at 32000 bps 71 CONNECT 34000 Connected at 34000 bps 72 CONNECT 36000 Connected at 36000 bps 73 CONNECT 38000 Connected at 38000 bps 74 CONNECT 40000 Connected at 40000 bps 75 CONNECT 42000 Connected at 42000 bps 76 CONNECT 44000 Connected at 44000 bps 77 CONNECT 46000 Connected at 46000 bps 78 CONNECT 48000 Connected at 48000 bps 79 CONNECT 50000 Connected at 50000 bps 80 CONNECT 52000 Connected at 52000 bps 81 CONNECT 54000 Connected at 54000 bps 82 CONNECT 56000 Connected at 56000 bps 83 CONNECT 58000 Connected at 58000 bps 84 CONNECT 60000 Connected at 60000 bps 86 CONNECT 16800 Connected at 16800 bps 87 CONNECT 115200 Connected at 115200 bps 88 DELAYED Delay is in effect for the dialed number 89 BLACKLISTED Dialed number is blacklisted 90 BLACKLIST FULL Blacklist is full 91 CONNECT 230400 Connected at 230400 bps 100 CONNECT 28000 Connected at 2800 0 bps 101 CONNECT 29333 Connected at 2933 3 bps 102 CONNECT 30666 Connected at 3066 6 bps 103 CONNECT 33333 Connected at 3333 3 bps 104 CONNECT 34666 Connected at 3466 6 bps 105 CONNECT 37333 Connected at 3733 3 bps 106 CONNECT 38666 Connected at 3866 6 bps 107 CONNECT 41333 Connected at 4133 3 bps 108 CONNECT 42666 Connected at 4266 6 bps 109 CONNECT 45333 Connected at 4533 3 bps 110 CONNECT 46666 Connected at 4666 6 bps 111 CONNECT 49333 Connected at 4933 3 bps

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Chapter 1 – AT Commands, S-Registers and Result Codes

112 CONNECT 50666 Connected at 5066 6 bps 113 CONNECT 53333 Connected at 5333 3 bps

114 CONNECT 54666 Connected at 5466 6 bps 115 CONNECT 25333 Connected at 2533 3 bps 116 CONNECT 26666 Connected at 2666 6 bps

* EC is added to these result codes when the extended result codes configuration option is enabled. EC is replaced by one of the following codes, depending on the type of error control connection:

V42bis – V.42 error control (LAP-M) and V.42bis data compression V42 – V.42 error control (LAP-M) only MNP5 – MNP 4 error control and MNP 5 data compression MNP4 – MNP 4 error control only NoEC – No error control protocol).

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Chapter 2 – Fax Class 1 and 1.0 Commands

Chapter 2 – Fax Class 1 and Class 1.0 Commands

Fax I/O Processing

The fax I/O interface supports asynchronous serial and parallel interfaces. The character format is 8 bit 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 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 action are described below.

DTE-to-Modem Transmit Data Stream

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.

Modem-to-DTE Receive Data Stream

Characters Detected Action Taken

<DLE> Insert extra <DLE> ahead of <DLE>. The modem also identifies the end of a frame by inserting <DLE><ETX> into the data stream after the

FCS bytes.

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Chapter 2 – Fax Class 1 and 1.0 Commands

Fax Mode Selection

Fax Class 1 and Fax Class 1.0 commands are identified in Table 3-1 .

Table 3-1. Fax Class 1 and Fax Class 1.0 Commands Command/Parameter Function Applicable in

Fax Class 1

+FCLASS=<class> Select, read or test service class X X +FAA=<value> Auto answer enable - X +FAE=<value> Auto answer enable X X +FTS=<time> Stop transmission and pause X X +FRS=<time> Wait for silence X X +FTM=<mod> Transmit data with <mod> carrier X X +FRM=<mod> Receive data with <mod> carrier X X +FTH=<mod> Transmit HDLC data with <mod> carrier X X +FRH=<mod> Receive HDLC data with <mod> carrier X X +FAR=<off/on> Adaptive reception control - X +FCL=<time> Carrier loss timeout - X +FDD=<value> Double esc ape character replacement control - X +FIT=<time>, <action> DTE inactivity timeout - X +FPR=<rate> Fixed DTE Rate - X +FMI? Report manufacturer ID - X +FMM? Report model ID - X +FMR? Report revision ID - X +FLO Flow Control - X &K Local DTE-modem flow control (see Call

Control Section) A Answer X X D<string> Dial X X H Hang-up (see Call Control Section) X X

X stands for Applicable. - stands for Not Applicable.

X X

Applicable in Fax Class 1.0

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 a re detected from the remote.

Fax Answering

Answering of fax calls is identical to answering of data calls with the exception that the modem enters the fax handshaking mode instead of the data handshaking mode after going off-hoo k. 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 DATA or FAX result code, respectively, to the DTE.

Fax Control Transmission

Fax control transmission is initiated by the +FTH=<mod> command. After this command is issued, the modem generates the CONNECT message and transmits 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> characte r 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.

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Chapter 2 – Fax Class 1 and 1.0 Commands 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 Control Reception

Fax control reception is initiated using the AT+FRH=<mod> comma nd. After this command is issued, the modem looks for carrier in the modulation scheme specified by the parameter n. If no carrier is dete cted 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 the OK message if no errors were detected or the ERROR message if errors were detected (FCS is incorrect) and returns to command mode.

While in command mode, the modem continues to receive data in the selected modulation sche me, and sends the data after sending the CONNECT message to the DTE when the DTE reissues the +F RH 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 carrier is lost while in command mode and the DTE reissues the +FRH command with the same parameter, and there is no data in the buffer, the modem sends the ERROR result code to the DTE and returns to the command mode. If there is 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 carrier is lost for any period of time during or before the reception of a frame. If 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 sub seq uent data received from the remote is 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 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 is 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 dro p while &D3 is in effect, the modem performs a warm reset.

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Chapter 2 – Fax Class 1 and 1.0 Commands

Fax Data Transmission

Fax data transmission is initiated by the AT+FTM=<mod> command. After this command is issue d, the modem generates the CONNECT message and transmits carrier in the modulation scheme specified by the parameter n. The modem then transmits constant 1 bits for a minimum of one second and continues to transmit constant 1 bits until it receives a character from the DTE.

When data is received from the DTE, the modem deletes start and stop bits and deletes all <DLE><ch r> character pairs before transmitting the data to the remote. Each <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> 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 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 furthe r data from the DTE while transmitting NULLs to the remote. If more data is 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 is 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=<mod> comman d. After this command is issued, the modem looks for carrier in the modulation scheme specified by the parameter n. If no carrier is dete cted 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 m ode. 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 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 is 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.

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Chapter 2 – Fax Class 1 and 1.0 Commands

Commands and Parameters

Mode Entry Commands

+FCLASS=1 Select Facsimile Class 1 Mode

+FCLASS=1 selects the Fax Class 1 Mode. The Fax Class 1 Mode commands and responses described in this section are applicable when command +FCLASS=1 as shown in Table 3-1.

+FCLASS=1.0 - Select Facsimile Class 1.0 Mode

+FCLASS=1.0 selects the Fax Class 1.0. The Fax Class 1.0 Mode commands and responses described

in this section are applicable when command +FCLASS=1.0 as shown in Table 3-1.

Mode Commands

Command: +FAA Auto Answer Enable - Class 1.0

Description: This command enables or disables fax adaptive answer. This command

operates identically to the +FAE command. Defined Values: <value> Decimal number corresponding to the selected option. 0 Disable data /fax auto answer mode. (Default.) 1 Enable data /fax auto answer mode. The modem determines the calling type

and issues DATA result code (13) if the caller is a data modem or issues FAX

result code (15) if the caller is a fax modem.

Command: +FAE Auto Answer Enable - Class 1 and 1.0

Description: This command enables or disables fax adaptive answer. This command

operates identically to the +FAA command. Defined Values: <value> Decimal number corresponding to the selected option. 0 Disable data /fax auto answer mode. (Default.) 1 Enable data /fax auto answer mode. The modem determines the calling type

and issues DATA result code (13) if the caller is a data modem or issues FAX

result code (15) if the caller is a fax 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.

Command: +FTS Transmit Silence

Description: This command causes the modem to terminate a transmission and wait for

<time> 10-ms intervals before responding with the OK result code. Defined Values: <time> Decimal number from 0 (default) to 255 that specifies the length of

time in 10-ms intervals to delay before responding with the OK result code

after terminating the session. Result Codes: OK Reported when transmission has been terminated for the specified

amount of time. ERROR <value> is invalid or this command is issued while the modem is on-

hook. Reporting Supported Range of Parameter Values: Command: +FTS=? Response: +FTS: <time> range Example: +FTS: 0-255.

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Chapter 2 – Fax Class 1 and 1.0 Commands

Command: +FRS Receive Silence

Description: This command causes the modem to listen and report an OK result code

when silence has been detected on the line for the specified period of time.

This command will terminate when the required period of silence is detected

or when the DTE sends the modem another character other than XON or

XOFF, which is discarded. In either event, the OK result code is returned. This command is aborted if any character is received from the DTE after

receipt of the command but before the time delay elapses. In this case, the

modem discards the aborting character and issues an OK result code. Defined Values: <time> Decimal number from 0 (default) to 255 which specifies the length of

time in 10-ms intervals to delay before responding with the OK result code

after detecting silence on the line. Result Codes: OK Reported when silence has been present on the line for the specified

amount of time or when the DTE sends the modem a character other than

XON or XOFF. ERROR <value> is invalid or this command is issued while the modem is on-

hook. Reporting Supported Range of Parameter Values: Command: +FRS=? Response: +FRS: <time> range Example: +FRS: 0-255

Command: +FTM Transmit Facsimile

Description: This command causes the modem to transmit data using the modulation

defined below. When a valid <mod> value is entered, the modem transmits

the proper training sequence in the selected mode, followed by constant 1 bits

until data is received from the DTE. The modem also returns the CONNECT

result code at the beginning of the training sequence. Defined Values: <mod> Decimal number corresponding to the selected modulation mode and

data rates shown in Table 3-2.

Table 3-2. Fax Class 1 and Fax Class 1.0 Modulation Modes and Rates

<mod> Modulation Training Modulation Mode and Rate

3 24 48 72 73 74 96 97 98

121 122 145 146

V.21 V.27 ter V.27 ter V.29 V.17 Long 7200 bps long V.17 Short 7200 bps short V.29 V.17 Long 9600 bps long V.17 Short 9600 bps short V.17 Long 12000 bps long V.17 Short 12000 bps short V.17 Long 14400 bps long V.17 Short 14400 bps short

300 bps 2400 bps 4800 bps 7200 bps

9600 bps

Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C) 38

Chapter 2 – Fax Class 1 and 1.0 Commands Result Codes: CONNECT – Reported when the modem begins the training sequence after

receipt of a valid <mod> value.

ERROR – If the modem transmit buffer becomes empty and the last

transmitted character is NUL (00), the modem continues to transmit NULs until the DTE sends more data or five seconds elapses. After five seconds elapse with an empty transmit buffer, the modem will turn off the transmit carrier, return to the command state, and report the ERROR result code.

OK – If the modem’s transmit buffer becomes empty and the last transmitted

character is not NUL, the modem will turn off the transmit carrier, return to the

command state, and report the OK result code. Reporting Current or Selected Values: Command: +FTM? Response: +FTM: <mod> Example: +FTM: 98 For V.17 9600 bps. Reporting Supported Range of Parameter Values: Command: +FTM=? Response: +FTM: (<mod> range) Example: +FTM: 3,24,48,72,73,74,96,97,98,121,122,145,146

Command: +FRM Receive Facsimile

Description: This command causes the modem to enter the receiver mode using the

modulation defined below. Defined Values: <mod> Decimal number corresponding to the selected modulation mode and

data rates shown in Table 3-2. Reporting Current or Selected Values: Command: +FRM? Response: +FRM: <mod> Example: +FRM: 98 for V.17 9600 bps. Reporting Supported Range of Parameter Values: Command: +FRM=? Response: +FRM: (<mod> range) Example: +FRM: 3,24,48,72,73,74,96,97,98,121,122,145,146 Result Codes: CONNECT – Reported when the selected carrier is detected. +FCERROR – Reported if another carrier is detected and FAR=0; the modem

then returns to the command state. NO CARRIER – Reported if loss-of-carrier is detected. OK – Reported if the DTE sends any character to the modem other than XON

or XOFF while operating in configured flow control from the DTE; the modem

then returns to the command state.

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Chapter 2 – Fax Class 1 and 1.0 Commands

Command: FTH Transmit Data with HDLC Framing

Description: This command causes the modem to transmit data using HDLC protocol and

the modulation defined below. Defined Values: <mod> Decimal number corresponding to the selected modulation mode and

data rates shown in Table 3-2. Result Codes: CONNECT Reported for either of two conditions:

1. At the beginning of transmission of the training pattern for the selected

modulation.

2. If the Final Frame bit is 0. OK Reported for either of two conditions:

1. If the Final Frame Bit is 1.

2. If the DTE sends only <DLE><ETX> (a null frame) while transmitting flags.

ERROR – Reported if five seconds elapse from the time when the modem

reported the CONNECT result code without any additional data transmitted

from the DTE; the modem then turns off carrier and returns to the command

mode. Reporting Current or Selected Values: Command: +FTH? Response: +FTH: <mod> Example: +FTH: 98 For V.17 9600 bps. Reporting Supported Range of Parameter Values: Command: +FTH? Response: +FTH? Example: +FTH: 98 For V.17 9600 bps.

Command: +FRH Receive Data with HDLC Framing

Description: This command 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. Defined Values: <mod> Decimal number corresponding to the selected modulation mode and

data rates shown in Table 3-2. Reporting Current or Selected Values: Command: +FRH? Response: +FRH: <mod> Example: +FRH: 98 For V.17 9600 bps. Reporting Supported Range of Parameter Values: Command: +FRH? Response: +FRH? Example: +FRH: 98 For V.17 9600 bps. Result Codes: CONNECT Reported for either of two conditions:

1. When the selected carrier is detected with an HDLC flag.

2. If the DTE sends another +FTH=<MOD> command after sending the result

code indicating frame reception is complete. +FCERROR – Reported if a different carrier is detected and FAR=0. NO CARRIER – Reported if loss of carrier is detected. OK – Reported for either of two conditions:

1. If a frame was received correctly.

2. If the DTE sends any character other than XON or XOFF while the modem

is in the configured flow control. ERROR – Reported if a frame was received in error.

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Chapter 2 – Fax Class 1 and 1.0 Commands

Service Class 1 Commands

Command: +FAR Adaptive Reception Control

Description: If Adaptive Reception is enabled, the modem adaptively detects the selected

message carrier or V.21 control messages. If the expected carrier is detected,

the modem operates as specified in the respective +FRM=<mod or

+FRH=<mod commands. If V.21 flag preamble is detected instead, the

modem issues a +FRH:3 intermediate result code, and then executes an

implied +FRH=3 command. Defined Values: <value> Decimal number corresponding to the selected option. 0 Disable Adaptive Reception. (Default.) 1 Enable Adaptive Reception. Reporting Current or Selected Values: Command: +FAR? Response: +FAR: <value Example: +FAR: 0 For the default setting. Reporting Supported Range of Parameter Values: Command: +FAR=? Response: +FAR: (<value> range ) Example: +FAR: (0,1)

Command: +FCL Carrier Loss Timeout

Description: This parameter allows the DTE to select the modem’s loss-of-carrier delay

between initial loss-of-carrier and qualified loss-of-carrier, when the modem

will give up and exit a receive mode. Intermediate (less than FCL timeout)

loss-of-carrier should be indicated by insertion of the SQ-BAD signal quality

indicator in the received data stream. In unframed receive modes, if the modem detects RTC as described in

Recommendation T.30 prior to initial loss of the high speed carrier, or if the

modem detects V.21 carrier after initial loss of high speed carrier, then the

modem immediately accepts the loss-of-carrier as qualified, without waiting for

the FCL timer to expire. In HDLC receive modes, if the modem detects HDLC abort prior to initial loss

of the high speed carrier, or if the modem detects V.21 carrier after initial loss

of high speed carrier, then the modem l immediately accepts the loss-of-

carrier as qualified, without waiting for the FCL timer to expire. Defined Values: <value> Decimal number representing the loss-of-carrier delay time in units of

100 ms. The range is 0 - 255. Reporting Current or Selected Values: Command: +FCL? Response: +FCL: <time Example: +FCS: 0 For the default setting. Reporting Supported Range of Parameter Values: Command: +FCL=? Response: +FCL: (time range) Example: +FCL: (0-255)

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Chapter 2 – Fax Class 1 and 1.0 Commands

Command: +FDD Double Escape Character Replacement

Description: This parameter conditions the use of the ˜DLE˜˜˜SUB˜ pair to encode

consecutive <1/0 <1/0 in data. This may be used to prevent unbound

expansion of data that contains many <1/0 patterns. Defined Values: <value> Decimal number corresponding to the selected option. For modem

decode of <DLE>, the defined range are: 0 <DLE> <DLE> or discard (default and only) 1 <DLE> <DLE> (not supported) For modem encoding of <1/0> <1/0>the defined values are: 0 <DLE> <DLE> <DLE> <DLE> (default and only) 1 <DLE> (not supported) Reporting Current or Selected Values: Command: +FDD? Response: +FDD: <value> Example: +FDD: 0 For the default setting. Reporting Supported Range of Parameter Values: Command: +FDD=? Response: +FDD: (<value> range) Example: +FDD: (0)

Command: +FIT DTE Inactivity Timeout

Description: This command specifies a DTE inactivity timeout value that allows the modem

to break away from an unsuccessful connection attempt at any stage of a

facsimile transfer. The DTE inactivity timer operates only while the modem is

off-hook. Defined Values: <time The <time parameter indicates the DTE inactivity timeout in seconds.

The value of 0 indicates that timeout is disabled (default). The required

timeout range is 1 to 255 seconds. The inactivity timer starts when the modem

has taken some action that requires DTE response. If the DTE does respond,

the modem resets the inactivity timer. Inactivity timer related events are listed

in Table 3-3. <action The <action parameter has two meanings. 0 Upon timeout, the modem will go on-hook, executing an implied ATH

command; then reset to +FCLASS 0. 1 Upon timeout, the DCE will only go on-hook. Reporting Current or Selected Values: Command: +FIT? Response: +FIT: <time ,action Example: +FIT: 0,0 For the default settings. Reporting Supported Range of Parameter Values: Command: +FIT? Response: +FIT: (<time> range), (<action> range) Example: +FIT: (0-255),(0-1)

Table 3-3. Inactivity Timer Start and Stop Events

On-line state Start timer event Stop timer event

Waiting for a command modem sends final result code DTE sends AT or “at” Waiting for transmit data modem sends CONNECT after +FTM or

+FTH command Waiting for transmit data modem sends <XON or sets CTS ON DTE sends data Waiting to deliver received data modem sends <XOFF after +FRM or +FRH

command Waiting to deliver received data DTE sets V.24 Ckt 133 OFF after +FRM or

+FRH command

DTE sends data

DTE sends <XON DTE sets V.24 Ckt 133

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Chapter 2 – Fax Class 1 and 1.0 Commands

Command: +FPR Fixed DTE Rate

Description: This numeric extended-format para meter specifies the data rate at which the

modem will accept commands during on-line operation. It may be used to select operation at rates at which the modem is not capable of automatically detecting the data rate being used by the DTE. Specifying a value of 0 disables the function and allows operation only at rates automatically detectable by the modem. The specified rate takes effect following the issuance of any result code(s) associated with the current command line.

The <rate> specified does not apply in Online Data State if Normal Mode

(Direct Mode) of operation is selected. Syntax: +FPR=<rate code> Defined Values: <rate code> Specifies the DTE-modem interface operation rate in bits/s with a

rate code. The available rate codes are: 0 Automatic detection (default) 1 2400 bits/s (executes +IPR=2400) 2 4800 bits/s (executes +IPR=4800) 4 9600 bits/s (executes +IPR=9600) 8 19200 bits/s (executes +IPR=19200) 10 38400 bits/s (executes +IPR=38400) 18 57400 bits/s (executes +IPR=57400) If unspecified or set to 0, automatic detection is selected and the character

format is also forced to autodetect, +ICF=0. If the rate specified is not supported by the modem, an ERROR result code

will be returned. Reporting Current or Selected Values: Command: +FPR? Response: <rate code> Example 1: 0 For automatic rate detection. Example 2: 18 For 57600 bits/s. Reporting Supported Range of Parameter Values: Command: +FPR=? Response: (<rate code> range) Example: (0,1,2,4,8,10,18)

Command: +FMI? Request Manufacturer Identification

Description This command causes the modem to report the modem product manufacturer. Syntax: +FMI? Typical Response: Multi-Tech OK

Command: +FMM? Request Model Identification

Description: This command causes the modem to report the modem product model. Syntax: +FMM? Typical Response: V90 OK

Command: +FMR? Request Revision Identification

Description: This command causes the modem to transmit one or more lines of information

text identifying the modem version, revision level, or date. Syntax: +FMR? Typical Response: V3.001-V90_2M_DLS OK

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Chapter 2 – Fax Class 1 and 1.0 Commands

Command: +FLO Flow Control

Description: This parameter allows the DTE to identify and select the type of flow control

used. Syntax: +FLO=<method> Defined Values: <method> Decimal number corresponding to the selected option. 0 XON/XOFF and RTS/CTS flow control turned off. 1 Use XON/XOFF flow control in either direction. 2 Use RTS for flow control of the modem by the DTE; use CTS for flow control

of the DTE by the modem. Reporting Current or Selected Values: Command: +FLO? Response: +FLO: <method> Example: +FLO: 0 For the default setting. Reporting Supported Range of Parameter Values: Command: +FLO=? Response: +FLO: (<method>range) Example: +FLO: (0-2) Result Codes: OK <method> = 0-2. ERROR Otherwise.

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Chapter 2 – Fax Class 1 and 1.0 Commands

Examples

Examples of calling (transmitting) and answering (receiving) one page using Fax Class 1 commands are shown in Table 3-4 and Table 3-5, respectively. The examples show the interchange between the DTE and the modem for various cases. Comments are included to explain how to handle various situations. Commands and responses are in upper case and comments are in lower case. All streams of data denoted by <..frame> are terminated by the <DLE><ETX> characters.

Table 3-4. Fax Class 1 Calling Sequence (Transmitting a Single Page)

DTE Commands Modem Responses Local Modem Action Remote Station Action Notes

AT+FCLASS=1 OK Set Class 1 ATDT<string>

AT+FRH=3

AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier AT+FRH=3

AT+FTS=8; +FTM=96

AT+FRH=3

AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier AT+FTM=96

AT+FTS=8; +FRH=3

AT+FRH=3

CONNECT <NSF frame> <DLE><ETX> OK

CONNECT <CFI frame data> <DLE><ETX> OK

CONNECT <DIS frame data> <DLE><ETX> OK

CONNECT

CONNECT <CFR frame data> <DLE><ETX> OK

CONNECT

CONNECT OK

CONNECT <MCF frame data> <DLE><ETX> OK

Dial and send CNG Look for V.21 Detect flags

Detect flags get CSI get FCS accept FCS

Detect flags get DIS get FCS accept FCS

send V.21 carrier send flags send TSI frame send FCS send flags send DCS frame send FCS, flags drop carrier

wait 80 ms send V.29 carrier

send TCF data drop carrier

detect carrier detect flags get CFR frame check FCS accept FCS

send V.29 carrier send page data drop carrier

wait 80 ms send V.21 carrier send flags send EOP frame send FCS drop carrier

detect carrier detect flags get MCF frame check FCS accept FCS

Answer send CED, V.21 Send HDLC flags

Send NSF frame

AT+FRH=3 implied by dialing with +FCLASS=1.0

send CSI frame check FCS

send DIS frame check FCS

detect carrier detect flags get TSI frame

get DCS frame

detect carrier get TCF data

send V.21 carrier send flags get CRF frame send FCS

detect carrier receive page

detect carrier detect flags receives EOP

send V.21 carrier send flags get MCF frame send FCS

Frame status OK DTE must detect final

frame bit to anticipate loss of carrier

Final frame bit clear tells the modem to expect another frame. Final frame bit set tells the modem not to expect another frame

Final frame bit set. frame OK

final frame

Final frame bit set. frame OK

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Chapter 2 – Fax Class 1 and 1.0 Commands

DTE Commands Modem Responses Local Modem Action Remote Station Action Notes

AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier AT+FRH=3

ATH0 OK hang up hang up

CONNECT

send V.21 carrier send flags send DNC frame send FCS drop carrier

detect carrier detect flags receive DC|NC

final frame

Table 2-5. Fax Class 1 Answering Sequence (Receiving a Single Page)

DTE Commands Modem Responses Local Modem Action Remote Station Action Notes

AT+FCLASS=1 OK Set Class 1 RING<- detect ringing dials [,send CNG] ATA

AT+FRH=3

AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier DTE did not check final

AT+FTM=96

AT+FRH=3

AT+FTM=96

CONNECT CONNECT

CONNECT <TSI frame data> <DLE><ETX> OK

CONNECT <DCS frame data> <DLE><ETX> OK

CONNECT <TCF data> <DLE><ETX> OK

CONNECT

CONNECT <page image data> <DLE><ETX> NO CARRIER

CONNECT <EOP frame data> <DLE><ETX> NO CARRIER

off-hook, send CED, send V.21 carrier send flags send CSI frame send FCS send flags send DIS data send FCS and flags drop carrier

detect carrier detect flags receive TSI receive FCS accept FCS

receive DCS receive FCS accept FCS

detect carrier receive TCF detect loss-of-carrier

send V.21 carrier send flags get CRF frame send FCS drop carrier

detect carrier receive page detect loss-of-carrier

detect carrier detect flags receive EOP receive FCS accept FCS

get CED, detect carrier detect flags receive CSI get FCS get flags get DIS get flags

AT+FRH=3 implied by answering with +FCLASS=1.0. not final frame

final frame

send V.21 carrier send flags send TSI frame send FCS

send DCS frame send FCS

wait 75 ms send V.29 carrier send TCF data drop carrier

detect carrier detect flags receive CFR

send V.29 carrier send page data drop carrier

wait 75 ms send V.21 carrier send flags send EOP frame send FCS

frame OK

final frame bit set frame OK

frame bit and issued +FRH=3

final frame

frame OK

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Chapter 2 – Fax Class 1 and 1.0 Commands

DTE Commands Modem Responses Local Modem Action Remote Station Action Notes

AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier AT+FRH=3

AT+FRH=3

AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier end of session ATH0 OK hang up

CONNECT

OK CONNECT

<DCN frame data> <DLE><ETX> OK

send V.21 carrier send flags get MCF frame send FCS accept FCS

detect carrier detect flags receive DCN receive FCS accept FCS

detect carrier detect flags receive MCF frame

send V.21 carrier send flags send DCN frame send FCS

final frame

frame OK

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Chapter 3 – Fax Class 2 Commands

Chapter 3 – Fax Class 2 and 2.0/2.1

Commands

Introduction

This chapter summarizes the fax Service Class 2 and Service Class 2.0/2.1 command sets as implemented in Multi-Tech Systems, Inc. modems. The Service Class 2.0 comm and set applies to facsimile communications at speeds up to 14 400 bits per second (bps). The Service Class 2.1 command set is a modification of the Class 2.0 command set for facsimile communications at V.34 speeds up to 33 600 bits per second (bps), as documented in ITU-T T.32 Amendment 1. Because the two command sets differ only in subparameter values for a few Class 2.1 command s, they are treated here as a single Class 2.1 command set with differences noted as appropriate.

The Multi-Tech implementation of Class 2.1 follows ITU-T Recommendation T.32 as amended, except for a few subparameter values. Again, differences are noted as appropriate.

This Chapter also summarizes the Multi-Tech implementation of the Service Class 2 command set, which was based on EIA proposed standard TIA-592 (August 1990). The complete Multi-Tech Class 2 Developer’s Kit can be downloaded from

http://www.multitech.com/DOCUMENTS/manuals/82006502.pdf

purchased from Global Engineering Documents at http://global.ihs.com/.

. EIA/TIA documents can be

Please note that the Class 2 and Class 2.0 commands though similar in outline are sometimes quite different in detail. Class 2 is a proposed early version of Class 2.0 that was never approved, but was widely implemented by modem manufacturers. As a result, all implementations of Class 2 are nonstandard and manufacturer-specific. Class 2.0 is the version of Class 2 that was approved by the ITU after substantial changes to the original proposal. Major changes in clude a shortening of command names to three characters, a change from decimal values to hexadecimal value s, the elimination of some commands, and the addition of others.

This chapter is organized so that Class 2 commands are described with and compared to the equivalent Class 2.1 commands.

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Chapter 3 – Fax Class 2 Commands

AT Command Implementation

The best way to get an understanding of how Class 2.1 commands or responses are used is to present an example of the transmission and reception of a one-page fax using Class 2.1.

Below are the commands and responses given to and returned from the transmitti ng and receiving modems. Commands are shown in upper case, responses in lower case.

Transmitting Modem Receiving Modem Line # Command/response Comments Line # Command/response Comments

T1 AT+FCLASS=2.1 Set class to originate as a fax

modem

T2 ok R2 ok AT+FNR = 1,1,1,1 Enable all fax responses. AT+FNR = 1,1,1,1 Enable all fax

T3 AT+FLI=”666 6676" Set local fax ID R3 AT+FLI=”555 1212" Set local fax ID T4 ok R4 ok T5 ATDT5551212 Dial the receiving fax modem R5 ring

T6 +FCO Fax connection received T7 +fci:”555 1212" Remote fax’s identification string T8 +fis:0,5,0,2,0,0,0,0 Remote fax’s capabilities T9 ok T10 AT+FDT Begin negotiation and page

transmission

R7 +FCO Fax connection

R8 +fti:”666 6676" Remote fax’s

R9 +fcs:0,5,0,2,0,0,0,0 Negotiated fax

R10 ok R11 AT+FDR Begin page

T11 +fcs:0,5,0,2,0,0,0,0 Negotiated fax parameters R13 +fcs:0,5,0,2,0,0,0,0 Final negotiated

T12 connect Ready for page data R14 connect Ready to receive

T13 R15 <DC2>

R1 AT+FCLASS=2.1 Set class to

answer as a fax modem. Tell the modem the host can receive documents and to auto-detect the calling modem. Required setting: +FCLASS=2.1

responses.

received

identification string

parameters (speed may change)

reception

fax parameters

page data

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Chapter 3 – Fax Class 2 Commands

Transmitting Modem Receiving Modem Line # Command/response Comments Line # Command/response Comments

T14 <page data> Send T.4 formatted page data R16 <page data> Receive T.4 for-

matted page data

T15 <DLE><EOP> R17 +fps:1000,0,0,0 1000 lines

received

T16 This is the last page R18 +fet:2 This is the last

page R19 ok R20 AT+FDR Send page

T18 +fhs:0 Send one page done R21 +fhs:0 Receive one

T19 ok R22 ok

received OK

message

page done

We can now use the example to help explain the terminology for the fax command extensions.

Modes of Interaction

The modem has three modes of interaction: AT command mode, command execution mod e, and data transfer mode.

In AT command mode, serial data sent to the modem is interpreted as commands when preceded by the characters AT.

Command execution mode follows AT command mode when an action command, such as a dialing command, is sent to the modem. The modem responds to an action command by displaying responses that indicate the progress of the command and also information received from the remote fax modem. If serial data is received at that point, the fax is aborted and the phone call terminated.

Data transfer mode begins after a +FDT or +FDR command is entered from AT command mode, the command is executed, and a CONNECT response is given. When a +FDT command is used to enter data transfer mode, the serial data sent to the modem should be image data for the page being transmitted, as specified by the ITU-T T.4 standard. When a +FDR command is used to enter data transfer mode, the serial data received from the modem should be image data for the page currently being received.

AT Command Mode

In AT command mode, both regular AT commands and fax AT commands can be sent. Reg ular AT commands are used to control data modem functions and functions common to both modem and fax operation, such as dialing (ATD) and answering (ATA). Fax AT commands begin with the characters +F followed by a command name followed by either “?” if reading a parameter, “=” followed by a parameter value if setting a parameter, or “=?” if inquiring the valid values of a parameter. Any AT command that follows a fax AT command must be separated from it by a semicolon.

Fax AT command types. There are two types of fax AT commands: action commands and parameter commands. Action commands initiate a sequence of events that change command mode to command execution mode, and therefore do not execute instantaneously. Be cause of this mode change, an action command must be the last command in a command line. In contrast, parameter commands execute immediately; therefore more than one can appear in the same comm and line.

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Chapter 3 – Fax Class 2 Commands

Parameter command types. There are three types of parameter commands: set a parameter, read a parameter, and read the valid values for a parameter.

Note: When receiving fax responses from the modem, the state of the regular AT parameter V is important. If

verbose mode is enabled (set by issuing the ATV1 command), and then all responses will be preceded and followed by a <CR><LF> combination. If terse mode is enabled (set by issuing the ATV0 command), and then all responses will be followed by <CR> only. Also, regular AT responses are affected by the same V parameters (e.g., verbose response: OK, terse response: 1). All examples in this chapter assume verbose mode.

Responses. When a parameter is set, the response is OK if the parameter value is valid, and ERROR if the parameter value is invalid. When a parameter is read, the response has the following

format: +F<parameter_name>=<value>. When the valid values for a parameter are requested, the response is given as a valid parameter string as described below. When action commands are given, responses may be given to report the progress of the action command. For example, the ATD command may give the responses +FCO, +FIS:0,2,2,2,0,0,0,0 before the OK response is given.

Responses to action commands have the following format:

+F<parameter_name>:<value>

Parameter types. There are three types of parameters: numeric, character string, and compound. Numeric parameters are hexadecimal numbers in the range 0–FFh (0–255 decimal) or 0–FFFFh (0–

65535 decimal), depending on the parameter being set or read. Any number of leading zeros is permissible. A valid values string for numeric parameters consists of a list of numbers an d/or number ranges separated by commas. Number ranges consist of two values separated by a hyphen. For example, (A, 14-17, 1e) means the valid parameter values are Ah, 14h, 15h, 16h, 17h, and 1Eh (10, 20, 21, 22, 23, and 30 in decimal notation).

String parameters consist of a string of characters enclosed by double-quote characters. The string may not contain non-printable characters or double-quote characters. A valid values string for string parameters consists of a list of valid character values and character value ranges in hexadecimal format separated by commas and enclosed in parenthese s. For example, (20, 2b, 30-39) means the string can consist of the space character (20h), the plus character (2Bh), and the characters 0–9 (30h–39h).

Compound parameters consist of a list of numeric and string parameters separated by commas. For example, the compound parameter DIS consists of eight numeric parameters set by the followi ng command AT+FIS=n,n,n,n,n,n,n,n). It is possible to omit values from a compound parameter either by omitting values in the parameter string or by truncating the parameter string. For example, the command AT+FIS=,,2,0 sets only the third and fourth values of the DIS parameter an d leaves the rest unchanged. Note that when you omit leading parameters, you must leave their separation commas as placeholders, but trailing parameters and their commas can simply be omitted. It is possible to receive a compound parameter response from the modem that will have missing values. For example, the +FPS response sometimes has only two values (+FPS:1,1134) and other times has five values (+FPS:1,1134,30,4,0), depending on the setting of the +FCQ parameter). A valid values string for a compound parameter consists of a valid values string for each paramete r en closed in parentheses and separated by commas. Example: +FIS (0-1), (0-3), (0-4), (0-2), (0), (0), (0), (0-7).

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Chapter 3 – Fax Class 2 Commands

The following table illustrates how each of the parameter types is set or read, with typical respon ses.

Parameter type Set Read Read valid values

Numeric AT+FLP=1

String AT+FLI=”123”

Compound AT+FIS=,,2,0

AT+FLP? 1 ok

AT+FLI? ”123” ok

AT+FIS? 0,1,1,0,0,0,0,4 ok

AT+FLP=? 0,1 ok

AT+FLI=? (20) (32 -127) ok

AT+FIS=? (0-1), (0-3), (0-4), (0-2), (0), (0), (0-7) ok

Command Execution Mode

In command execution mode, responses indicate the progress of a n action command. Response format is the same as the format of a parameter that is read except that “=” following the parameter name is replaced by “:”. All action commands can be aborted by sending a single byte of serial data to the modem while it is in command execution mode. This not only aborts the command, but initiates the fax disconnect sequence.

Data Transfer Mode

Data transfer mode is entered after the CONNECT response is given (or a 1 response is given in terse mode). This is initiated by either a +FDT or +FDR action command.

When the connect response is initiated by a +FDT command, any data sent to the modem after the connect response is sent across the phone line to the receiving fax modem. This data is a compressed bit map for the page being transmitted. It must be formatted according to the ITU-T standard T.4 (or according to the T6 standard, in the case of MMR compression). When data is sent to the modem, single DLE characters (ASCII 10h) are replaced by two DLE characters, and, for Class 2 fax only, the end of the fax page is indicated by a DLE ETX sequence (ASCII 10h followed by ASCII 03h).

When data is sent to the modem, single DLE characters (ASCII 10h) are replaced by two DLE characters, and the end of the fax page is indicated differently in different fax standards:

in Class 2, end-of-page is indicated by a DLE ETX sequence (ASCII 10h followed by ASCII 03h); in Class 2.0 and Class 2.1, end-of-page is indicated by DLE-EOP (ASCII 10h ASCII 2Eh)

DLE-MPS (ASCII 10h ASCII 2Ch) DLE-EOM (ASCII 10h ASCII 3Bh)

When the connect response is initiated by a +FDR command, any data received from the mo dem after the connect response is data received from the transmitting fax modem. This data is a compressed bit map for the page being received, formatted according to ITU-T standard T.4 (or according to the T6 standard, in the case of MMR compression). When data is received from the modem, DLE DLE character sequences are replaced by a single DLE character. The DLE ETX character sequence indicates that the end of the fax page has been received.

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Chapter 3 – Fax Class 2 Commands

The baud rate between the host and the fax modem should be at least 20 percent faster than the negotiated baud rate at which the page is transmitted between fax modems. This is because the link between the fax modems is synchronous and the link between the host and the fax modem is asynchronous. Thus, when a fax page is transmitted, fewer bits are going out of the fax modem than are coming in (8 bits per character versus 10 bits per character). If the baud rates are the same or the host-to-fax modem baud rate is less, there will be errors in the fax page, because periodically the modem will run out of data to send. Therefore, the recommended baud rate between the host and the fax modem is at least 38400 bps, since the fastest fax modem to fax modem baud rate is between 14400 bps and 28800 bps, with the exact rate used depending on the modem mo del and configuration. The same logic applies when receiving fax page data.

The baud rate is set by the speed at which the dial command is given when originating a fax call, the speed at which the answer command is given when manually answering a fax call, or the speed at which the last command is received before automatically answering the call.

Since the baud rate should be set to a minimum of 38400 bps, flow control is required on transmitting so that no data is lost. Receive flow control may be required to accommodate delays in processing the received data.

When receiving a fax in a non-error-corrected fax co nnection, the host should not stop the data flow for long (using the selected flow control means) lest its internal buffers overflow. The local, receiving modem has no way to stop the data from the remote modem. Therefore, if its internal buffers overflow, data loss will occur. The host must send a DC2 character (ASCII 12h) after the connect response is received before the modem will transmit the received page data to the host.

The modem can cancel a page transmission by sending a CAN character (ASCII 18h) to the host. Upon receiving the CAN character the host should send the end of page sequence (DLE-ETX) to the modem.

There are two reasons why the modem might send a cancel to the host on page tran smission: First, the +FCT timeout may have occurred, which would result in a +FHS: response as the modem hung up. Second, the modem might cancel the host because it has sent enough lines for the negotiated page length. The host can also cancel page reception by sending a CAN to the modem, to which the modem will respond by sending a DLE ETX to the host and then display a +FHS: response a s the modem hangs up.

If you are sending data in Class 2.0/2.1 with format conversions enabled (see Format Conversion +FFC), then you must specify the format of the data for each image parameter that is different the negotiated parameters. You must specify the data in the form of DLE sequences before the image is sent or between each image segment. The table below indicates what sequences should be sent for different image parameters.

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Chapter 3 – Fax Class 2 Commands

If you are using Class 2 format, this information is provided through the use of the AT+FDT command with its optional parameters.

Fax Parameter DLE Character to Precede

Image Data

fax page width, 2048 pixels 67h fax page width, 2432 pixels 68h fax page width, 1216 pixels 69h fax page width, 864 pixels 6Ah data compression, MH 6Bh data compression, MR 6Ch data compression,

uncompressed

6Dh

* not supported vertical resolution, standard 61h vertical resolution, fine 62h fax page length, A4 63h fax page length, B4 64h fax page length, unlimited 65h fax page with, 1728 pixels 66h data compression, MMR 6Fh

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Chapter 3 – Fax Class 2 Commands

Commands and Responses Overview

This chapter describes three kinds of commands and responses: Action commands. Action commands initiate a sequence of events that do not execute instantaneou sly,

and therefore change command mode to command execution mode. An action command must be the last command in a command string.

Responses. Responses are result code messages sent to the host by the modem.

Note: Older MultiModem II modems, those with model numbers MT2834xx and lower, respond with

the parameter name as a prefix to the value of the parameter value when a parameter value or range of values is queried.

For example: AT+FCLASS=2 Response Returned: +FCLASS=2 OK

The command name as prefix can be omitted by setting the +FV option to zero (see Phase C Data Format Parameters). If the command name prefix is omitted, then the response returned would simply be 2.

Parameters. Parameter commands set operating conditions. Multiple parameter commands can be sent in a command string; however, semicolons must separate them. All action commands and responses are mandatory. Some parameter commands are mandatory, but others are optional. Mandatory values are specified for each command an d parameter.

Action Commands

Class 2.1 Class 2 Action description

+FDR +FDR Begin or continue Phase C data reception* +FDT +FDT Begin or continue Phase C data transmission +FET End page or document command +FIP Initialize Class 2.0/2.1 parameters command +FKS +FK Terminate session command—orderly fax abort

* Depends on the capability to receive set by +FCR.

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Chapter 3 – Fax Class 2 Commands

Modem Responses

Class 2.1 Class 2 Response description

+FCFR Confirmation to Receive prompt +FCO +FCON Facsimile connection +FDM Transition to data modem operation +FVO +FVOICE Transition to voice operation +FCS: +FDCS: Report negotiated session parameters, DCS frame information +FIS: +FDIS: Report remote capabilities, DIS frame information +FTC: +FDTC: Report remote capabilities, DTC frame information +FPO +FPOLL Remote polling request indication +FTI: +FTSI: Report remote ID, TSI +FCI: +FCSI: Report remote ID, CSI +FPI: +FCIG: Report remote ID, CIG +FNF: +FNSF: Report received NSF frame +FNS: +FNSS: Report received NSS frame +FNC: +FNSC: Report received NSC frame +FSA: Destination subaddress +FPA: Selective polling address +FPW: Password (sending or polling) +FFD: File diagnostic message +FET: +FET: Post page message report +FPS: +FPTS: T.30 Phase C page transfer status report (post page responses) +FHS: +FHNG: Call termination status +FHR: +FHR: Report received HDLC frame +FHT: +FHT: Report transmitted HDLC frame +FPS: +FPTS: T.30 Phase C page reception +FV= Prefix output on query response

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Chapter 3 – Fax Class 2 Commands

Parameters for Mandatory Services

Class 2.1 Class 2 Mandatory parameter description

+FCLASS= +FCLASS= Service class selection +FBO= +FBOR= Phase C data bit order (optional parameter in Class 2) +FCC= +FDCC= Set modem capabilities +FCQ= +FCQ= Copy quality checking (optional parameter in Class 2)* +FIS= +FDIS= Set current session capabilities +FCS? +FDCS? Current session results (read only) +FEA= +FREL= Phase C Received EOL alignment (optional parameter in Class 2)* +FLI= +FLID= Local fax station ID string, TSI or CSI +FPI= +FCIG= Local fax station polling ID string, CIG +FSP= +FSPL= Request to poll* +FLP= +FLPL= Indicate document to poll +FPS= +FPTS= Page transfer status* +FFD= File diagnostic message +FHS? Call termination status +FIE= Procedure interrupt enable +FIT= host inactivity timer +FNR= Negotiation message reporting control +FPA= Selective polling address +FSA= Subaddress +FPP= Packet protocol control +FPW= Password (sending or polling) +FLO= +FLO= Set local flow control +FPR= Set local port rate +FMI? +FMFR? Request modem manufacturer +FMM? +FMDL? Request modem model +FMR? +FREV? Request modem revision

* Depends on the capability to receive set by +FCR.

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Chapter 3 – Fax Class 2 Commands

Parameters for Optional Services

Class 2.1 Class 2 Optional parameter description

+FAA= +FAA= Adaptive answer mode +FAP= Addressing & polling capabilities +FBADLIN= Number of consecutive bad lines for a bad page +FBADMUL= Error threshold multiplier +FBS? +FBUF? Buffer size, read only +FBU= +FBUG= HDLC frame reporting enable +FCR= +FCR= Capability to receive +FCT= +FPHCTO= host Phase C timeout

+FFC=

+FMS= +FMINSP= Minimum Phase C speed +FND= Non-standard message data indication +FNS= Non-standard frame FIF +FRQ= Receive quality thresholds +FRY= +FCTCRTY CTC/ECM retry value +FAXERR= Fax error value +FRBOR Set receive Bit Order to Rockwell/Lucent order. * +FV Display prefix on parameter queries.*

+FDFFC= Data compression format conversion +FLNFC= Page length format conversion +FVRFC= Vertical resolution format conversion +FWDFC= Page width format conversion

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Identification Commands

Service Class Indication

A MultiModem modem will report its Service Class capabilities, both the current setting an d the range of services available. This is provided by the +FCLASS parameter. Currently-defined values for the +FCLASS parameter are:

Parameter Service Class

0 Data modem 1 Fax Service Class 1 (TIA-578, ITU-T.31)

1.0 Fax Service Class 1.0 (ITU-T T.31, Amendment 1) 2 Fax Service Class 2 (EIA 29.2)

2.0 Fax Service Class 2.0 (ITU-T T.32)

2.1 Fax Service Class 2.1 (ITU-T T.32 Amendment 1) 3-7 Reserved (not supported) 8 Voice modem 9-255 Reserved (not supported) [None] Not supported

The +FCLASS factory default setting is +FCLASS=0. When +FCLASS is set to other than 0 and a call is made, but the call fails or the modem is disconnected, the +FCLASS value returns to the default setting (+FCLASS=0).

Class 2.1 +FCLASS?

A modem’s current Service Class setting is tested by the +FCLASS? command. The response is a single value.

Class 2 +FCLASS?

Same as Class 2.1.

Service Class Capabilities

Class 2.1 +FCLASS=?

The Service Classes available from a modem are tested by the +FCLASS=? command. The response is a string o f values separated by commas. A Cla ss 2.1 MultiModem can respond:

Example: <CR><LF>0,1,2,1.0,2.0,2.1,8<CR><LF>OK<CR><LF>.

Class 2 +FCLASS=?

A Class 2 MultiModem responds similarly; however, older Multi-Tech modems that do not support Class 2.1 report fewer options.

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Chapter 3 – Fax Class 2 Commands

Service Class Selection

Class 2.1 +FCLASS=<value>

The Service Class may be set by the host from the above choices using the +FCLASS=<value> command. Once the result code is received from the mode m.

Class 2 +FCLASS=<value>

Same as Class 2, except for the +FPR command. In Class 2, the serial port rate is set by the speed at which the dial command is given when originating a fax call, the speed at which the answer command is given when manually a nswering a fax call, or the speed at which the last command is received before automatically answering the call.

Request Manufacturer Identification

Class 2.1 +FMI?

The +FMI? command executes the V.25ter +GMI? command to request the name of the modem’s manufacturer.

Example: AT+FMI?

Multi-Tech Systems OK

Class 2 +FMFR?

The +FMFR? command requests the name of the modem’s manufacturer.

Request Model Identification

Class 2.1 +FMM?

The +FMM? command executes the V.25ter +GMM? command to request the

modem’s model number.

Example: AT+FMM?

MT5634ZBA-V92 OK

Class 2 +FMDL?

The +FMDL? command requests the modem’s model number.

Request Revision Identification

Class 2.1 +FMR?

The +FMR? command executes the V.25ter +GMR? command to request the modem’s firmware revision number.

Example: AT+FMI?

-----------OK

Class 2 +FREV?

The +FREV? command requests the modem’s model number.

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Action Commands

Action commands transfer data and punctuate sessions. They also release spe c ific T.30 messages. An action command with a terminating carriage return character, <CR>, in the syntax specification

must be the last command on a command line. Subsequent commands on the same line as one of these action commands will be ignored.

All action commands initiate processes. The modem does not accept other commands from the host 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 other than an immediate <LF> character, flow control characters (<DC1> or <DC3>), or other characters defined for that command.

Originate a Call

Class 2.1 ATD

Syntax: ATD[<dial string>]<CR> or ATD[<dial string>];<valid commands><CR>

All Multi-Tech MultiModems support the D command to originate a call. This Originate command is documented in the MultiModem User Guide.

Class 2 ATD

Same as Class 2.1.

Answer a Call

Class 2.1 ATA

Syntax: ATA <CR>

The Answer command is documented in the MultiModem User Guide. If the Answer command is unsuccessful, the MultiModem reports an appropriate

failure or error type result code, such as NO CARRIER. If configured to do so by the +FAA parameter, the modem may adaptively answer as

a fax modem or as a data modem. If the modem answers as a data modem, it resets the +FCLASS parameter to 0, and issues appropriate final result codes (e.g. CONNECT, NO CARRIER) to the host.

Class 2 ATA

Same as Class 2.1.

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Data Transmission

Class 2.1 +FDT

Syntax: +FDT<CR>

The FDT command requests the modem to transmit a Phase C page. It is issued at the beginning of each page, either in Phase B or in Phase D. When the modem is ready to accept Phase C data, it issues the negotiation responses and the CONNECT result code to the host. Negotiation responses are controlled by the +FNR subparameters.

In Phase B, the +FDT command releases the modem to proceed with negotiation, and to release the DCS message to the remote station. In Phase D, the +FDT command resumes transmission after the end of a previous page.

Class 2 +FDT

Syntax: +FDT[=DF,VR,WD,LN]<CR>.

Post-Page Message Release

Class 2 +FET=n

This command releases the post-page message to the remote modem. The possible values for n are listed in the table below.

n = Symbol Description

0 MPS Multi-Page Signal 1 EOM End of Message 2 EOP End of Page 4* PRI-MPS Multi-Page Signal, with procedure interrupt 5* PRI-EOM End of Message, with procedure interrupt 6* PRI-EOP End of Procedure, with procedure interrupt

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Data Reception

Class 2.1 +FDR

Syntax: +FDR<CR>

The +FDR command initiates transition to Phase C data reception. This can occur after answering, after dialing, after a document is received, or after a page is received.

The modem may report the negotiated T.30 parameters with the remote ID and NSS frame information, if available. When the modem is ready to commence data transfer, it will issue a CONNECT response code. After the host receives the CONNECT response and the host is ready to accept data, it will issue a <DC2> character (12h) to the modem.

Class 2 +FDR

Same as Class 2.1.

Session Termination

Class 2.1 +FKS

Syntax: +FKS

The +FKS command causes the modem to terminate the session in an orderly manner by sending a DCN message at the next opportunity and hanging up. At the end of the termination process, the modem will report the +FHS response with a result code, go on-hook, and set +FCLASS=0.

This operation can also be invoked by using the <CAN> (cancel) character during Phase C data reception.

Class 2 +FK

Syntax: +FK

Essentially the same as Class 2.1.

Initialize Facsimile Parameters

Class 2.1 +FIP

Syntax: +FIP

The +FIP command causes the modem to initialize all Service Class 2.0/2.1 facsimile parameters to the default settings. This command does not change the setting of +FCLASS. It has the same effect as if the host had issued individual parameter setting commands.

MultiModem modems do not support multiple profiles, and thus do not support the optional +FIP=<value> syntax documented in T.32.

Class 2 There is no equivalent command in Class 2.

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Modem Responses

The modem sends information responses to the host as a facsimile session proceeds. Responses convey needed information and indicate the state of the facsimile sessi on. These responses are solicited messages, generated in execution of host action commands described in Action Commands section.

The modem precedes all of the following information responses with <CR><LF>, and follow them with <CR><LF> if in verbose mode (ATV1) or follow them with just a <CR> if in terse mode (ATV0).

T.30 Phase A Negotiation Responses

Facsimile Connection Response

Class 2.1 +FCO

Syntax: +FCO

The +FCO response indicates connection with a Grou p 3 facsimile station. It is released by detection of HDLC flags in the first received frame. +FCO is generated in response to an Originate command (2.3.1) or an Answer command (2.3.2).

Class 2 +FCON

Syntax: +FCON

The Class 2 response is essentially the same as the Class 2.1 response.

Transition to Data Modem, +FDM

Class 2.1 +FDM

Syntax: +FDM

The +FDM response indicates that the modem has identified that the calling device is a data modem. The modem issues this response immediately upon recognition of a data modem. The +FDM response precedes any data modem information text or result codes.

Class 2 There is no equivalent response in Class 2.

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T.30 Phase B Negotiation Responses

The modem will provide the on-line status of several session parameters when they are available in the T.30 handshaking and if enabled via the +FNR subparameters. These include the remo te ID string and the DIS/DCS/DTC parameters.

Report DIS/DCS/DTC Frame Information

Class 2.1 +FCS:, +FIS:, +FTC:

Syntax: +FCS:VR,BR,WD,LN,DF,EC,BF,ST,JP Current Session Syntax: +FIS:VR,BR,WD,LN,DF,EC,BF,ST,JP Remote Identification Syntax: +FTC:VR,BR,WD,LN,DF,EC,BF,ST,JP Request for Polling

T.32 reference: 8.4.2.1 These responses report the T.30 session parameter frame s. The subparameters are described in Table 3.5.

+FCS:<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.

+FIS:<string> and +FTC:<string> report remote facsimile station capabilities and intentions. If the remote has a document to poll, a +FPO response will trail +FIS:<string>; if the remote station wants to poll, the +FTC:<string> response is generated. These messages are generated in execution of Originate, Answer, +FDT and +FDR commands.

Class 2 +FDCS:, +FDIS: +FDTC:

Syntax: +FDCS:VR,BR,WD,LN,DF,EC,BF,ST Current Session Syntax: +FDIS:VR,BR,WD,LN,DF,EC,BF,ST Remote Identification Syntax: +FDTC:VR,BR,WD,LN,DF,EC,BF,ST Request for Polling

The Class 2 responses are essentially the same as the Class 2.1 responses, except that Class 2 lacks the JP subparameter, and the sets of values supported for each sub-parameter is a subset of class 2.1 values. See table 3.5 for more information.

Remote Polling Indication

Class 2.1 +FPO

Syntax: +FPO

T.32 reference: 8.4.2.2 The +FPO response indicates that the remote station has a document to poll and invites the host to poll it. This response is generated in execution of Originate) Answer), +FDT) and +FDR) commands. +FSP=0 inhibits the +FPO response (2.5.1.9).The host may respond to an +FPO message with either the begin transmit command, AT+FDT, if it does not wish to poll, or the +FDR command, to indicate willingness to poll the remote station.

Class 2 +FPOLL

Syntax: +FPOLL

The Class 2 response is essentially the same as the Class 2.1 response.

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Report Remote ID

Class 2.1 +FTI:, +FCI:, +FPI:

Syntax: +FTI:”<TSI ID string>” Transmit Station ID Syntax: +FCI:”<CSI ID string>” Called Station ID Syntax: +FPI:”<CIG ID string>” Polling Station ID

These responses report the received remote ID string, if any. They are generated in execution of the Originate, Answer, +FDT, and +FDR commands.

The modem reports the characters in the ID string in reversed time order from the order received from the remote station. For example, if the following ID FIF character string were received (hexadecimal values):

<20><20><20><20><20><31><30><39><38><20><37><36><35><20><34><33> <32><20><31><2B> The result would be: <CR><LF>+FCI:"+1 234 567 8901 "<CR><LF>

Class 2 +FTSI:, +FCSI:, +FCIG:

Syntax: +FTSI:”<TSI ID string>” Transmit Station ID Syntax: +FCSI:”<CSI ID string>” Called Station ID Syntax: +FCIG:”<CIG ID string>” Polling Station ID

The Class 2 responses are essentially the same as the Cla ss 2.1 responses.

Report Non-Standard Negotiation Frames

Class 2.1 +FNF:, +FNS:, +FNC:

Syntax: +FNF:<NSF FIF string> Non-Standard Facilities Syntax: +FNS:<NSS FIF string> Non-Standard Setup Syntax: +FNC:<NSC FIF string> Non-Standard Commands

These responses report received non-standard negotiation frames, one response per frame. These responses are generated in execution of the Originate, Answer, +FDT, and +FDR commands.

The NSF Facsimile Information Field (FIF) frame octets are presented in hex notation, and are separated by spaces. Flags and zero bits are removed. Frame octets are rep orted in the order received. For each frame octet the LSB is the first bit sent or received.

Class 2 +FNSF:, +FNSS:, +FNSC:

Syntax: +FNSF:<NSF FIF string> Non-Standard Facilities Syntax: +FNSS:<NSS FIF string> Non-Standard Setup Syntax: +FNSC:<NSC FIF string> Non-Standard Commands

The Class 2 responses are essentially the same as the Cla ss 2.1 responses.

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Report Addressing or Password Strings

Class 2.1 +FSA:, +FPA:, +FPW:

Syntax: +FSA:"" Destination Subaddress Syntax: +FPA:"<SEP string>" Polling Address Syntax: +FPW:"<PWD string>" Polling Password

These responses report the received Addressing or Password string, if any. Originate, Answer, +FDT or +FDR command execution may generate these responses, if the corresponding frames are received.

If the corresponding subparameter in the +FAP parameter is set, the modem shall report the characters in these strings in reversed time order from the order received from the remote station. For example, if the following hexadecimal Subaddress string is received:

<39><38><37><36><35><34><33><32><31><30><39><38><37><36><35><34> <33><32><31><30>

The result would be: <CR><LF>+FCI:"01234567890123456789"<CR><LF>

Class 2 There are no equivalent responses in Class 2.

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Chapter 3 – Fax Class 2 Commands

T.30 Phase C Page Reception Responses

Receive Page Transfer Status

Class 2.1 +FPS:

Syntax: +FPS:<ppr>,<lc>,<blc>,<cblc>,<lbc>

The +FPS:<ppr> response is generated by the modem at the end of Phase C data reception in execution of a +FDR command.

The <ppr> response is generated by the modem; it depends on the modem for T.4 or T.6 error checking capabilities, controlled by the +FCQ parameter. See Table 3.0 for <ppr> values.

The receiving modem may count lines and bad lines and report them. Values are: <lc> line count <blc> bad line count <cblc> consecutive bad line count <lbc> lost byte count due to modem buffer o verflow

The line counts are qualified by the modem’s copy checking capabilities, controll ed

by the +FCQ parameter. If the modem is not configured to count lines, or if line

counts are irrelevant (e.g. in Binary File Transfer mode, Recommendation T.434) the

modem sets the line counts to 0.

A receiving host may inspect <ppr> and write a modified value into the +FPS

parameter. The modem will hold the corresponding post page response message

until released by a +FDR command from the host.

Table 3.0 Class 2.1 T.30 Post Page Response Message Codes

Value Mnemonic Description

1 MCF Page good. 2 RTN Page bad; retrain requested. 3 RTP Page good; retrain requested. 4 PIN Page bad; retrain requested; interrupt request accepted. 5 PIP Page good; interrupt request accepted.

Class 2 +FPTS:

Syntax: +FPTS:<ppr>,<lc>[,<blc>,<cblc>][,<lbc>]

The Class 2 response is similar to the Class 2.1 response, except that it may also

use <ppr> codes 0, 6, and 7, which are not used in the Class 2.1 response.

Table 3.1 Class 2 T.30 Post Page Response Message Codes

Value Mnemonic Description

0 PPR Partial page errors. 1 MCF Page good. 2 RTN Page bad; retrain requested. 3 RTP Page good; retrain requested.

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T.30 Phase D Post Page Responses

Post Page Message

Class 2.1 +FET:

Syntax: +FET:<ppm>

The +FET:<post page message> response is generat ed by a receiving facsimile

modem at 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 correspond to the T.30 post page messages as

described in Table 3.1.

Table 3.2 Class 2.1 Post Page Message Codes

PPM code T.30 mnemonic Description

0 MPS Another page next, same document 1 EOM Another document next 2 EOP No more pages or documents

Class 2 +FET:

Syntax: +FET:<ppm

The Class 2 response is similar to the Class 2.1 response, except for the different

<ppm> codes described in Table 3.1.

Table 3.3. Class 2 Post Page Message Codes

PPM code T.30 mnemonic Description

0 MPS Another page next, same document 1 EOM Another document next 2 EOP No more pages or documents 3 PPS-NULL Another partial page next 4 PRI-MPS Another page, procedure interrupt 5 PRI-EOM Another document, procedure interrupt 6 PRI-EOP All done, procedure interrupt

Call Termination with Status

Class 2.1 +FHS:

Syntax: +FHS:<hangup status code>

+FHS: indicates that the call has been terminated. The hang-up cause is reported,

and stored in the +FHS parameter for later inspection. The <hsc> values are

hexadecimal codes as described in Table 3.4.

+FHS:<hsc> is a possible intermediate result code to any host action command

described in Action Commands section. It is always followed by the OK result code.

Class 2 +FHNG:

Syntax: +FHNG:<hangup status code>

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The Class 2 response is the same as the Class 2.1 response except that the hang-up

cause is stored in the +FAXERR parameter and the <hsc> values are decimal codes

as described in Table 3.4.

Table 3.4. Hang-up Status Codes

Class 2.1 Class 2 Cause

00–0F 0–9 Call placement and termination:

00 0 Normal and proper end of connection 01 1 Ring detect without successful handshake 02 2 Call aborted from +FKS [FK] or <CAN> 03 3 No Loop Current 04 - Ringback detected, no answer (timeout) 05 - Ringback detected, answer without CED

10–1F 10–19 Transmit Phase A & miscellaneous errors

10 10 Unspecified Phase A error 11 11 No Answer (T.30 T1 timeout)

20–3F 20–39 Transmit Phase B hang-up codes

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

40–4F 40–49 Transmit Phase C hang-up codes

40 40 Unspecified transmit Phase C error 41 - Unspecified image format error 42 - Image conversion error 43 43 host to modem data underflow 44 - Unrecognized transparent data command 45 - Image error, line length wrong 46 - Image error, page length wrong 47 - Image error, wrong compression code

50–6F 50–69 Transmit Phase D hang-up codes

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

70–8F 70–89 Receive Phase B hang-up codes

70 70 Unspecified receive Phase B error

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Class 2.1 Class 2 Cause

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

90–9F 90–99 Receive Phase C hang-up codes

90 90 Unspecified receive Phase C error 91 91 Missing EOL after 5 seconds 92 - Bad CRC or frame (ECM mode) 93 93 modem to host buffer overflow

- 94 Bad CRC or frame (ECM or BFT mode)

A0–BF 100–119 Receive Phase D hang-up codes

A0 100 Unspecified receive Phase D errors A1 101 RSPREC invalid response received A2 102 COMREC invalid response received

A3 103 Unable to continue after PIN or PIP C0–DF 120–255 Reserved for future standardization E0–FF - Reserved for manufacturer-specific use

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Parameter Commands

All Class 2 parameters can be read, written, and tested for the range of legal values by the modem. The general syntax is described in the AT Command section of this Chapter.

T.30 Session Parameters

Group 3 fax devices negotiate session parameters in the DIS, DCS and DTC frames. The following parameters are provided to condition the fax modem for the capabilities it will offer, and to report the negotiated session settings.

The three primary T.30 session parameters are +FCC [FDCC], +FIS [FDIS] and +FCS [FDCS] , described in 2.5.1.1–2.5.1.3. These are compound parameters using values listed in Table 3.5. The Figure below illustrates their relationships:

DT E Write DT E Read

DT E Write DT E Report DT E Read

DT E Write DT E Read

+FCC DCE Capabilities

Cold

Write

Start

+FDCC

+FIS DC E N e g o t ia t i n g Position

0,0,0,0,0,0,0,0

Cold

End of

Start

Session

+F CS Ne g otiated Session Parameters

End of Session

T.30 session parameters

Modem Capabilities Parameters

Class 2.1 +FCC=

Write Syntax: +FCC=VR,BR,WD,LN,DF,EC,BF,ST,JP Values: See Table 3.5 Default: 1,5,0,2,0,0,0,0

+FCC allows the host to sense and constrain the capabilities of the facsimile modem, from the choices defined in ITU-T T.30. When +FCC is modified by the host, the modem will copy +FCC into +FIS.

Note: The Multi-Tech implementation does not include the T.32 subparameter WD 3

and 4 values or the EC 2 and 3 values; also, for subparameter BF only the 00 value is implemented.

DIS /DTC if r eceiv e

Virtu al DI S on send

On send, determine DC S in fa x DC E

DCS if send

Remote DCS on receive

DIS/DTC from remote stati on

Class 2 +FDCC=

Write Syntax: +FCC=VR,BR,WD,LN,DF,EC,BF,ST Values: See Table 3.5. Default: 1,5,0,2,0,0,0,0

The Class 2 parameter is essentially the same as the Class 2.1 parameter except that it lacks the JP subparameter, and the modem copies +FDCC into +FDIS.

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Current Sessions Parameters

Class 2.1 +FIS=

Write Syntax: +FIS=VR,BR,WD,LN,DF,EC,BF,ST,JP Values: See Table 3.5 Default: 1,3,2,2,0,0,0,0,0

The +FIS parameter allows the host to sense and constrain the capabilities used for the current session. The modem uses +FIS to generate DIS or DTC messages directly, and uses +FIS and received DIS messages to generate DCS messages.

The modem sets the +FIS parameter from the +FCC parameter on initialization, when +FCC is written, and at the end of a session.

Class 2 +FDIS=

Write Syntax: +FCC=VR,BR,WD,LN,DF,EC,BF,ST Values: See Table 3.5 Default: 1,3,2,2,0,0,0,0

The Class 2 parameter is essentially the same as the Class 2.1 parameter except that it lacks the JP subparameter, and the +FDIS parameter is set from the +FDCC parameter.

Current Session Results

Class 2.1 +FCS?

Read syntax: +FCS? Response: VR,BR,WD,LN,DF,EC,BF,ST,JP Values: See Table 3.5 Default: 0,0,0,0,0,0,0,0,0

The +FCS parameter is loaded with the negotiated T.30 parameters for the current session. A transmitting modem generates DCS; a receiving modem gets DCS from the remote station. The host may only read this parameter.

The +FCS parameter is set to 0,0,0,0,0,0,0,0 on initialization, on +FIP command execution, and at the beginning of a session. If the host issues a +FCS? command in the initial state, the modem will report: <CR><LF>0,0,0,0,0,0,0,0<CR><LF>

The contents of +FCS are spontaneously reported during e xe cutio n of +FDR (2.3.5) or +FDT (2.3.3) commands by the +FCS:VR,BR,WD,LN,DF,EC,BF,ST,JP response, using the same compound parameter format. See T.30 Phase B Negotiation

Responses section.

Class 2 +FDCS?

Read syntax: +FDCS? Response: +FDCS=VR,BR,WD,LN,DF,EC,BF,ST or: +FDCS= Values: See Table 3.5 Default: 0,0,0,0,0,0,0,0

The Class 2 parameter is essentially the same as the Class 2.1 parameter except that the response lacks the JP subparameter.

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T.30 Session Subparameters

Several commands and responses reference T.30 session negotiated parameters. These are described by a set of common subparameters, which are described in Table 3.5. Optional parameter values are marked with an asterisk (*).Unspecified parameter values are reserved for future use.

The +FCC [+FDCC], +FIS [+FDIS], and +FCS [+FDCS] compound parameters, described in Parameter Commands sections, use these session subparameters. On writes, unspecified subparameters are unchanged.

The +FIS: [+FDI S:], +FCS: [+FDCS:], and +FTC: [+FDTC:] session report respon ses, described in T.30 Phase B Negotiation Responses section, also use these subparameters.

For test response, ranges of values are reported for each subparameter, enclosed in parentheses characters. For example, a modem response to +FCC=? [+FDCC=?] could report:

Example: +FIS=0,3,0,2,0,0,0,1,0 is interpreted as follows:

Value Label Description

0 VR 98 dpi vertical resolution 3 BR 9600 bit/s 0 WD 1728 pixels 2 LN unlimited length 0 DF 1-D modified Huffman coding 0 EC no ECM 0 BF no BFT 1 ST 5 ms scan time 0 JP no JPEG

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Table 3.5. T.30 Session Subparameter Codes

Note: Class 2.0/2.1 is shown in hexadecimal values. Class 2 is shown is decimal values.

Label Function Class 2.0/2.1 Class 2 Description

VR Vertical

resolution

(Note 1)

Bit rate

(Note 2)

V.34 bit rate (Class 2.1 only)

WD Page width in

pixels

LN Page length 0h

DF Data

compression format

EC Error

correction, T.30

BF Binary file

transfer

ST Scan time/line

00h 01h *02h *04h *08h *10h *20h *40h *Class 2.1 only

0h 1h 2h 3h 4h 5h

6h 7h 8h 9h Ah Bh Ch Dh Class 2.1 only

Eh Reserved Reserved

0h 1h 2h

1h 2h

0h 1h 3h

1h 00h 0 Disable file transfer modes

0h 1h 2h 3h 4h 5h 6h 7h

0 1 R8 × 3.85 l/mm, (98 dpi) Normal

R8 × 7.7 l/mm, (196 dpi) Fine R8 × 15.4 l/mm R16 × 15.4 l/mm 200 dpi × 100 l/25.4 mm 200 dpi × 200 l/25.4 mm 400 dpi × 400 l/25.4 mm 300 dpi × 300 l/25.4 mm

+FCC/+FIS description 2 400 bit/s preferred

4 800 bit/s preferred

7 200 bit/s preferred

9 600 bit/s preferred

12 000 bit/s preferred 14 400 bit/s preferred all with V.8 optional

16 800 bit/s preferred

19 200 bit/s preferred 21 600 bit/s preferred 24 000 bit/s preferred 26 400 bit/s preferred 28 800 bit/s preferred 31 200 bit/s preferred 33 600 bit/s preferred all with V.8 implied

R8 R16 200 300 400 d/mm d/mm dpi dpi dpi 1728 3456 1728 2592 3456

2048 4096 2048

2432 4864 2432

A4, 297 mm

B4, 364 mm

Unlimited length

1-D modified Huffman (T.4)

2-D modified read (T.4)

2-D modified read (T.6)

Disable ECM

64-byte frames, Annex A/T.30

256-byte frames, Annex A/T.30

0 1 2 3 4 5 6 7

VR = 0

0 ms

5 ms 10 ms 10 ms 20 ms 20 ms 40 ms 40 ms

+FCS description 2 400 bit/s selected 4 800 bit/s selected 7 200 bit/s selected 9 600 bit/s selected 12 000 bit/s selected 14 400 bit/s selected

16 800 bit/s selected 19 200 bit/s selected 21 600 bit/s selected 24 000 bit/s selected 26 400 bit/s selected 28 800 bit/s selected 31 200 bit/s selected 33 600 bit/s selected

VR > 0

0 ms 5 ms

5 ms 10 ms 10 ms 20 ms 20 ms 40 ms

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Label Function Class 2.0/2.1 Class 2 Description

JP JPEG for

color and B&W

(Note 2)

Notes:

1 For subparameter VR, values 00, 01, 02, 04, 08, 10, 20 and 40 (hexadecimal) indicate a single choice; they are the only values

allowed in the +FCS parameter and +FCS: report. All values that are sums of these values shall only be used to indicate multiple capabilities; these are allowed in +FIS and +FCC parameters. For example, value 07 (01 + 02 + 04) would indicate capability for all metric-based resolutions.

2 For subparameter JP, values 00, 01, 02, 04 08, 10, 20 and 40 (hexadecimal) indicate a single choice. All values that are sums of

these values shall only be used to indicate multiple capabilities in +FIS and +FCC subparameters and to indicate the choice in the +FCS subparameter. For example, to indicate support for JPEG, full color mode ,and no subsampling, the host should set the JP subparameter to 01 + 02 + 10 = 13h. If one or several of the values 02h to 40h are not used, that means that the default value for the subparameter (e.g. respectively: gray-scale, custom Huffman tables, 8 bit/pel/component, 4:1:1 subsampling ratio, D50 illuminant, default gamut range) is used, as defined in Annex E/T.30 and Annex G/T.4.

3 The modem ignores this value in •FCC and in •FIS when generating DIS or DTC frames.

00 01 02 04 08 10 20 40

Disable JPEG coding

Enable JPEG coding (T.81) Full color mode Enable preferred Huffman tables (Note 3) 12 bits/pel/component No subsampling (1:1:1) Custom illuminant Custom gamut range

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Local ID String

Class 2.1 +FLI

Write syntax: +FLI=”<local ID string>” Values: 20-character printable ASCII string Mandatory values: 20-character string, Table 3/T.30 Default: Null String

The modem generates a TSI or CSI frame if FLI is not a Null String. Table 3/T.30 includes digits 0–9, the + character, and the space character.

The modem transmits ID string characters to the remote station in reversed time order from the order in the command line. For example, if the command line

AT+FLI="+1 234 567 8901"<CR> is issued, the modem would send a CSI or TSI rame with FIF (hexadecimal) consisting of

<20><20><20><20><20><31><30><39><38><20><37><36><35><20><34> <33><32><20><31><2B>

If less than 20 characters are specified in a non-Null String, the modem appends space characters (<20>). If the specified string is more than 20 characters in length, an ERROR result code is generated.

Class 2 +FLID

Write syntax: +FLID=”<local ID string>” Valid values: 20-character printable ASCII string Mandatory values: 20-character string, Table 3/T.30 Default value: Null String

The Class 2 parameter is essentially the same as the Class 2.1 param eter.

Local Polling ID String

Class 2.1 +FPI

Write syntax: +FPI=”<local polling ID string>” Values: 20-character printable ASCII string Mandatory Values: 20-character string, Table 3/T.30 Default: Null String

The modem generates a CIG frame if FPI is not a Null String. CIG is used in polling sessions. Table 3/T.30 includes digits 0–9, the + character, and the space character.

Like the +FLID command, the modem transmits ID string characters to the remote station in reversed order from the order in the command line.

Class 2 +FCIG

Write syntax: +FCIG=”<local ID string>” Values: 20-character printable ASCII string Mandatory Values: 20-character string, Table 3/T.30 Default: Null String

The Class 2 parameter is essentially the same as the Class 2.1 param eter.

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Non-standard Frame FIF Octet String

Class 2.1 +FNS

Write syntax: +FNS="< hexadecimal-coded octet strin g>" Values: up to 90 octets Default: Null String

If +FNS is not a Null String, the modem sends the corresponding non-standard facilities frame. The type of frame is determined by the type of negotiation frame to be sent: NSF sent with DIS; NSS sent with DCS; NSC sent with DTC.

The modem only delivers the data; the host must determine the content. The first octet must be the country code (see Recommendation T.35).

Class 2 There is no equivalent parameter in Class 2.

Indicate Document to Poll

Class 2.1 +FLP

Write syntax: +FLP=<value> Values: 0, 1 Default: 0

+FLP=0 The host has no document to poll. +FLP=1 The host has a document ready for polling. The modem reports this to the

remote station in the DIS frame. The modem resets this parameter to 0 after a polled document is sent.

Class 2 +FLPL

Write syntax: +FLPL=<value> Values: 0, 1 Default: 0

The Class 2 parameter is the same as the Class 2.1 parameter except for the name.

Request to Poll

Class 2.1 +FSP

Write syntax: +FSP=<value> Values: 0, 1 Default: 0

+FSP=0 The host does not want to poll. +FSP=1 The host can receive a polled document. The modem resets this parameter

Class 2 +FSPL

Write syntax: +FSPL=<value>

Values: 0, 1

Default: 0

The Class 2 parameter is the same as the Class 2.1 parameter except for the name.

to 0 after a polled document is received.

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Capability to Receive

Class 2.1 +FCR

Write syntax: +FCR=<value> Values: 0, 1 Default: 0

+FCR=0 The modem will not receive message data; also, the modem will not be

able to poll a remote device. This can be used when the host has insufficient storage, or if the modem does not have a Phase C (V.27ter,

V.29) demodulator. The modem can send and can be polled for a file. +FCR=1 The modem can receive message data. +FCR is sampled in ITU T.30 Phase B and Phase D.

Class 2 +FCR

Write syntax: +FCR=<value> Values: 0, 1 Default: 0

The Class 2 parameter is identical to the Class 2.1 parameter.

Session Message Reporting

Class 2.1 +FBU

Write syntax: +FBU=<value> Valid values: 0, 1 Default value: 0

+FBU=0 Disables HDLC frame reporting. +FBU=1 Enables the modem to report the contents of Phase B and Phase D HDLC

frames to the host, as they are sent and received, in addition to other

responses. Reports use the +FHT: and +FHR: responses, described in the

Session Message Report Responses section of this chapter.

Class 2 +FBUG

Write syntax: +FBUG=<value> Values: 0, 1 Default: 0

The Class 2 parameter is identical to the Class 2.1 parameter except for the name.

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Negotiation Reporting

Class 2.1 +FNR

Write syntax: +FNR=<rpr>,<tpr>,<idr>,<nsr> Values: 0, 1 for each subparameter Default: 0,0,0,0

+FNR is a compound parameter, used to control the reporting of messages generated during T.30 Phase B negotiations. There are four switches, for four types of reports:

Setting Reference Description

rpr=0 rpr=1

tpr=0 tpr=1

idr=0 idr=1

nsr=0 nsr=1

Note If tpr=0, the negotiated image data format will not be reported. Without that report, the host must send

image data that is mandated by Recommendation T.30 (normal resolution, A4 length, 1728 width, 1-D coding) or it must enable the corresponding format conversion (+FFC). Otherwise, the data format negotiated and the data format sent might not match, causing the facsimile session to fail.

2.4.2.1 Receiver parameters are not reported; +FIS: and +FTC: reports are suppressed. Receiver parameters are reported; +FIS: and +FTC: reports are generated.

2.4.2.1 Transmitter parameters are not reported; +FCS: reports are suppressed. (Note) +FCS parameter is still loaded. Transmitter parameters are reported; +FCS: reports are generated.

2.4.2.3 ID strings are not reported; +FTI:, +FCI: and +FPI: reports are suppressed. ID strings are reported; +FTI:, +FCI: and +FPI: reports are generated.

2.4.2.4 Non-standard frames not reported; +FNF:, +FNS: and +FNC: reports suppressed. Non-standard frames reported; +FNF:, +FNS: and +FNC: reports generated.

Class 2 There is no equivalent parameter in Class 2.

Address & Polling Capabilities

Class 2.1 +FAP

Write syntax: +FAP=,<sep>,<pwd> Values: 0 (disabled) or 1 (enabled) for each subparameter Default: 0,0,0

The +FAP subparameters allow the host to indicate the inbound subaddressing, selective polling, and passwords capabilities to the remote station via the corresponding bits in the DIS or DTC frames: bit 47 for SEP, bit 49 for SUB, bit 50 for PWD.

These subparameters also control the reporting of those frames, if received. For example, if the <sep> subparameter value is set to 0 (disabled), then the modem ignores a received SEP frame; if the <sep> subparameter is set to 1 (enabled), the modem reports the received frame using the +FPA: report.

Class 2 There is no equivalent parameter in Class 2.

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Addressing & Polling Frames

Class 2.1 +FSA, +FPA, +FPW

Write syntax: +FSA="<destination Subaddress string>"

+FPA="<selective Polling Address string>" +FPW="<Password string>"

Values: 20 digit numeric ASCII string: digits 0-9, *, # and space only Default: Null String

The modem sends the numeric string contained in +FSA, +FPA or +FPW at the times specified in Recommendation T.30, if the corresponding parameter is not a Null String. The +FPW parameter is used for the PWD frame sent with either DTC or with DCS.

The +FSA=?, +FPA=?, and +FPW=? test commands report the correspondi ng ranges of character values supported.

The modem transmits digit string characters to the remote station in reversed time order from the order in the command line. If less than 20 characters are specified in a non-Null String, the modem appends space characters. If the specified string is more than 20 characters in length, an ERROR result code is generated.

Class 2 There are no equivalent parameters in Class 2.

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T.30 Procedure Control Parameters

The fax modem makes decisions at several nodes in the T.30 procedure. These parameters allow a host to sense or determine fax modem policy for these procedure decisi ons.

Page Transfer Status

Class 2.1 +FPS

Write syntax: + FPS=<ppr> Values: 1, 2, 3 Default: 1

The +FPS 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 modem sets this parameter after it receives a page of Phase C data. The transmitting modem sets this parameter with the status reported by the receiving station. The host may inspect or modify this parameter.

The set of <ppr> values is defined in Table 3.6. These values are also reported by the +FPS:<ppr> response to the +FDR command. The Multi-Tech implementation does not support <ppr> values 4 and 5.

Table 3.6 Class 2.1 T.30 Post Page Response Message Codes

Value Mnemonic Description

1 MCF Page good. 2 RTN Page bad; retrain requested.

3 RTP Page good; retrain requested. 4* PIN Page bad; retrain requested; interrupt request accepted. 5* PIP Page good; interrupt request accepted.

The modem may set this parameter to values 1, 2 or 3 based on its own copy quality checking or access to received signal quality. The modem sets this parameter to a value of 1 if copy quality checking is disabled (+FCQ=0).

A receiving host may do its own copy quality checking or decide to request a procedure interrupt from the remote station. The host will receive a report of the copy quality <ppr> as part of the +FPS:<ppr>,<lc>,<blc>,<cblc> response. The host may modify this result before it issues the next action command (e.g., +FDR), which releases the corresponding post page response to the remote facsimile station.

Class 2 +FPTS

Write syntax: + FPTS=<ppr> Valid values: 1, 2, 3, 4, 5 Default value: 1

Except for the name and the range of values, the Class 2 parameter is identical to the Class 2.1 parameter.

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Copy Quality Checking

Class 2.1 +FCQ

Write syntax: +FCQ=<rq>,<tq> Values: 0, 1 for <rq>

0 for <tq>

Default: 1 for <rq>

0 for <tq> Other values for <rq> and <tq> are not supported in the Multi-Tech implementation. The +FCQ parameter controls copy quality checking and correction by a facsimile modem. The <rq> subparameter controls copy quality checking and correction of data received from the remote station and delivered to the local host; the <tq> subparameter controls copy quality checking and correction of image data received from the local host and sent to the remote station.

The modem reports on Received Copy Quality to the host in the page status report, +FPS:<ppr>,<lc>,<blc>,<cblc>,<lbc>, and records it in the +FPS parameter.

+FCQ=0,0 modem receive copy quality checking is disabled; the modem will

generate copy quality OK (MCF) responses to complete pages, and set +FPS=1. modem transmit copy quality checking is disabled; the host is responsible for T.4 or T.6 compliance.

+FCQ=1,0 modem receive copy quality checking is enabled; the modem will

determine the recommended Post Page Message, and store it into the +FPS parameter. modem transmit copy quality checking is disabled; the host is responsible for T.4 or T.6 compliance.

Class 2 +FCQ

Write syntax: +FCQ=<value> Valid values: 0, 1 Default value: 0

This parameter controls copy quality checking by the receiving facsimile mode m. The modem will generate a page transfer report, indicated with the

+FPTS=<ppr>,<lc>,<blc>,<cblc> response and posted in the +FPTS parameter. The +FCQ parameter setting also conditions the generation of bad line count <blc> and consecutive bad line count <cblc> subparameters.

+FCQ=0 The modem does no copy quality checking. The modem will generate

copy quality OK (MCF) responses to complete pages, and set +FPS=1.

+FCQ=1 The modem can check 1-D Phase C data. The host must check copy

quality for 2-D Phase C data. On new -V92 modems, +FCQ=1 means it will also check 2-D Phase C data.

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Receive Quality Thresholds

Class 2.1 +FRQ

Write syntax: +FRQ=<pgl>,<cbl>

Values: 0 to 64h for <pgl>

0 to FFh for <cbl>

Default: 0,0

This compound parameter replaces the +BADMUL and +FBADLIN parameters used in Class 2. The modem may use it to make the "Copy Quality OK" decision in the T.30 flow chart (Figure A.7/T.30). If it is used, the modem shall judge copy quality unacceptable if either the percentage of good lines is too low or too many consecutive lines contain errors. Bad line counts are reported in the +FPS:<blc> response. A value of 0 disables either subparameter for use in copy quality checking.

The first subparameter, <pgl>, specifies the percentage of good lines (e.g. with negotiated number of pixels) required for a page to be considered acceptable. For example, if the modem counted bad lines (as reported in the +FPS <blc> subparameter) and total line count (as reported in the +FPS<lc> subparameter); the percentage of good lines would be computed by the following equation:

If the resulting value is less than the value in <pgl>, the page is unacceptable. The second subparameter, <cbl>, specifies the maximum tolerable number of

consecutive bad lines. If this value is exceeded for a given page, the modem shall consider the page unacceptable.

100 × (<lc> – <blc>) / <lc>

If the page is found unacceptable by either criteria, the modem shall report the value 2 for the +FPS <ppr> subparameter, and store that value into the +FPS parameter.

Class 2 +FBADMUL

Write syntax: +FBADMUL=<value> Values: 0–255 Default: 20

This is one of two Class 2 parameters used to determine “Copy Quality OK” on the T.30 flow chart. The number of lines received with a bad pixel count is multiplied by this number. If the result exceeds the number of lines in the page, then the error rate is too high. A value of 20 corresponds to a 5% error rate.

A value of 0 implies that error checking is not present or is disabled.

Class 2 +FBADLIN

Write syntax: +FBADLIN=<value> Valid values: 0–255 Default value: 10

This is the other Class 2 parameter used to determine “Copy Quality OK.” If the number of consecutive lines in normal resolution (98 dpi) mode that have pixel count errors is equal to or greater than <value>, then the copy quality is unacceptable. If the number of consecutive lines in fine resolution (196 dpi) mode that have pixel count errors is equal to or greater than <value> × 2, then the copy quality is unacceptable. “Copy Quality Not OK” occurs if either the error percentage i s too high or if too many consecutive lines contain errors. Bad line counts are reported in the +FPTS: response.

A value of 0 implies that error checking is not present or disabled.

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Adaptive Answer

Class 2.1 +FAA

Write syntax: +FAA=<value> Valid values: 0, 1 Default value: 0

+FAA=0 The modem shall answer only as a Class 2.1 facsimile device. No

automatic switching of service class shall occur based on the calling device type.

+FAA=1 The modem can answer and automatically determine whether to answer

as a facsimile modem or as a data modem. If the modem automatically switches, it resets the +FCLASS parameter to 0. +FCLASS does not affect switching to Class 2.1 from other classes or switching to classes other than Class 0.

Note: If the modem reconfigures itself to data modem operation in

adaptive answering, the host must reissue a new +FCLASS=2.1 command to enable subsequent Service Class 2.1 facsimile operation.

Class 2 +FAA

Write syntax: +FAA=<value> Valid values: 0, 1 Default value: 0

+FAA=0 Constrains the modem to answer as set by +FCLASS. +FAA=1 The modem can answer and automatically determine whether to answer

as a facsimile modem or as a data modem. If the modem automatically switches, it modifies FCLASS as appropriate.

Host Phase C Response Timeout, +FCT

Write syntax: +FCT=<value> Valid values: 0–255 in 100 -millisecond units. Default value: 30

This determines how long the modem waits for a command after reaching the end of data when transmitting in Phase C. When this time-out is reached a cancellation signal and then a +FHS:43 is issued to the host and the remote side is sent a disconnect frame.

+FPHCTO, Host Phase C Response Time-out

Class 2.1/2.0 Not Applicable.

Class 2

Syntax: +FPHCTO=<value> Value Values: 0 – 255 Default Value: 30

+FPHCTO=? 0-255 +FPHCTO? 30 Default value. Range: 0 - 255 This command specifies the waiting period during a fax transmission beyond which the transmission is automatically terminated with an end-of-page command.

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T.30 Session Error Report, +FAXERR

Class 2.0/2.1 not supported

Class 2 +FAXERR

Read syntax: > +FAXERR= <table value>, read only Valid values: 0–255; see Table 3.5 for meaning This read only parameter indicates the cause of a hang-up. Table 3.5 shows the valid values for this parameter as well as the meaning of each value. +FAXERR is set by the modem at the conclusion of a fax session. The modem will reset this to 0 at the beginning of Phase A off-hook time.

Minimum Phase C Speed, +FMS

Class 2.0/2.1 +FMS

Write syntax: +FMS=BR Valid values: 0–5, in BR subparameter codes Default value: 0 (V.27ter @ 2400 bit/s) This optional parameter limits the lowest negotiable speed for a session. It is useful for limiting the cost of a transmission by requiring a minimum transmission speed. If a facsimile cannot negotiate to a minimum speed, it performs an orderly disconnect.

The units are the same as those defined for the BR Bit Rate subparameter as defined in Table 3.6 in this manual.

Class 2 +FMINSP

Write syntax: +FMINSP=BR Valid values: 0–5, in BR subparameter codes Default value: 0 (V.27ter @ 2400 bit/s) This optional parameter limits the lowest negotiable speed for a session. It is useful for limiting the cost of a transmission by requiring a minimum transmission speed. If a facsimile cannot negotiate to a minimum speed, it performs an orderly disconnect.

The units are the same as those defined for the BR Bit Rate subparameter, as defined in Table 3.6 in this manual.

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Phase C Data Format Parameters

Data Bit Order: +FBO and +FBOR

Class 2.0/2.1 +FBO

Write syntax: +FBO=<value> Valid values: 0, 1 Default value: 0 This parameter controls the mapping between PSTN facsimile data and the hostmodem link. There are two choices: +FBO=0 Direct bit order for both Phase C data. The first bit transferred of each

byte on the host-modem link is the first bit transferred on the PSTN data carrier.

+FBO=1 Reversed bit order for Phase C data. The last bit transferred of each byte

is the first bit transferred on the PSTN data carrier. The effect of this parameter is illustrated for the EOL pattern in the Phase C Data Format Parameters section in this chapter.

Class 2 +FBOR

Write syntax: +FBOR =<value> Valid values: 0, 1 Default value: 0 This parameter controls the mapping between PSTN facsimile data and the hostmodem link. There are two choices: +FBOR=0 Direct bit order for both Phase C data. The first bit transferred of each

byte on the host-modem link is the first bit transferred on the PSTN data carrier. Applies to FAX sending for all Multi-Tech modems.

+FBOR=1 Reversed bit order for Phase C data. The last bit transferred of each

byte is the first bit transferred on the PSTN data carrier. Applies to

FAX sending for all Multi-Tech modems. The effect of this parameter is illustrated for the EOL pattern in the Phase C Data Format Parameters section in this chapter.

Phase C Received EOL Alignment: +FEA and +FREL

Class 2.0/2.1 +FEA

Write syntax: +FEA=<value> Valid values: 0, 1 Default value: 0 +FEA=0 EOL patterns are bit-aligned as received. +FEA=1 The last received bits of EOL patterns are byte-aligned by the

modem, with necessary zero fill bits inserted. There are two 2-byte

binary EOL patterns, in which xxxx represents previous data bits, zero

bits, or other leading data: +FBO=0: 0000xxxx 10000000 +FBO=1: xxxx0000 00000001

Class 2 +FREL

Write syntax: +FREL=<value> Valid values: 0, 1 Default value: 0 +FREL=0 EOL patterns are bit-aligned as received. +FREL=1 The last received bits of EOL patterns are byte-aligned by the

modem, with necessary zero fill bits inserted. There are two 2-byte

binary EOL patterns, in which xxxx represents previous data bits, zero

bits, or other leading data:

+FBOR=1: 0000xxxx 10000000 +FBOR=1: xxxx0000 00000001

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Format conversion, +FFC

Class 2.0/2.1

Write syntax: +FFC=<vrc>,<dfc>,<lnc>,<wdc> Valid values: see table below Default values: manufacturer’s option Mandatory values: 0,0,0,0 This compound parameter determines the modem response to mismatches between the Phase C data delivered after the +FDT command and the data format parameters negotiated for the facsimile session. For mismatch checking, the modem depends on the host to indicate the data format with embedded <DLE><format> character pairs. If these format indicators are not provided, the modem shall assume that the format is as negotiated for that session.

For each subparameter, value 0 determines that mismatch checking is disabled, and all format codes of this type are ignored. Value 1 determines that mismatch checking is enabled, with session termination if the format codes do not match the negotiated format reported in +FCS: responses. Other values enable degrees of format conversion. Unspecified values are reserved.

Setting Description

vrc=0 vrc=1 vrc=2 vrc=3 dfc=0 dfc=1 dfc=2 lnc=0 lnc=1 lnc=2 lnc=3 wdc=0 wdc=1 wdc=2

Vertical resolution format codes ignored Vertical resolution checking enabled Vertical resolution conversion enabled for 1-D data Vertical resolution conversion enabled for 2-D data Data format codes ignored Data format checking enabled Data format conversion enabled Page length format codes ignored Page length checking enabled Page length conversion enabled for 1-D data Page length conversion enabled for 2-D data Page width format codes ignored Page width checking enabled Page width conversion enabled

Class 2 Not Applicable

Note that the four arguments of the Class 2.0/2.1 command +FFC cover the same technical content as these four separate Class 2 commands (which are described in detail below):

+FVRFC (for vertical resolution), +FDFFC (for data compression format version), +FLNFC (for page length format conversion), and +FWDFC (for page width format conversion).

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Vertical Resolution Format Conversion +FVRFC

Class 2.0/2.1 Not Applicable Class 2

Write syntax: +FVRFC=<value> Valid values: 0, 1, 2 Default value: 0 This parameter determines the modem response to a mismatch between the ve rtical resolution negotiated for the facsimile session, reported by the +FCS:VR subparameter, and the Phase C data desired by the host, indicated by the optional +FDT:VR subparameter, or the +FIS=VR subparameter for +FDR operation.

FVRFC=0 Disables mismatch checking. The host must check the +FCS:VR

subparameter, and transfer matching data. FVRFC=1 Enables mismatch checking. An implied +FKS command is executed

on mismatch detection. FVRFC=2 Enables mismatch checking, with resolution conversion of 1-D data in

the modem. An implied +FKS command is executed on 2-D mismatch

detection.

Data Compression Format Conversion, +FDFFC

Class 2.0/2.1 Not Applicable Class 2 Write syntax: +FDFFC=<value>

Valid values: 0 Default value: 0 This parameter determines the modem response to a mismatch between the dat a format negotiated for the facsimile session, reported by the +FCS:DF subparameter, and the Phase C data desired by the host, indicated by the optional +FDT:DF subparameter, or the +FIS=DF subparameter for +FDR operation.

FDFFC=0 Disables mismatch checking. The host must check the +FCS:DF

subparameter, and transfer matching data.

Page Length Format Conversion, +FLNFC

Class 2.0/2.1 Not Applicable Class 2

Write syntax: +FLNFC=<value> Valid values: 0, 1, 2 Default value: 0 This parameter determines the modem response to a mismatch between the page length negotiated for the facsimile session, reported by the +FCS:LN subparameter, and the Phase C data desired by the host, indicated by the optional +FDT:LN subparameter, or the +FIS=LN subparameter for +FDR ope ration . A mismatch would require clipping or scaling a longer format to a shorter one.

FLNFC=0 Disables mismatch checking. The host must check the +FCS:LN

subparameter and transfer matching data. FLNFC=1 Enables mismatch checking. An implied +FKS command is executed

on mismatch detection. FLNFC=2 Enables mismatch checking, with page length conversion of 1-D data

in the modem. An implied +FKS command is executed on 2-D

mismatch detection.

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Page Width Format Conversion, +FWDFC

Class 2.0/2.1 Not Applicable Class 2

Write syntax: +FWDFC=<value> Valid values: 0, 1, 2 Default value: 0 This parameter determines the modem’s response to a mismatch betwee n the page width negotiated for the facsimile session, reported by the +FCS:WD subparameter, and the Phase C data desired by the host, indicated by the optional +FDT:WD subparameter, or the +FIS=WD subparameter for +FDR operation. A mismatch would require clipping or scaling a wider format to a narrower one.

FWDFC=0 Disables mismatch checking. The ho st must check the +FCS:WD

subparameter and transfer matching data. FWDFC=1 Enables mismatch checking. An implie d +FKS command is executed

on mismatch detection. FWDFC=2 Enables mismatch checking with page width conversion in the

modem.

Fax Flow Control, +FLO

Syntax: +FLO=<value> Valid values: 0, 1, 2 Default value: 1 The +FLO command allows the host to select and identify the types of flow control provided and used. A TR29-standard modem can support XON/XOFF flow control. XON is the ASCII <DC1> character (11h); XOFF is the ASCII <DC3> character (13h). The modem may provide ITU-T V.24 circuits 106 (CTS) and 133 (RTS) for flow control.

+FLO=0 No fax flow control. +FLO=1 Software fax flow control (XON/XOFF flow control in either direction). +FLO=2 Hardware fax flow control. ITU-T circuit 133 (RTS) is used for flow

control of the modem by the host. Circuit 106 (CTS) is used for flow

control of the host by the modem. If circuits 106 and 133 are not being use d for flow con t rol (+FLO=2),

then circuit 106 drops when an XOFF is sent, and goes high when an

XON is sent. The conductor used for circuit 133 normally reverts to

use as circuit 105 (RTS) when not being used for flow control.

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Chapter 3 – Fax Class 2 Commands

Set Current Time and Date, AT+FTD

The AT+FTD command is used to set the current date and time. The current time and date will be tracked automatically by the modem once the time and date are set. However, these boards do not have a real time clock. So, the accuracy of the time and date is not guaranteed. It is recommended that the current time and date be set before each FAX transmit session.

The syntax of the command is: AT+FTD=<year>, <month>, <hour>, <minute>, <second>, <zone>, <dtsdelta> The arguments to this command are: <year> The current year (UTC zone). Range: 1970 to 65535 <month> The current month number (UTC zone). Range: 1 to 12.

January is 1. <day> The current day of the month. Range: 1 to 31. <hour> The current hour in military time (UTC zone). Range: 0

to 23. <minute> The current minute (UTC zone). Range 0 to 59. <second> The current second (UTC zone). Range 0 to 59. <zone> The number of seconds east (positive) or west

(negative) that the local time zone is from Greenwich.

Range: -43200 to 43200. <dtsdelta> Zero if daylight savings time is not in effect at the current

time. Otherwise, the number of minutes to add to the

time. Range 0 to 255. The current local time is calculated from the UTX (Universal Coordinated Time, i.e., GMT) time specified in this command, plus the <zone> offset, plus the <dtsdelta> offset, plus the number of seconds accumulated by the board since the command was executed.

Page Header Generation, AT+FPH

The AT+FPH command is used to enable automatic generation of a FAX page header.

There are four legal formats for the syntax of this command:

The arguments to this command are: mode The mode argument controls generation of the page header. A mode

string The string defines the page heade r itself. Only ASCII printable

AT+FPH=mode, “left”(string is left justified) AT+FPH=mode, “left’middle’ right” AT+FPH=mode, “left ’right”

of 0 disables page header generation. A mode of 1 enables page header generation and the page header is prepended to the FAX page data. A mode of 2 enables page header generation and the page header is overlaid on the first few lines of the FAX page data.

characters are allowed in the string (0x20 through 0x7e). Escape sequences that are introduced with the percent (%) character are allowed. The string can be partitioned into one, two, or three parts by using single-quote characters ( ‘) in the command expression.

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Chapter 3 – Fax Class 2 Commands

An escape sequence is a “%” followed by an optional width, which may include a leading left-justification signifier, and then by the escape character itself. It is of the form %[numbers][-]character. The dash (“-“) denotes left justification. When the dash is absent, right justification is used. If the width specification starts with a zero, then, when the escape sequence is expanded, the value will be left-padded with zeroes. Otherwise, it will be left-padded with spaces.

The following escapes are recognized: %d (or %D ) The day of the month as a decimal number (range 01 to 31). %h (or %H ) The hour as a decimal number using a 24-hour clock (range 00 to 23). %i (or %I ) The hour as a decimal number using a 12-hour clock (range 01 to 12). %j (or %J) The day of the year as a decimal number (range 001 to 366). %m The month as a decimal number (range 01 to 12). %M The minute as a decimal number (two digits). %p Either ‘am’ or ‘pm’ according to the given time value, or the

corresponding strings.

%P The current page number of the FAX being sent, as computed by the

padding.

%r (or %R) The ID of the remote FAX machine. Leading and trailing blanks are

stripped. A print-style field width specifier such as %20r or %-20r can

be used to print this always in a fixed width field. %s (or %S) The second as a decimal number (two digits). %t (or %T) The ID of the transmitting FAX machine. Leading and trailing blanks

are stripped. A print-style field width specifier such as %20t or%-20t

can be used to print this always in a fixed width field. %y The year as a decimal number without a century. %Y The year as a decimal number including the century. %% A literal ‘%’ character.

If the string contains single quotes, it will be partitioned into left, and also possibly, middle and right parts.

left This portion of the header will be left justified. middle This portion of the header will be centered. right This portion of the header will be right justified.

Percent-introduced escapes are processed as above.

Miscellaneous Parameters

Buffer Size, +FBS (Class 2.1 only)

Read syntax: +FBS? modem response syntax: <bs>,<xoft>,<xont>,<bc>, where

<bs> = total buffer size, <xoft> = XOFF threshold, <xont> = XON threshold,

<bc> = current buffer byte count This parameter allows the host to determine the characteristics of the modem’s data buffer. Flow control is mandatory; buffers are needed for flow control. Use of the reported values would allow a host to transfer data without provoking XOFF.

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)

Chapter 3 – Fax Class 2 Commands

Session Message Report Responses

The modem may be commanded to report the T.30 Phase B and Phase D HDLC control frames as they are sent and received. This service supports session diagnostics and the debugging of host software. It is enabled by the +FBU parameter described in the Parameter Commands section of this chapter.

These messages are not generated in direct execution of host action commands; they are generated for each frame whenever the reported frame is sent or received. The host should not attempt to change serial port speed or parity with +FBU set. It is desirable to suppress e ch o of host commands, if the modem provides that facility.

The data will be reported with each T.30 command separated by <CR><LF>. The fill bits will be removed. The frame octets will be represented in hex notation, and separated by spaces. Flags and zero bits are removed. Frame octets are reported in the order sent or received. FCS byte s are deleted. Frame octets are presented with the LSB as the first bit sent or received.

The following is an example of a received DIS string report:

+FHR: FF 13 80 00 4E 78 FE AD<CR><LF>

Unless specified otherwise, the modem reports these frames before the co rresponding responses are generated. For example, the above examples would occur before the standard +FIS: report was made.

Report Transmit HDLC Frames, +FHT:

Syntax: +FHT:<transmitted HDLC frame octets> Reports the HDLC data that was sent by the modem.

Report Received HDLC Frames, +FHR:

Syntax: +FHR:<received HDLC frame octets> Reports the HDLC data that was received by the modem.

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Chapter 3 – Fax Class 2 Commands

Sample Modem Control Sessions

Send two pages, 1-D data, no errors (Class 2)

Host Commands

AT+FCLASS=2 OK Set Class 2 AT+FLID=”<local ID>” OK Set local ID ATD<dial string>

AT+FDT

<1st page data> send page data receive page data <DLE><ETX> OK AT+FET=0

AT+FDT CONNECT <2nd page data> send page data receive page data

AT+FET=2

Modem Responses

+FCON [+FCSI:”<csi.”] +FDIS:<dis codes. OK

+FDCS:<dcs codes> CONNECT <XON>

+FPTS:1 OK

<XON>

+FPTS:1 +FHNG:0 OK

Local Modem Action

off hook, dial, send CNG detect flags [get CSI] get DIS

[send TSI] send DCS send TCF

get CFR send carrier

send RTC send MPS get MCF

send carrier receive carrier

send RTC send EOP get MCF send DCN hang-up

Remote Station Action

answer, send ([CED], V.21 flags, [CSI], DIS

[get TSI] get DCS get TCF

send CFR receive carrier

get RTC get MPS send MCF

get RTC get EOP send MCF get DCN hang-up

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Chapter 3 – Fax Class 2 Commands

Receive two pages, 1-D data, no errors (Class 2)

Host

Modem Responses Local Modem Action Remote Station Action

Commands

AT+FCR=1 OK Enable Reception AT+FLID=”<local

OK Set local ID ID>” RING <- Detect ring <- Dials[, send CNG] ATA

+FCON

[+FCSI”<tsi>”]

+FDIS:<dis codes.

OK AT+FDR

+FCFR

+FDCS:<dcs codes>

CONNECT

<DC2>

<DLE><ETX><-

+FPTS:1,<lc>

+FET:0 <-

off hook, send CED, send CSI, send DIS, detect flags, [get TSI] get DIS begin TCF recv accept TCF send CFR

get page carrier get page data

detect RTC <get MPS

get CED, get CSI, get DIS, send V.21 flags, [send TSI], send DIS, start TCF finish FCT get CFR

send page carrier send page data

send RTC drop carrier, send MPS

OK AT+FDR

+FHNG:0 <-

send MCF get DCN <-

get MCF send DCN

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Chapter 3 – Fax Class 2 Commands

Send two pages, 1-D data, no errors (Class 2.0)

Square bracketed [ ] responses are conditional on the remote station actions; curly bracketed { } responses are conditional on switches set by the host. For this example, all reports are ena bled: +FNR=1,1,1,1. Square bracketed [ ] commas are optional for the host.

Host Commands

AT+FCLASS=2.0 OK Set Class 2

[AT+FPW="<sending password string>"]

[AT+FSA=""]

[AT+FLI="<local ID>"] OK Set local ID host may load a

ATD<dial string>

[AT+FNS="<hex NSS FIF string>"]

AT+FDT

<1st page data> <RTC pattern> <DLE><mps>

AT+FDT

<2nd page data> <RTC pattern> <DLE><eop>

Modem Responses

OK Set local PWD host may load a

OK Set SUB Host may load a

+FCO [+FNF:<nsf>] [+FCI:"<csi>"] {+FIS:<dis codes>} OK

OK host may respond to

{+FCS:<codes> } CONNECT

CONNECT

+FHS:00 OK

Local Modem Action

off hook, dial, send CNG detect flags [get NSF] [get CSI] get DIS

[send NSS,] [send PWD,] [send SUB,] [send TSI,] send DCS send TCF get CFR send carrier send page data send RTC send MPS get MCF

send carrier send 2nd page send RTC send EOP get MCF send DCN hang-up

Remote Station Action

answer, send [CED], preamble, [NSF,] [CSI,] DIS

[get NSS,] [get PWD,] [get SUB,] [get TSI,] get DCS get TCF send CFR get carrier get data get RTC get MPS send MCF

receive carrier get 2nd page get RTC get EOP send MCF get DCN hang-up

Notes

Password

destination SUBaddress

local ID

NSF frame

if +FNS loaded if +FPW loaded if +FSA loaded if +FLI loaded

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Chapter 3 – Fax Class 2 Commands

Receive two pages, 1-D data, no errors (Class 2.0)

In this example, the remote station sends NSS, SUB, PWD and TSI. The local modem has +FNR=1,1,1,1 and +FAP=1,1,1.

Host

Commands

AT+FCR=1 OK Enable Reception

[AT+FLI="<local ID>"]

[AT+FNS="<hex NSF FIF string>"]

RING <- Detect ring <- Dials[,send CNG]

ATA

AT+FDR

<DC2>

AT+FDR

Modem

Responses

OK Set local ID host may load the

OK host may set up

+FCO +FNS:<nss

string> +FPW:<pwd string> +FSA: +FTI:"<tsi ID>" {+FCS:<dcs codes>} OK

[+FCS:<dcs codes>] CONNECT <page data> <RTC pattern> <DLE><ETX>

+FPS:1,<lc>,0,0,0 +FET:0 <-

CONNECT <page data> <RTC pattern> <DLE><ETX> <-

+FPS:1,<lc>,0,0,0 +FET:2

+FHS:00 <OK

Local Modem

Action

off hook, send CED, [send NSF,] [send CSI,] send DIS, detect flags, get NSS, get PWD, get SUB, get TSI, get DCS begin TCF recv

accept TCF send CFR

get page carrier get page data detect RTC <-

get MPS <-

send MCF get carrier get page data detect RTC <-

get EOP <-

send MCF get DCN <hang-up

Remote Station

Action

get CED, [get NSF,] [get CSI,] get DIS, send Preamble, send NSS, send PWD, send SUB, send TSI, send DCS, start TCF

finish TCF get CFR

send carrier send page data send RTC,

send MPS

get MCF send carrier send page data send RTC,

send EOP

get MCF, send DCN hang-up

Notes

local ID

NSF string

if +FNS loaded if +FLI loaded

Another +FCS would be reported if the parameters changed after retraining

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Chapter 3 – Fax Class 2 Commands

Originate and send a two page facsimile with V.34 half-duplex (Class 2.1)

Optional T.30 frames are omitted. +FNR=1,1,, +FIS and +FCS subparameters other than BR and EC are not shown.

Host

Commands

AT+FCLASS=2.1 OK Set class 2

AT+FIS=,B,,,,3,,, OK

Modem

Responses

Local Modem

Action

Set for Rec. V.34,

Remote Station

Action

Annex A/T.30, Annex C/T.30 or Annex F/T.30

ATD<dial string>

+FCO

+FIS:,B,,,,1,,,

off-hook, dial,

send CNG detect ANSam send CM get JM send CJ negotiate Rec. V.34 begin control chan get DIS

detect ringing answer detect CNG send ANSam get CM send JM get CJ negotiate Rec. V.34 begin control chan send DIS

AT+FDT

<1st page data> <DLE><mps>

+FCS:,9,,,,1,,, CONNECT

send DCS get CFR switch to primary chan send page FCD switch to control chan send MPS get MCF

get DCS send CFR switch to primary chan get page data switch to control chan get MPS send MCF

Notes

(“Chan” = channel)

Rec. T.30 selected with JM signal from remote terminal

the remote indicated

800 bit/s ability

in this example,

400 bit/s is

24 selected

AT+FDT

<2nd page data>

CONNECT

+FHS:00 OK

switch to primary chan send page 2 FCD switch to control chan send EOP get MCF send DCN hang-up

switch to primary chan get page 2 FCD switch to control chan get EOP send MCF get DCN hang-up

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Chapter 3 – Fax Class 2 Commands

Answer and receive a two-page facsimile with V.34 half-duplex (Class 2.1)

Host

Commands

Modem

Responses

Local Modem

Action

Remote Station

Action

AT+FCLASS=2.1 OK Set class 2

AT+FIS=,D,,,,3, ,,,

Set for Rec. V.34, Annex A/T.30, Annex C/T.30 or Annex F/T.30

RING detect ringing off-hook, dial

ATA

+FCO

answer detect CNG send ANSam get CM send JM get CJ negotiate Rec. V.34 begin control channel send DIS

send CNG detect ANSam send CM get JM send CJ negotiate Rec. V.34 begin control channel get DIS

AT+FDT

+FCS:,B,,,,1,,,,

CONNECT

<1st page data> <DLE><ETX> +FPS:1,<lc>,0,0 ,0

get DCS send CFR switch to primary channel get page 1 FCD switch to control channel get MPS

send DCS get CFR switch to primary channel send page 1 FCD switch to control channel

send MPS +FET:0 OK

Notes

select max rate

600 bit/s

of 33

Rec. T.30 selected with JM signal from remote terminal

the remote indicated 28

800 bit/s ability

in this example, 28

800 bit/s is

selected

AT+FDR

CONNECT

<2nd page data> <DLE><ETX> +FPS:1,<lc>,0,0 ,0 +FET:2

+FHS:00 OK

send MCF switch to primary channel get page 2 FCD switch to control channel get EOP

send MCF get DCN hang-up

get MCF

switch to primary

channel

send page 2 FCD

switch to control

channel

send EOP

get MCF

send DCN

hang-up

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Chapter 3 – Fax Class 2 Commands

Alphabetic List of Commands and Responses

Name Description

A Answer command D<string> Originate command +FAA= Auto Answer Mode parameter +FAXERR= Fax Error Value parameter +FBADLIN= Number of Consecutive Bad Lines for a Bad Page parameter +FBADMUL= Error Thre shol d Mult ipl ier +FBO= Phase C Data Bit Order parameter +FBS? Buffer Size, read-only parameter +FBU= Session Message Reporting parameter +FPI: Report Remote ID response, CIG +FCFR Confirmation to Receive prompt +FCLASS= Service Class ID +FCO Facsimile Connection response +FCQ= Copy Quality Capabilities parameter +FCR= Capability to Receive parameter +FCI: Report remote ID response, CSI +FPI= Local Polling ID String parameter +FCS: Report Session Parameters response +FCS= Current Session results +FDFFC= Data Compression Format Conversion parameter +FCC= modem Capabilities parameters +FIS: Report Remote Capabilities response +FIS= Current Session Negotiation parameters +FDR Receive Phase C Data command +FDT[=] Transmit Phase C Data command +FRY= CTC Retry Value +FTC: Report Remote capabilities response +FET: Post Page Message response +FET= End the Page or Document command +FHS: Call Termination Status response +FHR: Report Received HDLC Frame response +FHT: Report Transmitted HDLC Frame respo nse +FKS Orderly Fax Abort command +FLI= Local ID String parameter, TSI/CSI +FLNFC= Page Length Format Conversion parameter +FLO Fax Flow Control +FLP= Document for Polling parameter +FMM? Request modem Model

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Multi-Tech Systems V.92, V.34 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual