Hayes H08-15531-EF, H08-15400-72C Reference Manual

Commands for Host-

Commands for Host-

Commands for Host-Commands for Host­Processed and Host-

Processed and Host-

Processed and Host-Processed and Host­Controlled Modems

Controlled Modems

Controlled ModemsControlled Modems

Reference Manual

Reference Manual

Reference ManualReference Manual

Conexant Proprietary Information

Doc. No. 100498D
April 5, 2001

Commands Reference Manual

Revision Record

Revision Date Comments

100498D 4/5/2001 Rev. D release. Supersedes 100498C.
100498C

(Marked 1118, Rev. 2)

100498B
(Marked 1118, Rev. 1)

100498A
(Marked 1118)

2/5/1999

9/9/1998 Rev. B release. Supersedes 100498A.

5/30/1997 Rev. A release.

Rev. C release. Supersedes 100498B and
Doc. No. 1163, Rev. 2.

© 1997, 1998, 1999, 2001

All Rights Reserved.

Information in this document is provided in connection with Conexant Systems, Inc. (“Conexant”) products. These materials are
provided by Conexant as a service to its customers and may be used for informational purposes only. Conexant assumes no
responsibility for errors or omissions in these materials. Conexant may make changes to specifications and product descriptions at
any time, without notice. Conexant makes no commitment to update the information and shall have no responsibility whatsoever for
conflicts or incompatibilities arising from future changes to its specifications and product descriptions.

No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as
provided in Conexant’s Terms and Conditions of Sale for such products, Conexant assumes no liability whatsoever.

THESE MATERIALS ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED,
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resulting from such improper use or sale.

The following are trademarks of Conexant Systems, Inc.: Conexant™, the Conexant C symbol, “What’s Next in Communications
Technologies”™, SmartDAA™, K56flex™, SmartHCF™, and SmartHSF™. Product names or services listed in this publication are
for identification purposes only, and may be trademarks of third parties. Third-party brands and names are the property of their
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For additional disclaimer information, please consult Conexant’s Legal Information posted at www.conexant.com, which is
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Reader Response:

suggestions to [e-mail]. For technical questions, contact your local Conexant sales office or field applications
engineer.

Conexant strives to produce quality documentation and welcomes your feedback. Please send comments and

Conexant Systems, Inc.

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Contents

1 Introduction......................................................................................................................................... 1-1

1.1 Overview .....................................................................................................................................................................1-1

1.1.1 Command Syntax........................................................................................................................................1-1

1.1.2 Command Descriptions ...............................................................................................................................1-1

1.2 Reference Documentation ...........................................................................................................................................1-2

2 Syntax and Procedures........................................................................................................................ 2-1

2.1 Alphabet......................................................................................................................................................................2-1

2.2 DTE Commands Lines.................................................................................................................................................2-1

2.2.1 Command Line General Format ...................................................................................................................2-1

2.2.2 Command Line Editing ................................................................................................................................2-2

2.2.3 Command Line Echo ...................................................................................................................................2-2

2.2.4 Repeating a Command Line.........................................................................................................................2-2

2.2.5 Types of DTE Commands............................................................................................................................2-2

2.3 Basic Syntax Commands.............................................................................................................................................2-3

2.3.1 Basic Syntax Command Format...................................................................................................................2-3

2.3.2 S-Parameters ..............................................................................................................................................2-3

2.4 Extended Syntax Commands.......................................................................................................................................2-4

2.4.1 Command Naming Rules.............................................................................................................................2-4

2.4.2 Values .........................................................................................................................................................2-4

Numeric Constants..............................................................................................................................2-4

String Constants..................................................................................................................................2-5

Compound Values................................................................................................................................2-5

2.4.3 Action Commands.......................................................................................................................................2-5

Action Execution Command Syntax .....................................................................................................2-5

Action Test Command Syntax..............................................................................................................2-6

2.4.4 Parameter Commands.................................................................................................................................2-6

Parameter Types..................................................................................................................................2-6

Parameter Set Command Syntax .........................................................................................................2-6

Parameter Read Command Syntax.......................................................................................................2-7

Parameter Test Command Syntax........................................................................................................2-7

2.4.5 Additional Syntax Rules...............................................................................................................................2-7

Concatenating Commands after Extended Syntax Commands..............................................................2-7

Concatenating Commands after Basic Format Commands...................................................................2-7

2.5 Issuing Commands .....................................................................................................................................................2-8

2.6 Executing Commands..................................................................................................................................................2-8

2.6.1 Aborting Commands....................................................................................................................................2-8

2.6.2 Handling of Invalid Numbers and S-Parameter Values.................................................................................2-9

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2.7 Modem Responses......................................................................................................................................................2-9

2.7.1 Responses...................................................................................................................................................2-9

2.7.2 Extended Syntax Result Codes ..................................................................................................................2-10

2.7.3 +<name>: <compound_value>Information Text Formats for Test Commands ...........................................2-11

Range of Values.................................................................................................................................2-11

Compound Range of Values...............................................................................................................2-11

3 Data Command Set.............................................................................................................................. 3-1

3.1 Command Guidelines..................................................................................................................................................3-1

3.1.1 Escape Code Sequence................................................................................................................................3-1

3.2 Data Commands..........................................................................................................................................................3-1

3.2.1 Generic Modem Control...............................................................................................................................3-2

Z - Reset to Default Configuration........................................................................................................3-2

+FCLASS - Select Active Service Class.................................................................................................3-2

+VCID - Caller ID (CID)........................................................................................................................3-3

+VRID - Report Retrieved Caller ID (CID).............................................................................................3-4

\N - Operating Mode ............................................................................................................................3-5

&F - Set to Factory-Defined Configuration............................................................................................3-6

&T - Local Analog Loopback Test ........................................................................................................3-6

I - Request Identification Information ..................................................................................................3-7

+GMI - Request Manufacturer Identification ........................................................................................3-8

+GMM - Request Model Identification..................................................................................................3-9

+GMR - Request Revision Identification...............................................................................................3-9

+GSN - Request Product Serial Number Identification .........................................................................3-9

+GOI - Request Global Object Identification.......................................................................................3-10

+GCAP - Request Complete Capabilities List......................................................................................3-10

+GCI - Country of Installation.............................................................................................................3-11

3.2.2 DTE-Modem interface commands .............................................................................................................3-12

E - Command Echo............................................................................................................................3-12

Q - Quiet Results Codes Control ........................................................................................................3-12

V - Result Code Form.........................................................................................................................3-13

W - Connect Message Control ...........................................................................................................3-13

X - Extended Result Codes.................................................................................................................3-14

&C - RLSD Behavior ..........................................................................................................................3-18

&D - DTR Behavior ............................................................................................................................3-19

&K - Flow Control..............................................................................................................................3-20

&M - Asynchronous/Synchronous Mode Selection............................................................................3-20

&Q - Sync/Async Mode......................................................................................................................3-21

+IPR - Fixed DTE Rate .......................................................................................................................3-22

+IFC - DTE-Modem Local Flow Control ..............................................................................................3-23

+ILRR - DTE-Modem Local Rate Reporting........................................................................................3-24

3.2.3 Call Control................................................................................................................................................3-25

D - Dial ..............................................................................................................................................3-25

T - Set Tone Dial Default....................................................................................................................3-27

P - Set Pulse Dial Default...................................................................................................................3-27

A - Answer.........................................................................................................................................3-27

H - Disconnect (Hang-Up) .................................................................................................................3-28

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O - Return to On-Line Data Mode.......................................................................................................3-28

L - Speaker Volume ...........................................................................................................................3-29

M - Speaker Control...........................................................................................................................3-29

&G - Select Guard Tone.....................................................................................................................3-30

&P - Select Pulse Dial Make/Break Ratio............................................................................................3-30

&V - Display Current Configuration and Stored Profile.......................................................................3-31

&W - Store Current Configuration......................................................................................................3-31

*B - Display Blacklisted Numbers ......................................................................................................3-32

*D - Display Delayed Numbers ..........................................................................................................3-32

3.2.4 Modulation Control Commands.................................................................................................................3-33

+MS - Modulation Selection...............................................................................................................3-33

+MR - Modulation Reporting Control.................................................................................................3-36

%E - Enable/Disable Line Quality Monitor, Auto-Retrain, and Auto-Rate Renegotiation......................3-37

3.2.5 Error Control Commands...........................................................................................................................3-38

+ES - Error Control and Synchronous Mode Selection.......................................................................3-38

+EB - Break Handling in Error Control Operation................................................................................3-40

+ESR - Selective Repeat.....................................................................................................................3-40

+EFCS - 32-bit Frame Check Sequence ..............................................................................................3-41

+ER - Error Control Reporting............................................................................................................3-42

+ETBM - Call Termination Buffer Management...................................................................................3-44

3.2.6 Data Compression Commands ..................................................................................................................3-45

+DS - Data Compression ...................................................................................................................3-45

+DS44 - V.44 Compression Select .....................................................................................................3-46

+DR - Data Compression Reporting...................................................................................................3-47

%C - Enable/Disable Data Compression.............................................................................................3-48

N - Automode Enable.........................................................................................................................3-49

3.2.7 V.8/V.8bis Commands...............................................................................................................................3-49

+A8E - V.8 and V.8bis Operation Controls..........................................................................................3-49

+A8M - Send V.8 Menu Signals .........................................................................................................3-50

+A8I: - CI Signal Indication ................................................................................................................3-51

+A8C: - Calling Tone Indication..........................................................................................................3-51

+A8A: - Answer Signal Indication.......................................................................................................3-52

+A8J: - V.8 Negotiation Complete ......................................................................................................3-52

+A8M: - V.8 Menu Report..................................................................................................................3-53

+A8R: - V.8bis Signal and Message Reporting...................................................................................3-53

3.2.8 Synchronous Access Mode Commands.....................................................................................................3-56

+ESA - Configure Synchronous Access Mode....................................................................................3-56

+ITF - Transmit Flow Control Thresholds...........................................................................................3-58

3.2.9 Diagnostic and Test Commands ................................................................................................................3-59

#UD – Last Call Status Report............................................................................................................3-59

%TT - PTT Test Command.................................................................................................................3-66

3.2.10 V.92 +P and –Q Commands.......................................................................................................................3-69

+PCW - Call Waiting Enable ...............................................................................................................3-69

+PMH - Modem-on-Hold Enable........................................................................................................3-70

+PMHT – Modem-on-Hold Timer.......................................................................................................3-71

+PMHR - Initiate Modem-on-Hold .....................................................................................................3-72

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+PIG - PCM Upstream Ignore ............................................................................................................3-73

+PMHF - V.92 Modem-on-Hold Hook Flash .......................................................................................3-73

+PQC - V.92 Phase 1 and Phase 2 Control.........................................................................................3-74

+PSS - Use Short Sequence...............................................................................................................3-75

-QCPC - Force Full Startup Procedure Next Connection .....................................................................3-76

-QCPS - Enable Quick Connect Profile Save.......................................................................................3-76

3.3 S-Parameters ............................................................................................................................................................3-77

AT=x - Write to Selected S-Parameter................................................................................................3-77

AT? - Read Selected S-Parameter......................................................................................................3-77

Sn - Read/Write S-Parameter.............................................................................................................3-78

3.3.1 Factory Defaults.........................................................................................................................................3-78

3.3.2 S-Parameter Definitions ............................................................................................................................3-78

S0 - Number of Rings to Automatic Answer ......................................................................................3-78

S1 - Ring Counter..............................................................................................................................3-78

S2 - Escape Character........................................................................................................................3-79

S3 - Line Termination Character ........................................................................................................3-79

S4 - Response Formatting Character .................................................................................................3-79

S5 - Command Line Editing Character ...............................................................................................3-79

S6 - Wait Time for Dial Tone Before Blind Dialing, or After “W” Dial Modifier ....................................3-80

S7 - Wait Time For Carrier After Dial, For Silence, or For Dial Tone After “W” Dial Modifier ...............3-80

S8 - Pause Time For Dial Delay..........................................................................................................3-80

S10 - Lost Carrier To Hang Up Delay .................................................................................................3-81

S11 - DTMF Tone Duration ................................................................................................................3-81

S12 - Escape Prompt Delay (EPD) .....................................................................................................3-81

S18 - Test Timer................................................................................................................................3-81

S29 - Flash Dial Modifier Time...........................................................................................................3-81

S30 - Disconnect Inactivity Timer ......................................................................................................3-82

S46 - Data Compression Control .......................................................................................................3-82

S95 - Extended Result Codes Control ................................................................................................3-82

3.4 Cellular Commands...................................................................................................................................................3-83

3.4.1 PDC Mode Enable/Disable.........................................................................................................................3-83

+WS - Enable/Disable PDC.................................................................................................................3-83

3.4.2 PDC High-Speed Data Communication Mode Commands..........................................................................3-84

3.5 Result Codes.............................................................................................................................................................3-85

4 Fax Class 1 and Fax Class 1.0 Commands ........................................................................................... 4-1

4.1 Fax I/O Processing ......................................................................................................................................................4-1

4.1.1 DTE-to-Modem Transmit Data Stream.........................................................................................................4-1

4.1.2 Modem-to-DTE Receive Data Stream...........................................................................................................4-1

4.1.3 Fax Mode Selection .....................................................................................................................................4-1

4.1.4 Fax Origination ............................................................................................................................................4-3

4.1.5 Fax Answering .............................................................................................................................................4-3

4.1.6 Fax Control Transmission............................................................................................................................4-3

4.1.7 Fax Control Reception .................................................................................................................................4-3

4.1.8 Fax Data Transmission ................................................................................................................................4-4

4.1.9 Fax Data Reception......................................................................................................................................4-5

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4.2 Commands and Parameters ........................................................................................................................................4-6

4.2.1 Mode Entry Commands...............................................................................................................................4-6

+FCLASS=1 - Select Facsimile Class 1 Mode .......................................................................................4-6

+FCLASS=1.0 - Select Facsimile Class 1.0 Mode .................................................................................4-6

4.2.2 Mode Commands........................................................................................................................................4-6

+FAE - Auto Answer Enable..................................................................................................................4-6

+FTS - Transmit Silence.......................................................................................................................4-7

+FRS - Receive Silence........................................................................................................................4-8

+FTM - Transmit Facsimile...................................................................................................................4-9

+FRM - Receive Facsimile..................................................................................................................4-10

+FTH - Transmit Data with HDLC Framing .........................................................................................4-11

+FRH - Receive Data with HDLC Framing...........................................................................................4-12

4.2.3 Service Class 1 Parameters .......................................................................................................................4-13

+FAR - Adaptive Reception Control....................................................................................................4-13

+FCL - Carrier Loss Timeout ..............................................................................................................4-14

+

FDD - Double Escape Character Replacement ..................................................................................4-15

+

FIT - DTE Inactivity Timeout.............................................................................................................4-16

+FPR - Fixed DTE Rate.......................................................................................................................4-17

+FMI - Request Manufacturer Identification.......................................................................................4-18

+FMM - Request Model Identification ................................................................................................4-18

+FMR - Request Revision Identification.............................................................................................4-18

+FLO - Flow Control...........................................................................................................................4-19

4.3 Examples...................................................................................................................................................................4-19

5 Voice Commands................................................................................................................................. 5-1

5.1 Voice Commands Overview.........................................................................................................................................5-1

5.1.1 <DLE> Shielded Event Codes Sent to the DTE..............................................................................................5-2

5.1.2 <DLE> Shielded Codes Sent to the Modem (DCE) .......................................................................................5-3

5.2 Voice Commands........................................................................................................................................................5-4

5.2.1 Configuration Commands............................................................................................................................5-4

+FCLASS=8 - Select Voice Mode .........................................................................................................5-4

+VNH - Automatic Hang-up Control.....................................................................................................5-4

5.2.2 Voice Commands ........................................................................................................................................5-5

+VIP - Voice Initialize All Parameters ...................................................................................................5-5

+VRX - Start Modem Receive (Record)................................................................................................5-5

+VTR - Start Voice Transmission and Reception (Voice Duplex)..........................................................5-6

+VTS - Send Voice Tone(s)..................................................................................................................5-7

+VTX - Start Modem Transmit (Playback)............................................................................................5-9

+VGR - Voice Gain Receive (Record Gain) ...........................................................................................5-9

+VGT - Voice Gain Transmit (Playback Volume) ................................................................................5-10

+VIT - Voice Inactivity Timer (DTE/Modem).......................................................................................5-11

+VLS - Analog Source/Destination Selection......................................................................................5-12

+VRA - Ringback Goes Away Timer ...................................................................................................5-13

+VRN - Ringback Never Appeared Timer............................................................................................5-14

+VSD - Silence Detection (Quiet and Silence) ....................................................................................5-15

+VSM - Compression Method Selection ............................................................................................5-16

+VTD - Beep Tone Duration Timer .....................................................................................................5-17

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+VDR - Distinctive Ring.....................................................................................................................5-18

+VDT - Control Tone Cadence Reporting............................................................................................5-19

+VBT - Buffer Threshold Setting ........................................................................................................5-20

+VPR - Select DTE/Modem Interface Rate (Turn Off Autobaud) .........................................................5-21

5.2.3 Speakerphone Commands.........................................................................................................................5-22

+VSP - Speakerphone ON/OFF...........................................................................................................5-22

+VDX - Speakerphone Duplex Mode ..................................................................................................5-23

+VGM - Microphone Gain ..................................................................................................................5-24

+VGS - Speaker Gain .........................................................................................................................5-25

6 Index.................................................................................................................................................... 6-1

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Tables

Table 3-1. Result Codes.................................................................................................................................................3-15

Table 3-2. +MS Command Supported Rates..................................................................................................................3-33

Table 3-3. V.8/V.8bis Example Commands/Responses for Originator and Answerer......................................................3-54

Table 3-4. AT#UD Last Call Status Report Format .........................................................................................................3-61

Table 3-5. Call Setup Result Codes................................................................................................................................3-62

Table 3-6. Multimedia Modes ........................................................................................................................................3-62

Table 3-7. DTE-DCE modes ...........................................................................................................................................3-62

Table 3-8. V.34 INFO bit report......................................................................................................................................3-62

Table 3-9. gstnModulationSchemeActive from 3.7.2/V.58.............................................................................................3-63

Table 3-10. errorControl Active from 3.5.2/V.58............................................................................................................3-63

Table 3-11. compressionActive from 3.2.2/V.58............................................................................................................3-63

Table 3-12. callCleared codes from 3.6.4/V.58-1994 .....................................................................................................3-64

Table 3-13. Completed Data Call, with Some Errors and Rate Retrain during the Call....................................................3-65

Table 3-14. S-Parameter Summary ...............................................................................................................................3-77

Table 3-15. Result Code Definitions...............................................................................................................................3-86

Table 4-1. Fax Class 1 and Fax Class 1.0 Commands.......................................................................................................4-2

Table 4-2. Fax Class 1 and Fax Class 1.0 Modulation Modes and Rates...........................................................................4-9

Table 4-3. Inactivity Timer Start and Stop Events ..........................................................................................................4-16

Table 4-4. Fax Class 1 Calling Sequence (Transmitting a Single Page) ..........................................................................4-20

Table 4-5. Fax Class 1 Answering Sequence (Receiving a Single Page) .........................................................................4-21

Table 5-1. Voice Commands............................................................................................................................................5-1

Table 5-2. Supported <DLE> Shielded Codes Sent to the DTE.........................................................................................5-2

Table 5-3. Supported <DLE> Shielded Codes Sent to the Modem (DCE)..........................................................................5-3

Table 5-4. +VLS Command Options...............................................................................................................................5-12

Commands Reference Manual

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1

1.1

Commands Reference Manual

Introduction

Overview

This manual describes the host command and responses for Conexant host-controlled
(HCF) and host-processed (HSF or SoftK56) modem families.

The descriptions in this manual apply to all commands and parameters that may be supported
by different modem models. Refer to Modem Software Release notes for commands
applicable to specific modem models.

The commands and responses are implemented in host software for specific modem models.
Additional configuration and implementation information is available in release notes and/or
readme files that accompany product software release. The .INF File contains exact
application unique information and default values.

1.1.1

1.1.2

Command Syntax

The fundamental DTE interface command syntax is described in Section 2.

Command Descriptions

These commands are grouped into the following categories:

Syntax and procedures Section 2
Data commands Section 3
Fax Class 1 and Fax Class 1.0 commands Section 4
Voice/Audio commands Section 5

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1.2

Commands Reference Manual

Reference Documentation

Document Title Document No.

RC56HCF-PCI Modem Device Set Designer’s Guide 100759 (formerly 1129)
RC56D-PCI Host Controlled V.90/K56flex Modem Device Family for Desktop

Applications Designer’s Guide
SoftK56-PCI Modem Device Set Designer's Guide (Order No. 1160) 100811 (formerly 1160)
SoftK56-PCI Host-Software Processed V.90/K56flex Modem Device Family for

Desktop Applications Designer's Guide (Order No. 1201)

RH56LD-PCI Host-Controlled V.90/K56flex Modem Device Family for Mobile
Applications

RS56L-PCI Host-Processed V.90/K56flex Modem Device Family for Mobile
Applications

RMH56LD/RMS56LD Host-Controlled/Processed V.90/K56flex Modem Device
Family for Mobile Applications (Order No. 1203)

CX11252 HSF Modem, Host-Processed V.92/V.90/K56flex Modem Device
Family for PCI-Bus Desktop and Mobile Applications Data Sheet

LAN/Soft V.92 SmartDAA Modem Device Set for PCI Data Sheet 101480

100762 (formerly 1174)

100813 (formerly 1201)

100819 (formerly 1164)

100820 (formerly 1202)

100821 (formerly 1203)

101309

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2.1

Commands Reference Manual

Syntax and Procedures

The command and response syntax and procedures generally conform to referenced
recommendations and standards. Since these recommendations and standards describe
characteristics universal to a large installed base of modems to a maximum degree, there may
be syntax and procedural differences due to extensions and behavioral differences in
implemented commands, parameters, and responses beyond that described in these
recommendations and standards.

The syntax and procedures described in this section are based on V.250 and V.253 with
additional information included for implemented extensions, behavioral differences beyond
V.250, and legacy commands.

Alphabet

The T.50 International Alphabet 5 (IA5) is used in this document. Only the low-order seven
bits of each character are significant to the modem; any eighth or higher-order bit(s), if
present, are ignored for the purpose of identifying commands and parameters. Lower-case
characters are considered identical to their upper-case equivalents when received by the
modem from the DTE. Result codes from the modem are in upper case.

2.2

2.2.1

DTE Commands Lines

Words enclosed in <angle brackets> are references to syntactical elements. The brackets are
not used when the words appear in a command line, the brackets are not used. Words
enclosed in [square brackets] represent optional items which may be omitted from the
command line at the specified point. The square brackets are not used when the words appear
in the command line. Other characters that appear in syntax descriptions must as included as
shown.

Any modem responses are mentioned in terms of their alphabetic format; the actual response
issued will depend on the setting of parameters that affect response formats, e.g., Q and V
commands (see 2.7).

Command Line General Format

A command line is made up of three elements: the prefix, the body, and the termination
character.

The command line prefix consists of the characters "AT" or "at" or, to repeat the execution of
the previous command line, the characters "A/" or "a/".

The body is made up of individual commands described in this document. Space characters
(IA5 2/0) are ignored and may be used freely for formatting purposes, unless they are
embedded in numeric or string constants. The termination character may not appear in the
body. The modem can accept at least 40 characters in the body.

The termination character may be selected by a user option (parameter S3), the default being
CR.

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2.2.2

2.2.3

2.2.4

Commands Reference Manual

Command Line Editing

The character defined by parameter S5 (default, BS) is interpreted as a request from the DTE
to the modem to delete the previous character. Any control characters (IA5 0/0 through 1/15,
inclusive) that remain in the command line after receipt of the termination character are
ignored by the modem.

The modem checks characters from the DTE first to see if they match the termination
character (S3), then the editing character (S5), before checking for other characters. This
ensures that these characters will be properly recognized even if they are set to values that the
modem uses for other purposes. If S3 and S5 are set to the same value, a matching character
will be treated as matching S3 (S3 is checked before S5).

Command Line Echo

The modem may echo characters received from the DTE during command state and online
command state back to the DTE, depending on the setting of the E command. If enabled,
characters received from the DTE are echoed in the same format as received. Invalid
characters in the command line or incomplete or improperly-formed command line prefixes
may not be echoed.

Repeating a Command Line

2.2.5

If the prefix "A/" or "a/" is received, the modem immediately executes once again the body of
the preceding command line. No editing is possible, and no termination character is
necessary. A command line may be repeated multiple times in this manner. Responses to the
repeated command line are issued using format of the original command line. If "A/" is
received before any command line has been executed, the preceding command line is
assumed to have been empty (that results in an OK result code).

Types of DTE Commands

There are two types of commands: action commands and parameter commands. Commands of
either type may be included in command lines, in any order.

Action commands may be "executed" (to invoke a particular function of the equipment, which
generally involves more than the simple storage of a value for later use), or "tested" (to
determine whether or not the equipment implements the action command, and, if
subparameters are associated with the action, the ranges of subparameter values that are
supported).

Parameters may be "set" (to store a value or values for later use), "read" (to determine the
current value or values stored), or "tested" (to determine whether or not the equipment
implements the parameter, and the ranges of values supported).

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2.3

2.3.1

Commands Reference Manual

Basic Syntax Commands

Basic Syntax Command Format

The format of Basic Syntax commands, except for the D and S commands, is as follows:

<command>[<number>]

where <command> is either a single character, or the "&" character followed by a single
character per V.250. In addition, <command> can be the "%" character followed by a single
character, the "*" character followed by a single character, or the "^" character followed by a
single character.

<number> may be a string of one or more characters from "0" through "9" representing a
decimal integer value. Commands that expect a <number> are noted in the description of the
command. If a command expects <number> and it is missing (<command> is immediately
followed in the command line by another <command> or the termination character), the value
"0" is assumed. If a command does not expect a <number> and a number is present, an
ERROR is generated. All leading "0"s in <number> are ignored by the modem.

Additional commands may follow a command (and associated parameter, if any) on the same
command line without any character required for separation. The actions of some commands
cause the remainder of the command line to be ignored (e.g., A).

2.3.2

See the D command for details on the format of the information that follows it.

S-Parameters

Commands that begin with the letter "S" are known as "S-parameters". The number following
the "S" indicates the "parameter number" being referenced. If the number is not recognized as
a valid parameter number, an ERROR result code is issued.

Immediately following this number, either a "?" or "=" character must appear. "?" is used to
read the current value of the indicated S-parameter; "=" is used to set the S-parameter to a
new value.

S<parameter_number>?

S<parameter_number>=[<value>]

If the "=" is used, the new value to be stored in the S-parameter is specified in decimal
following the "=". If no value is given (i.e., the end of the command line occurs or the next
command follows immediately), the S-parameter specified may be set to 0, or an ERROR
result code issued and the stored value left unchanged. The ranges of acceptable values are
given in the description of each S-parameter.

If the "?" is used, the modem transmits a single line of information text to the DTE. The text
portion of this information text consists of exactly three characters, giving the value of the S­parameter in decimal, with leading zeroes included.

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Extended Syntax Commands

Command Naming Rules

Both actions and parameters have names, which are used in the related commands. Names
always begin with the character "+". Following the "+", from one to 16 additional characters
appear in the command name. These characters will be selected from the following set:

A through Z (IA5 4/1 through 5/10)

0 through 9 (IA5 3/0 through 3/9)

! (IA5 2/1)

% (IA5 2/5)

- (IA5 2/13)

. (IA5 2/14)

/ (IA5 2/15)

: (IA5 3/10)

_ (IA5 5/15)

The first character following the "+" must be an alphabetic character in the range of "A"
through "Z". This first character generally implies the application in which a command is used
(e.g., F for Fax or V for voice).

2.4.2

The modem considers lower-case characters to be the same as their upper-case equivalents.

Values

When subparameters are associated with the execution of an action, or when setting a
parameter, the command may include specification of values. This is indicated by the
appearance of <value> in the descriptions below.

<value> consists of either a numeric constant or a string constant.

Numeric Constants

Numeric constants are expressed in decimal, hexadecimal, or binary.

Decimal numeric constants consist of a sequence of one or more of the characters "0" through
"9", inclusive.

Hexadecimal numeric constants consist of a sequence of one or more of the characters "0"
through "9", inclusive, and "A" through "F" inclusive. The characters "A" through "F"
represent the equivalent decimal values 10 through 15.

Binary numeric constants consist of a sequence of one or more of the characters "0" and "1".

In all numeric constants, the most significant digit is specified first. Leading "0" characters
are ignored by the modem. No spaces, hyphens, periods, commas, parentheses, or other
generally-accepted numeric formatting characters are permitted in numeric constants; note in
particular that no "H" suffix is appended to the end of hexadecimal constants.

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String Constants

String constants consist of a sequence of displayable IA5 characters, each in the range from
2/0 to 7/15, inclusive, except for the characters ‘"’ (IA5 2/2) and "\" (IA5 5/12). String
constants are bounded at the beginning and end by the double-quote character (‘"’, IA5 2/2).

Any character value may be included in the string by representing it as a backslash ("\")
character followed by two hexadecimal digits. For example, "\0D" is a string consisting of the
single character <CR> (IA5 0/13). If the "\" character itself is to be represented in a string, it
is encoded as "\5C". The double-quote character, used as the beginning and ending string
delimiter, is represented within a string constant as "\22".

A "null" string constant, or a string constant of zero length, is represented by two adjacent
delimiters ("").

Compound Values

Actions may have more than one subparameter associated with them, and parameters may
have more than one value. These are known as "compound values", and their treatment is the
same in both actions and parameters.

A compound value consists of any combination of numeric and string values (as defined in
the description of the action or parameter). The comma character must be included as a
separator, before the second and all subsequent values in the compound value. If a value is not
specified (i.e., defaults assumed), the required comma separator must be specified; however,
trailing comma characters may be omitted if all associated values are also omitted.

2.4.3

Action Commands

Action Execution Command Syntax

There are two general types of action commands: those that have associated subparameter
values that affect only that invocation of the command, and those that have no subparameters.

If subparameters are associated with a command, the definition of the action command
indicates, for each subparameter, whether the specification of a value for that subparameter is
mandatory or optional. For optional subparameters, the definition indicates the assumed
(default) value for the subparameter if no value is specified for that subparameter; the
assumed value may be either a previous value (i.e., the value of an omitted subparameter
remains the same as the previous invocation of the same command, or is determined by a
separate parameter or other mechanism), or a fixed value (e.g., the value of an omitted
subparameter is assumed to be zero). Generally, the default value for numeric subparameters
is 0, and the default value for string subparameters is "" (empty string).

The following syntax is used for actions that have no subparameters:

+<name>

The following syntax is used for actions that have one subparameter:

+<name>[=<value>]

The following syntax is used for actions that have two or more subparameters:

+<name>[=<compound_value>]

For actions that accept subparameters, if all subparameters are defined as being optional, and
the default values for all subparameters are satisfactory, the data terminal equipment (DTE)
may use the first syntax above (i.e., omit the "=" from the action execution command as well
as all of the subparameter value string).

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If all other relevant criteria are met (e.g., the modem is in the proper state), the command is
executed with any indicated subparameters. If <name> is not recognized, the modem issues
the ERROR result code and terminates processing of the command line. An ERROR is also
generated if a subparameter is specified for an action that does not accept subparameters, if
too many subparameters are specified, if a mandatory subparameter is not specified, if a value
is specified of the wrong type, or if a value is specified that is not within the supported range.

Action Test Command Syntax

The DTE may test if an action command is implemented in the modem by using the syntax:

+<name>=?

If the modem does not recognize the indicated name, it returns an ERROR result code and
terminates processing of the command line. If the modem does recognize the action name, it
returns an OK result code. If the named action accepts one or more subparameters, the modem
sends an information text response to the DTE, prior to the OK result code, specifying the
values supported by the modem for each such subparameter, and possibly additional
information. The format of this information text is defined for each action command.

Parameter Commands

Parameter Types

Parameters may be defined as "read-only" or "read-write". "Read-only" parameters are used to
provide status or identifying information to the DTE, but cannot be set by the DTE;
attempting to set their value is an error. In some cases (specified in the description of the
individual parameter), the modem may ignore attempts to set the value of such parameters
rather than respond with an ERROR result code, if the continued correct operation of the
interface between the modem and DTE will not be affected by such action. Read-only
parameters may be read and tested.

"Read-write" parameters may be set by the DTE, to store a value or values for later use. Read­write parameters may be set, read, and tested.

Parameters may take either a single value, or multiple (compound) values. Each value may be
either numeric or string; the definition of the parameter will specify the type of value for each
subparameter. Attempting to store a string value in a numeric parameter, or a numeric value in
a string parameter, is an error.

Parameter Set Command Syntax

The definition of the parameter indicates, for each value, whether the specification of that
value is mandatory or optional. For optional values, the definition indicates the assumed
(default) value if none is specified; the assumed value may be either a previous value (i.e., the
value of an omitted subparameter retains its previous value), or a fixed value (e.g., the value
of an omitted subparameter is assumed to be zero). Generally, the default value for numeric
parameters is 0, and the default value for string parameters is "" (empty string).

2-6

The following syntax is used for parameters that accept a single value:

+<name>=[<value>]

The following syntax is used for parameters that accept more than one value:

+<name>=[<compound_value>]

For each implemented parameter, if all mandatory values are specified, and all values are
valid according to the definition of the parameter, the specified values are stored. If <name>

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is not recognized, one or more mandatory values are omitted, or one or more values are of the
wrong type or outside the permitted range, the modem issues the ERROR result code and
terminates processing of the command line. An ERROR is also generated if too many values
are specified. In case of an error, all previous values of the parameter are unaffected.

Parameter Read Command Syntax

The DTE may determine the current value or values stored in a parameter by using the
following syntax:

+<name>?

The modem responds by sending the current values stored for the parameter to the DTE in an
information text response. The format of this response is described in the definition of the
parameter. Generally, the values are sent in the same form in which they would be issued by
the DTE in a parameter setting command; if multiple values are supported, they will generally
be separated by commas, as in a parameter setting command.

Parameter Test Command Syntax

The DTE may test if a parameter is implemented in the modem, and determine the supported
values, by using the syntax:

+<name>=?

If the modem does not recognize the indicated name, it returns an ERROR result code and
terminates processing of the command line. If the modem does recognize the parameter name,
it returns an information text response to the DTE, followed by an OK result code. The
information text response indicates the values supported by the modem for each such
subparameter, and possibly additional information. The format of this information text is
defined for each parameter.

2.4.5

Additional Syntax Rules

Concatenating Commands after Extended Syntax Commands

Additional commands may follow an extended-syntax command on the same command line if
a semicolon (";") is inserted after the preceding extended command as a separator. The
semicolon is not necessary when the extended syntax command is the last command on the
command line.

Concatenating Commands after Basic Format Commands

Extended syntax commands may appear on the same command line after a basic syntax
command without a separator, in the same manner as concatenation of basic syntax
commands.

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Issuing Commands

All characters in a command line must be issued at the same data rate, and with the
same parity and format.

The modem will ignore any command line that is not properly terminated. The modem may
consider 30 seconds of mark idle time between any two characters as an improperly
terminated command line. In this case the modem may or may not generate an ERROR
message. The modem will ignore any characters received from the DTE that are not part of a
properly-formatted command line.

If the maximum number of characters that the modem can accept in the body is exceeded, an
ERROR result code is generated after the command line is terminated.

The DTE will not begin issuing a subsequent command line until at least one-tenth of a
second has elapsed after receipt of the entire result code issued by the modem in response to
the preceding command line.

Executing Commands

Upon receipt of the termination character, the modem commences execution of the commands
in the command line in the order received from the DTE. Should execution of a command
result in an error, or a character be not recognized as a valid command, execution is
terminated, the remainder of the command line is ignored, and the ERROR result code is
issued. Otherwise, if all commands execute correctly, only the result code associated with the
last command is issued; result codes for preceding commands are suppressed. If no
commands appear in the command line, the OK result code is issued.

2.6.1

Aborting Commands

Some action commands that require time to execute may be aborted while in progress; these
are explicitly noted in the description of the command. Aborting of commands is
accomplished by the transmission from the DTE to the modem of any character. A single
character is sufficient to abort the command in progress; however, characters transmitted
during the first 125 milliseconds after transmission of the termination character are ignored
(to allow for the DTE to append additional control characters such as line feed after the
command line termination character). To ensure that the aborting character is recognized

by the modem, it should be sent at the same rate as the preceding command line; the
modem may ignore characters sent at other rates. When such an aborting event is

recognized by the modem, the modem terminates the command in progress and returns an
appropriate result code to the DTE, as specified for the particular command.

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Handling of Invalid Numbers and S-Parameter Values

The modem reacts to undefined numbers and S-parameter values in one of three ways:

1. Issue the ERROR result code, and leave the previous value of the parameter unchanged;

2. Issue the OK result code, and leave the previous value of the parameter unchanged; or,

3. Issue the OK result code, and set the parameter value to the valid value nearest to that

specified in the command line.

The description of each command specifies which of these three techniques is used to handle
invalid parameter values for that command or parameter.

Modem Responses

While in command state and online command state, the modem will issue responses using the
same rate, word length, and parity as the most recently received DTE command line. In the
event that no DTE command has yet been received, rate, word length, and parity used will
depend on the capabilities of the modem.

When the modem transitions from the command state or online command state to the online
data state, the result code CONNECT should be issued at the bit rate and parity used during
the command state. When the modem transitions from the online data state to the command
state or online command state, the result codes should be issued at the bit rate used during the
online data state. Thereafter, any unsolicited result codes should use the bit rate and parity of
the last command line issued by the DTE to the modem.

2.7.1

The characters of a response will be contiguous, with no more than 100 milliseconds of mark
idle issued between characters in addition to stop elements.

Responses

There are two types of responses that may be issued by the modem: information text and
result codes.

Information Text. Information text responses consist of three parts: a header, information
text, and a trailer:

1. The characters transmitted for the header are determined by the V command.

2. The trailer consists of two characters, being the character having the ordinal value of

parameter S3 followed by the character having the ordinal value of parameter S4.

3. Information text usually consists of a single line; information text returned in response to

some commands may contain multiple lines, and the text may therefore include CR, LF,
and other formatting characters to improve readability.

Result Code Parts. Result codes consist of three parts: a header, the result text, and a trailer.

1. The characters transmitted for the header and trailer are determined by the V command

setting.

2. The result text may be transmitted as a number or as a string, also depending on a the V

command setting.

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Result Code Types. There are three types of result codes: final, intermediate, and unsolicited.
Result codes are described in Section 3.5.

1. A final result code indicates the completion of a full modem action and an ability to

accept new commands from the DTE.

2. An intermediate result code is a report of the progress of an modem action. The

CONNECT result code is an intermediate result code. In the case of a dialing or
answering command, the modem switches from command state to online data state, and
issues a CONNECT result code. This is an intermediate result code for the modem
because it cannot accept commands from the DTE while in online data state. When the
modem switches back to the command state it then issues a final result code (such as OK
or NO CARRIER).

3. Unsolicited result codes (such as RING) indicate the occurrence of an event not directly

associated with the issuance of a command from the DTE.

Extended Syntax Result Codes

Extended syntax result codes may be issued in response to either basic or extended
commands, or both. The appropriate responses are specified in the definitions of the
commands, the responses, or both.

The general format of extended syntax result codes is the same as result codes defined in TIA­602 with regard to headers and trailers. The characters specified in S-parameters S3 and S4
are used in headers and trailers of extended syntax result codes as they are in basic format
result codes. The setting of the V command affects the headers and trailers associated with
extended syntax result codes in the same manner as basic format result codes; however, unlike
basic format result codes, extended syntax result codes have no numeric equivalent, and are
always issued in alphabetic form.

Extended syntax result codes are subject to suppression by the Q1 command, as with basic
format result codes. The issuance of extended syntax result codes are not be affected by the
setting of the X command.

Extended syntax result codes may be either final, intermediate, or unsolicited; the type being
indicated in the definition of the result code.

Extended syntax result codes are prefixed by the "+" character to avoid duplication of basic
format result codes specified in TIA-602. Following the "+" character, the name of the result
code appears; result code names follow the same rules as command names.

Extended syntax result codes may include the reporting of values. The definition of the result
code specifies whether or not values are appended to the result code, and, if so, how many,
their types, and their assumed default values if omitted.

Data/voice Modes. When no values are to be reported, the result code appears in the simplest
form:

+<name>

If a single value is to be reported, the form of the result code is:

+<name>: <value>

A single space character separates the colon character from the <value>; no space appears
between the result code name and the colon. If multiple values are to be reported with the
result code, the form is:

+<name>: <compound_value>

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Fax Modes. If a single value is to be reported, the form of the result code is:

<value> or (<value>)

+<name>: <compound_value>Information Text Formats for Test Commands

In general, the format of information text returned by extended syntax commands is described
in the definition of the command.

The modem may insert intermediate <CR> characters in very long information text responses
in order to avoid overrunning DTE receive buffers. If intermediate <CR> characters are
included, the modem does not include the character sequences "0 <CR>"or "OK<CR>", so
that DTE can avoid false detection of the end of these information text responses.

Range of Values

When the action accepts a single numeric subparameter, or the parameter accepts only one
numeric value, the set of supported values may be presented in the information text as an
ordered list of values. The list is preceded by a left parenthesis (() , and is followed by a right
parenthesis ()). If only a single value is supported, it appears between the parentheses. If more
than one value is supported, then the values may be listed individually, separated by comma
characters, or, when a continuous range of values is supported, by the first value in the range,
followed by a hyphen character (-), followed by the last value in the range. The specification
of single values and ranges of values may be intermixed within a single information text. In
all cases, the supported values are indicated in ascending order.

For example, the following are some examples of value range indications:

(0) Only the value 0 is supported.

(1,2,3) The values 1, 2, and 3 are supported.

(1-3) The values 1 through 3 are supported.

(0,4,5,6,9,11,12) The several listed values are supported.

(0,4-6,9,11-12) An alternative expression of the above list.

Compound Range of Values

When the action accepts more than one subparameter, or the parameter accepts more than one
value, the set of supported values is presented as a list of the parenthetically-enclosed value
range strings described above, separated by commas. For example, the information text in
response to testing an action that accepts three subparameters, and supports various ranges for
each of them, could appear as follows:

(0),(1-3),(0,4-6,9,11-12)

This indicates that the first subparameter accepts only the value 0, the second accepts any
value from 1 through 3 inclusive, and the third subparameter accepts any of the values 0, 4, 5,
6, 9, 11, or 12.

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Data Command Set

Command Guidelines

The commands used to control and report modem operation in data modem mode are defined
in this section.

The Data Modem Mode commands and responses described in this section are applicable
when command +FCLASS=0. (See +FCLASS in Section 3.2.1 for the definition of the
FCLASS command.)

The default values are typical of a fully configured modem supporting all data rates and
options. The actual default value is dependent upon modem software as defined by the .INF
File.

Commands are accepted by the modem once the previous command has been fully executed,
which is normally indicated by the return of an appropriate result code. Execution of
commands D and A, either as a result of a direct command or a re-execute command, will be
aborted if another character is entered before completion of the handshake.

3.1.1

3.2

Escape Code Sequence

When the modem has established a connection and has entered on-line data mode, it is
possible to break into the data transmission in order to issue further commands to the modem
in an on-line command mode. This is achieved by the DTE sending to the modem a sequence
of three ASCII characters specified by register S2. The default character is '+'. The maximum
time allowed between receipt of the last character of the three escape character sequence from
the DTE and sending of the OK result code to the DTE is controlled by the S12 register.

Data Commands

The modem will respond to the commands detailed below. Parameters applicable to each
command are listed with the command description. The defaults shown correspond to default
values provided in the .INF File.

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Generic Modem Control

Z - Reset to Default Configuration

This command instructs the modem to reset to default values as altered by non-volatile
parameter storage. If the modem is connected to the line, it will be disconnected from the line,
terminating any call in progress.

All of the functions of the command are completed before the modem issues the result code.
The DTE should not include additional commands on the same command line after the Z
command because such commands are ignored.

Syntax

Z

Result Code

OK

+FCLASS - Select Active Service Class

This command selects the active service class (mode).

Syntax

+FCLASS=<mode>

Defined Values

<mode> Decimal number which corresponds to the selected service class.

0 Select Data Mode (see Section 3) (Default.)

1 Select Facsimile Class 1 Mode (see Section 4)

1.0 Select Facsimile Class 1.0 Mode (see Section 4)

8 Select Voice Mode (see Section 5)

Result Codes

OK For <mode> = 0, 1, 1.0, and 8, as supported by the .INF File.

ERROR Otherwise.

Reporting Current or Selected Values

Command: +FCLASS?

Response: +FCLASS: <mode>

Example: +FCLASS: 0 For the default setting.

3-2

Reporting Supported Range of Parameter Values

Command: +FCLASS=?

Response: +FCLASS: (<mode> range)

Example: +FCLASS: (0, 1,1.0,8)

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+VCID - Caller ID (CID)

This command controls the reporting and presentation of data associated with the Caller ID
services in the U.S. and Canada in the Incoming Call Line ID (ICLID) data format.

Syntax

+VCID=<pmode>

Defined Values

<pmode> Decimal number corresponding to the selected option.

0 Disable Caller ID reporting. (Default).

1 Enables Caller ID with formatted presentation to the

DTE. The modem will present the data items in a
<Tag><Value> pair format. The expected pairs are
data, time, caller code (telephone number), and name.

2 Enables Caller ID with unformatted presentation to

the DTE.

Reporting Current or Selected Values

Command: +VCID?

Response: +VCID: <pmode>

Example: +VCID: 0 For the default setting.

Reporting Supported Range of Parameter Values

Command: +VCID=?

Response: +VCID: (<pmode> range)

Example: +VCID: (0,1,2)

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+VRID - Report Retrieved Caller ID (CID)

This command reports the data associated with the Caller ID services in the Incoming Call
Line ID (ICLID) data format for the last received call.

Syntax

+VRID=<pmode>

Defined Values

<pmode> Decimal number corresponding to the selected option.

0 Reports Caller ID with formatted presentation to the

DTE. The modem presents the data items in a
<Tag><Value> pair format. The expected pairs are
date, time, name, and caller code (telephone number),

1 Reports Caller ID with unformatted presentation to

the DTE.

Reporting Supported Range of Parameter Values

Command: +VRID=?

Response: +VRID: (<pmode> range)

Example: +VRID: (0,1)

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\N - Operating Mode

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

Syntax

\N<mode>

Defined Values

<mode> Decimal number which corresponds to the selected mode.

0 Selects normal speed buffered mode (disables error-

correction mode) and forces &Q6 (selects
asynchronous operation in normal mode.)

1 Same as \N0.

2 Selects reliable (error-correction) mode and forces

&Q5 (the modem will try to negotiate an error
corrected link). The modem will first attempt a
LAPM connection and then an MNP connection.
Failure to make a reliable connection results in the
modem hanging up.

3 Selects auto reliable mode and forces &Q5 (the

modem will try to negotiate an error corrected link).
This operates the same as \N2 except failure to make
a reliable connection results in the modem falling
back to the speed buffered normal mode.

4 Selects LAPM error-correction mode and forces &Q5

(the modem will try to negotiate an error corrected
link). Failure to make an LAPM error-correction
connection results in the modem hanging up.

5 Selects MNP error-correction mode and forces &Q5

(the modem will try to negotiate an error corrected
link). Failure to make an MNP error-correction
connection results in the modem hanging up.

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OK <mode> = 0 to 5.

ERROR Otherwise.

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&F - Set to Factory-Defined Configuration

This command instructs the modem to set all parameters to factory default values defined in
the product Configuration Table

The modem loads the factory default configuration (profile). The factory defaults are
identified for each command and in the S-Parameter descriptions. A configuration (profile)
consists of a subset of S-Parameters.

Syntax

&F

Result Code

OK

&T - Local Analog Loopback Test

The modem will perform the local analog loopback test if &T1 is selected. The test can be run
only when in an asynchronous operation in non-error-correction mode (normal). To terminate
the test in progress, the escape sequence must be entered first (see Section 3.1.1). If S18 is
non-zero, the test will terminate automatically after the time specified by S18 and the OK
result code will be reported.

Syntax

&T[<value>]

Defined Values

<value> Decimal number corresponding to the selected value.

0 Terminates test in progress.

1 Initiates local analog loopback, V.54 Loop 3. If a

connection exists when this command is issued, the
modem hangs up. The CONNECT XXXX message is
displayed upon the start of the test.

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I - Request Identification Information

This command causes the modem to report one or more lines of product information text, as
selected by the <value> subparameter, followed by a final result code.

Syntax

I[<value>]

Defined Values

<value> Decimal number corresponding to the selected information.

0 Reports product code, e.g.:

ATI0

56000
OK

1 Reports the least significant byte of the stored

checksum in decimal (see firmware release notes).
Reports 255 if the prestored checksum value is FFh,
e.g.,

ATI1

255
OK

2 Reports OK, e.g.:

ATI2

OK

OK

3 Reports identification codes, e.g.:

ATI3

2.1.2.127
OK

4 Reports product description from the .INF file (the

response is customizable by customizing the INF
file), e.g.:

ATI4

Conexant HCF 56K Data,Fax,Speakerphone
OK

5 Reports Country Code parameter (in decimal), e.g.:

ATI5

181
OK

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6 Reports modem data pump model and internal code

revision, e.g.:

ATI6

DP Rev
V90 SPX RAM Ver 28
V90 CTL RAM Ver 28
K56FLEX SPX RAM Ver 44
K56FLEX CTL RAM Ver 47
OK

7 Reports modem data pump model and internal code

revision, e.g.:

ATI7

255
OK

8 Reports OK, e.g.:

ATI8

OK

9 Reports country, e.g.:

ATI9

USA
OK

Result Codes

OK <value> = 0-9.

ERROR Otherwise.

+GMI - Request Manufacturer Identification

This command causes the modem to report the modem product manufacturer as provided by
the .INF File.

Syntax

+GMI

Typical Response

+GMI: Conexant
OK

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+GMM - Request Model Identification

This command causes the modem to report the modem product model as provided by the .INF
File.

Syntax

+GMM

Typical Response

+GMM: HCF 56K Data, Fax, Speakerphone, PCI Modem
OK

+GMR - Request Revision Identification

This command causes the modem to report the modem version, revision level, or date as
provided by the .INF File.

Syntax

+GMR

Typical Response

+GMR: 1.0
OK

+GSN - Request Product Serial Number Identification

This command causes the modem to report the modem product model serial number as
provided by the .INF File.

Syntax

+GSN

Typical Response

+GSN:
OK

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+GOI - Request Global Object Identification

This command causes the modem to transmit one or more lines of information text identifying
the device, based on the ISO system for registering unique object identifiers. Typically, the
text consists of a single line containing numeric strings delimited by period characters. The
general format of object identifiers is defined in Section 28 of ITU-T Recommendation
X.208; the encoding rules are defined in ITU-T Recommendation X.209. The response is
provided by the .INF file.

Syntax

+GOI

Typical Response

+GOI:
OK

+GCAP - Request Complete Capabilities List

This extended-format command causes the modem to transmit one or more lines of
information text listing additional capabilities command +<name>s , which is intended to
permit the user to identify the overall capabilities of the modem. In particular, if the modem
implements a particular modem control standard that uses Extended Syntax Commands, and if
that modem control standard includes command(s) that indicate general capabilities, the
+<names>(s) of those commands will be reported to the modem in response to a +GCAP
command.

Syntax

+GCAP

Example Responses

+GCAP: +FCLASS, +MS, +ES, +DS, for a data modem that supports all capabilities
listed

Where:

+FCLASS T.class1, +F (Class 1 Facsimile modem Control)

+MS +M commands (Modulation Control: +MS and +MR commands)

+ES +E commands (Error Control: +ES, +EB, +ER, +EFCS, +ETBM)

+DS +D commands (Data Compression: +DS and +DR)

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+GCI - Country of Installation

This extended syntax command indicates and selects the country of installation for the
modem. This parameter selects the settings for any operational parameters that need to be
adjusted for national regulations or telephone networks.

Syntax

+GCI=<country_code>

Defined Values

<country_code> 8-bit country code from Annex A of T.35. The value is the

hexadecimal equivalent of the T.35 code, with bit 8 treated as the
most significant bit and bit 1 treated as the least significant bit.

Default

If the modem is specified for use in only one country, that country code is the default.
Otherwise, the default is the expected country of sale or first installation. The modem may use
hardware means to select the country of installation, in which case the modem uses that to
determine the default value.

Reporting Current or Selected Values

Command: +GCI?

Response: +GCI: <current country_code>

Example: +GCI: 3D Indicates that the modem is set for France.

Reporting Supported Range of Parameter Values

Command: +GCI=?

Response: +GCI: (<country_code>[,<country_code>[,<country_code].......]]

Example: +GCI: (20,73,B5) The modem can be set for Canada, Mexico

or the United States.

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DTE-Modem interface commands

The parameters defined in this section control the operation of the interface between the DTE
and modem.

E - Command Echo

The modem enables or disables the echo of characters to the DTE according to the parameter
supplied.

Syntax

E[value>]

Defined Values

<value> Decimal number corresponding to the selected option.

0 Disables command echo.

1 Enables command echo. (Default.)

Result Codes

OK <value> = 0 or 1.

ERROR Otherwise.

Q - Quiet Results Codes Control

The command enables or disables the sending of result codes to the DTE according to the
parameter supplied. The parameter value, if valid, is written to S14 bit 2.

Syntax

O[value>]

Defined Values

<value> Decimal number corresponding to the selected option.

0 Enables result codes to the DTE. (Default.)

1 Disables result codes to the DTE.

Result Codes

OK <value> = 0 or 1.

ERROR Otherwise.

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V - Result Code Form

This command selects the sending of short-form or long-form result codes to the DTE.

Syntax

V[value>]

Defined Values

<value> Decimal number corresponding to the selected option.

0 Enables short-form (terse) result codes. Line feed is

not issued before a short-form result code.

1 Enables long-form (verbose) result codes. (Default.)

Result Codes

OK <value> = 0 or 1.

ERROR Otherwise.

W - Connect Message Control

This command, in conjunction with S95 bits 0, 2, 3, and 5 (bits 2, 3, and 5 can be written
directly by the host or by the +MR, +ER, and +DR commands, respectively), control the
format of CONNECT messages (see Section 3.5 and Table 3-15). The actual result code
messages reported reflect the W command setting and the S95 bit settings. (Also see +MR,
+ER, and +DR commands.)

Syntax

W[value>]

Defined Values

<value> Decimal number corresponding to the selected option.

0 Upon connection, the modem reports only the DTE

speed (e.g., CONNECT 19200). Subsequent
responses are disabled. (Default.)

1 Upon connection, the modem reports the line speed,

the error correction protocol, and the DTE speed,
respectively. Subsequent responses are disabled.

2 Upon connection, the modem reports the DCE speed

(e.g., CONNECT 14400). Subsequent responses are
disabled.

3 Upon connection, the modem reports DCE speed and

the error correction protocol.

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Result Codes

OK <value> = 0-3.

ERROR Otherwise.

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X - Extended Result Codes

This command selects the subset of the result code messages used by the modem to inform
the DTE of the results of commands.

Blind dialing is enabled or disabled by country parameters. If the user wishes to enforce dial
tone detection, a "W" can be placed in the dial string (see D command). The information
below is based upon the default implementation of the X results table. Table 3-1 indicates the
messages which are enabled for each X value.

If the modem is in facsimile mode (+FCLASS=1, or 1.0), the only message sent to indicate a
connection is CONNECT without a speed indication.

Syntax

X<value>

Defined Values

<value> Decimal number corresponding to the selected option.

0 CONNECT result code is given upon entering online

data state. Dial tone and busy detection reporting are
disabled.

1 CONNECT <text> result code is given upon entering

online data state. Dial tone and busy detection
reporting are disabled.

2 CONNECT <text> result code is given upon entering

online data state. Dial tone detection reporting is
enabled, and busy detection reporting is disabled.

3 CONNECT <text> result code is given upon entering

online data state. Dial tone detection reporting is
disabled, and busy detection reporting is enabled.

4 CONNECT <text> result code is given upon entering

online data state. Dial tone and busy detection
reporting are both enabled. (Default.)

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Result Codes

OK <value> = 0 to 4.

ERROR Otherwise.

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Table 3-1. Result Codes

Short Form Long Form n Value in ATXn Command Notes

0 1 2 3 4

+F4+FCERROR xxxxx

0 OK xxxxx

1 CONNECT xxxxx
2 RING xxxxx

3 NO CARRIER xxxxx
4 ERROR xxxxx

5 CONNECT 1200 1 xxxx
6 NO DIALTONE 33xxx

7 BUSY 333xx
8 NO ANSWER xxxxx

9 CONNECT 600 1xxxx
10 CONNECT 2400 1 xxxx

11 CONNECT 4800 1 xxxx
12 CONNECT 9600 1 xxxx

13 CONNECT 7200 1 xxxx
14 CONNECT 12000 1 xxxx

15 CONNECT 14400 1 xxxx
16 CONNECT 19200 1 xxxx

17 CONNECT 38400 1 xxxx
18 CONNECT 57600 1 xxxx

19 CONNECT 115200 1 xxxx
20 CONNECT 230400 xxxxx

22 CONNECT 75TX/1200RX 1 xxxx
23 CONNECT 1200TX/75RX 1 xxxx

24 DELAYED 4444x
32 BLACKLISTED 4444x

33 FAX xxxxx
35 DATA xxxxx

40 +MRR: 300 xxxxx
44 +MRR: 1200/75 xxxxx

45 +MRR: 75/1200 xxxxx
46 +MRR: 1200 xxxxx

47 +MRR: 2400 xxxxx
48 +MRR: 4800 xxxxx

49 +MRR: 7200 xxxxx
50 +MRR: 9600 xxxxx

51 +MRR: 12000 xxxxx
52 +MRR: 14400 xxxxx

53 +MRR: 16800 xxxxx
54 +MRR: 19200 xxxxx

55 +MRR: 21600 xxxxx
56 +MRR: 24000 xxxxx

57 +MRR: 26400 xxxxx
58 +MRR: 28800 xxxxx

59 CONNECT 16800 1 xxxx
61 CONNECT 21600 1 xxxx

62 CONNECT 24000 1 xxxx

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Table 3-1. Result Codes (Continued)

Short Form Long Form n Value in ATXn Command Notes

0 1 2 3 4

63 CONNECT 26400 1 x x x x
64 CONNECT 28800 1 x x x x

66 +DR: ALT xxxxx
67 +DR: V42B xxxxx

69 +DR: NONE xxxxx
70 +ER: NONE xxxxx

77 +ER: LAPM xxxxx
78 +MRR: 31200 xxxxx

79 +MRR: 33600 xxxxx
80 +ER: ALT xxxxx

83 LINE IN USE xxxxx
84 CONNECT 33600 1 x x x x

91 CONNECT 31200 1 x x x x

134+MCR: B103 xxxxx

135+MCR: B212 xxxxx
136+MCR: V21 xxxxx

137+MCR: V22 xxxxx
138+MCR: V22B xxxxx

139+MCR: V23 xxxxx
140+MCR: V32 xxxxx

141+MCR: V32B xxxxx
142+MCR: V34 xxxxx

144+MCR: K56 xxxxx
145+MCR: V90 xxxxx

150 +MRR: 32000 xxxxx
151 +MRR: 34000 xxxxx

152 +MRR: 36000 xxxxx
153 +MRR: 38000 xxxxx

154 +MRR: 40000 xxxxx
155 +MRR: 42000 xxxxx

156 +MRR: 44000 xxxxx
157 +MRR: 46000 xxxxx

158 +MRR: 48000 xxxxx
159 +MRR: 50000 xxxxx

160 +MRR: 52000 xxxxx
161 +MRR: 54000 xxxxx

162 +MRR: 56000 xxxxx
165 CONNECT 32000 xxxxx

166 CONNECT 34000 xxxxx
167 CONNECT 36000 xxxxx

168 CONNECT 38000 xxxxx
169 CONNECT 40000 xxxxx

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Table 3-1. Result Codes (Continued)

Short Form Long Form n Value in ATXn Command Notes

0 1 2 3 4

170 CONNECT 42000 xxxxx
171 CONNECT 44000 xxxxx

172 CONNECT 46000 xxxxx
173 CONNECT 48000 xxxxx

174 CONNECT 50000 xxxxx
175 CONNECT 52000 xxxxx

176 CONNECT 54000 xxxxx
177 CONNECT 56000 xxxxx

178 CONNECT 230400 xxxxx
180 CONNECT 28000 xxxxx

181 CONNECT 29333 xxxxx
182 CONNECT 30667 xxxxx

183 CONNECT 33333 xxxxx
184 CONNECT 34667 xxxxx

185 CONNECT 37333 xxxxx
186 CONNECT 38667 xxxxx

187 CONNECT 41333 xxxxx
188 CONNECT 42667 xxxxx

189 CONNECT 45333 xxxxx
190 CONNECT 46667 xxxxx

191 CONNECT 49333 xxxxx
192 CONNECT 50667 xxxxx

193 CONNECT 53333 xxxxx
194 CONNECT 54667 xxxxx

195 +MRR: 28000 xxxxx
196 +MRR: 29333 xxxxx

197 +MRR: 30667 xxxxx
198 +MRR: 33333 xxxxx

199 +MRR: 34667 xxxxx
200 +MRR: 37333 xxxxx

201 +MRR: 38667 xxxxx
202 +MRR: 41333 xxxxx

203 +MRR: 42667 xxxxx
204 +MRR: 45333 xxxxx

205 +MRR: 46667 xxxxx
206 +MRR: 49333 xxxxx

207 +MRR: 50667 xxxxx
208 +MRR: 53333 xxxxx

209 +MRR: 54667 xxxxx

Notes:

1. An 'x' in a column indicates that the message (either the long form if verbose, or the value only for short form) will
be generated when that particular value of 'n' (shown at the top of the column) has been selected by the use of
ATXn. If the column is blank, then no message will be generated for that x option. A numeral indicates which less
explicit message (verbose or short form) will be output for that X option. (Also, see Section 3.3).

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&C - RLSD Behavior

This parameter determines how the state of the Received Line Signal Detector (RLSD) output
relates to the detection of received line signal from the distant end. Changing the parameter
will take effect immediately in both the command and online command states.

In &C1 mode of operation, RLSD is not turned off until all data previously received from the
remote modem is delivered to the local DTE. However, such buffered data will be discarded
and RLSD will be turned off if the DTE turns off DTR (if &D1 or &D2 is set).

Syntax

&C[<value>]

Defined Values

<value> Decimal number corresponding to the selected option.

0 RLSD is always ON.

1 RLSD follows the state of the carrier. (Default.)

Result Code

OK <value> = 0 or 1

ERROR Otherwise.

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&D - DTR Behavior

This parameter determines how the modem responds when the Data Terminal Ready (DTR)
input is changed from the ON to the OFF condition during online data state.

Syntax

&D[<value>]

Defined Values

<value> Decimal number corresponding to the selected option.

0 Modem ignores DTR.

1 Upon an on-to-off transition of DTR, the modem

enters online command state and issues an OK result
code; the call remains connected.

2 Upon an on-to-off transition of DTR, the modem

instructs the underlying modem to perform an orderly
cleardown of the call. The disposition of any data in
the modem pending transmission to the remote
modem is controlled by the +ETBM parameter;
otherwise, this data is sent before the call is cleared,
unless the remote modem clears the call first (in
which case pending data is discarded). The modem
disconnects from the line. Automatic answer is
disabled while DTR remains off.

Result Code

OK <value> = 0 or 2

ERROR Otherwise.

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&K - Flow Control

This command defines the DTE/DCE (terminal/modem) flow control mechanism.

Syntax

&K[<value>]

Defined Values

<value> Decimal number corresponding to the selected option.

0 Disables flow control.

3 Enables RTS/CTS flow control. (Default for data

modem modes.)

4 Enables XON/XOFF flow control.

5 Included for compatibility only and has no effect

other than returning an OK result code.

6 Included for compatibility only and has no effect

other than returning an OK result code.

Result Codes

OK <value> = 0, 3, 4, 5, or 6.

ERROR Otherwise.

&M - Asynchronous/Synchronous Mode Selection

This command is included for compatibility only and has no effect other than returning a
result code. The only valid values are 0-3.

Syntax

&M[<mode>]

Defined Values

<mode > Decimal number corresponding to the selected value: 0-3.

Result Codes

OK <mode> = 0 to 3.

ERROR Otherwise.

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&Q - Sync/Async Mode

This command determines the DTR operating mode. (Also, see \N.)

NOTE: When the &Q0 is issued to select the mode, the subsequent connect message will
report the DCE speed regardless of the W command and S95 settings.

Syntax

&Q[<mode>]

Defined Values

<mode > Decimal number corresponding to the selected mode:

0 Selects asynchronous operation in normal mode

(speed buffering)

1 Selects asynchronous operation in normal mode

(speed buffering)

2 Selects asynchronous operation in normal mode

(speed buffering)

3 Selects asynchronous operation in normal mode

(speed buffering)

5 Selects asynchronous operation in error correction

mode

6 Selects asynchronous operation in normal mode

(speed buffering)

Result Codes

OK <mode > = 0-3, 5, 6.

ERROR Otherwise.

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+IPR - Fixed DTE Rate

This numeric extended-format parameter specifies the data rate at which the modem will
accept commands during online 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

+IPR=<rate>

Defined Values

<rate> Specifies the DTE-modem interface operation rate in bits/s. The

available rates are:

0, 2400, 4800, 9600, 19200, 38400, 57600, or 115200.

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: +IPR?

Response: +IPR: <rate>

Example 1: +IPR: 0 for automatic rate detection.

Example 2: +IPR: 57600 for 57600 bps.

Reporting Supported Range of Parameter Values

Command: +IPR=?

Response: +IPR (<rate> range)

Example: +IPR: (0, 2400,4800,9600,19200,38400,57600,115200)

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+IFC - DTE-Modem Local Flow Control

This extended-format compound parameter controls the operation of local flow control
between the DTE and the modem during the data state when V.42 error control is used, or
when fallback to non-error control mode is specified to include buffering and flow control. It
accepts two numeric subparameters.

Syntax

+IFC=[<modem_by_DTE>[,<DTE_by_modem>]]

Defined Values

<modem_by_DTE> Specifies the method to be used by the DTE to control the flow of

received data from the modem.

0None.

1 XON/XOFF on transmitted data (XON/XOFF on

transmit data); do not pass XON/XOFF characters to
the remote modem.

2 Circuit 133 (Ready for Receiving). (Default.)

<DTE_by_modem> Specifies the method to be used by the modem to control the flow

of transmitted data from the DTE.

0None.

1 XON/XOFF on received data.

2 CTS/RTS. (Default.)

Reporting Current or Selected Values

Command: +IFC?

Response: +IFC: <modem_by_DTE>,<DTE_by_modem>

Example: +IFC: 2,2 for the defaults.

Reporting Supported Range of Parameter Values

Command: +IFC=?

Response: +IFC: (<modem_by_DTE> range),(<DTE_by_modem> range)

Example: +IFC: (0-2),(0-2)

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+ILRR - DTE-Modem Local Rate Reporting

This extended-format numeric parameter controls whether or not the extended-format
+ILRR:<rate> information text is transmitted from the modem to the DTE.

Syntax

+ILRR=<value>

Defined Values

<value> Decimal number corresponding to the selected option.

0 Disables reporting of local port rate (+ILRR: is not

transmitted).

1 Enables reporting of local port rate (+ILRR: is

transmitted).

Reporting Current or Selected Values

Command: +ILRR?

Response: +ILRR: <current value>

Example: +ILRR: 0 For the default setting

Reporting Supported Range of Parameter Values

Command: +ILRR=?

Response: +ILRR: (<value> range)

Example: +ILRR: (0,1)

Reported Rate

The <rate> reported represents the current (negotiated or renegotiated) DTE-modem rate. If
enabled, the intermediate result code is transmitted after any modulation, error control or data
compression reports are transmitted, and before any final result code (e.g., CONNECT) is
transmitted. The <rate> is applied after the final result code is transmitted.

The DTE-modem port rate will change only if neither buffered mode nor error controlled
means are enabled (+ES=x,0) and if the negotiated carrier rate (+MRR) does not match the
current DTE-modem port rate (autodetected from the previous command line).

Syntax

+ILRR: <rate>[,<rx_rate>]

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Defined Values

<rate> Decimal value representing the current (negotiated or renegotiated)

DTE-modem rate:

0, 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, or
115200

<rx_rate> Optional decimal value reporting the RXD rate, if it is different

from the TXD rate:

0, 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, or
115200

Example

+ILRR: 19200

Call Control

D - Dial

This command directs the modem to go on-line, dial according to the entered string and
attempt to establish a connection. If no dial string is supplied, the modem will go on-line and
attempt the handshake in originate mode. NOTE: If the ATD command is issued before the
S1 register has cleared, the modem will respond with the NO CARRIER result code.

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

If +FCLASS=1 or 1.0 is selected, the modem will behave as a facsimile modem and attempt
to connect to a facsimile machine (or modem) by entering the HDLC V.21 channel 2 receive
state (as if +FRH=3 had been issued). This command will be aborted upon receipt of any DTE
character if the modem has not finished dialing. In this case, the modem will go on-hook and
return to command mode after displaying the NO CARRIER message. If the modem finishes
dialing, it will proceed as if the +FRH=3 command is issued. (Refer to the +FRH command to
determine how the modem behaves following this stage.)

Syntax

D<modifier>

Defined Values

<modifier> The valid dial string parameters (modifiers) are described below.

Punctuation characters may be used for clarity, with parentheses,
hyphen, and spaces ignored.

0-9 DTMF digits 0 to 9.

A-D DTMF digits A, B, C, and D. Some countries may prohibit sending

of these digits during dialing.

L Re-dial last number: the modem will re-dial the last valid

telephone number. The L must be immediately after the D with all
the following characters ignored).

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P Select pulse dialing: pulse dial the numbers that follow until a "T"

is encountered. Affects current and subsequent dialing. Some
countries prevent changing dialing modes after the first digit is
dialed.

T Select tone dialing: tone dial the numbers that follow until a "P" is

encountered. Affects current and subsequent dialing. Some
countries prevent changing dialing modes after the first digit is
dialed.

W Wait for dial tone: the modem will wait for dial tone before dialing

the digits following "W". If dial tone is not detected within the
time specified by S7 or S6, the modem will abort the rest of the
sequence, return on-hook, and generate an error message.

* The 'star' digit (tone dialing only).

# The 'gate' digit (tone dialing only).

+

! Flash: the modem will go on-hook for a time defined by the value

of S29. Country requirements may limit the time imposed.

@ Wait for silence: the modem will wait for at least 5 seconds of

silence in the call progress frequency band before continuing with
the next dial string parameter. If the modem does not detect these 5
seconds of silence before the expiration of the call abort timer (S7),
the modem will terminate the call attempt with a NO ANSWER
message. If busy detection is enabled, the modem may terminate
the call with the BUSY result code. If answer tone arrives during
execution of this parameter, the modem will handshake.

$ Wait for credit card dialing tone before continuing with the dial

string. If the tone is not detected within the time specified by S7 or
S6, the modem will abort the rest of the sequence, return on-hook,
and generate an error message.

& Wait for credit card dialing tone before continuing with the dial

string. If the tone is not detected within the time specified by S7 or
S6, the modem will abort the rest of the sequence, return on-hook,
and generate an error message.

, Dial pause: the modem will pause for a time specified by S8 before

dialing the digits following ",".

; Return to command state. Added to the end of a dial string. This

causes the modem to return to the command state after it processes
the portion of the dial string preceding the ";". This allows the user
to issue additional commands while remaining off-hook. The
additional commands may be placed in the original command line
following the ";" and/or may be entered on subsequent command
lines. The modem will enter call progress only after an additional
dial command is issued without the ";" terminator. Use "H" to
abort the dial in progress, and go back on-hook.

^ Toggles calling tone enable/disable: applicable to current dial

attempt only.

( ) Ignored: may be used to format the dial string.

- Ignored: may be used to format the dial string.

<space> Ignored: may be used to format the dial string.

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T - Set Tone Dial Default

This command forces DTMF dialing until the next P dial modifier or P command is received.
The modem will set an S-Parameter bit to indicate that all subsequent dialing should be
conducted in tone mode. Note that the DP command will override this command. Clears S14
bit 5.

This command may not be permitted in some countries. (See P.)

Syntax

T

Result Codes

OK

P - Set Pulse Dial Default

This command forces pulse dialing until the next T dial modifier or T command is received.
Sets S14 bit 5.

As soon as a dial command is executed which explicitly specifies the dialing mode for that
particular call (e.g., ATDT..), this command is overridden so that all future dialing will be
tone dialed. (See T command.)

This command may not be permitted in some countries.

A - Answer

The modem will go off-hook and will attempt to answer an incoming call if correct conditions
are met. Upon successful completion of answer handshake, the modem will go on-line in
answer mode. This command may be affected by the state of Line Current Sense, if enabled.
(Most countries do not require Line Current Sense.) Operation is also dependent upon
+FCLASS command and country-specific requirements.

If +FCLASS=0 is selected, the modem will enter the connect state after exchanging carrier
with the remote modem. If no carrier is detected within a period specified in register S7, the
modem will hang up. Any character entered during the connect sequence will abort the
connection attempt.

If +FCLASS=1.0 is selected, the modem will go off-hook in V.21 answer mode. It will
generate the V.21 2100 Hz answer tone for 3 ± 0.5 seconds. Following a delay of 70 ms, it
will proceed as if the +FTH=3 command were issued. At any stage up to (but excluding) the
+FTH=3 command state, any character will abort the communication. (See the description of
the +FTH command for details.)

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H - Disconnect (Hang-Up)

This command initiates a hang up sequence. This command may not be available for some
countries due to PTT restrictions.

Syntax

H[<value>]

Defined Values

<value> Decimal number corresponding to the selected option.

0 The modem will release the line if the modem is

currently on-line.

1 If on-hook, the modem will go off-hook and remain

in command mode.

Result Codes

OK <value> = 0 or 1.

ERROR Otherwise.

O - Return to On-Line Data Mode

This command specifies that the modem will enter the on-line data mode from the on-line
command mode with or without a retrain. If in the off-line command mode when this
command is entered, the modem reports ERROR.

Syntax

O[<value>]

Defined Values

<value> Decimal number corresponding to the selected option.

0 Enters on-line data mode from the on-line command

mode without a retrain. Handling is determined by
the Call Establishment task. Generally, if a
connection exists, this command connects the DTE
back to the remote modem after an escape (+++).

1 Performs a retrain then enters on-line data mode from

the on-line command mode.

Result Codes

OK <value> = 0 or 1 and a connection exists.

ERROR Otherwise or no connection exists.

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L - Speaker Volume

This command sets the speaker volume control according to the parameter supplied.

Syntax

L[<value>]

Defined Values

<value> Decimal number corresponding to the selected option.

0Off.

1 Low volume. (Default.)

2 Medium volume.

3 High volume.

Result Codes

OK <value> = 0 to 3.

ERROR Otherwise.

M - Speaker Control

This command controls speaker on or off according to the supplied parameter.

Syntax

M[<value>]

Defined Values

<value> Decimal number corresponding to the selected option.

0 Speaker off.

1 Speaker on during call establishment, but off when

receiving carrier. (Default.)

2 Speaker on.

3 Speaker is off when receiving carrier and during

dialing, but on during answering.

Result Codes

OK <value> = 0 to 3.

ERROR Otherwise.

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&G - Select Guard Tone

This command is included for compatibility only and has no effect other than returning an
OK result code.

Syntax

&G[<value>]

Defined Values

<value> Decimal number corresponding to the selected option.

0 Included for compatibility only and has no effect

other than returning an OK result code. (Default.)

1 Included for compatibility only and has no effect

other than returning an OK result code.

2 Included for compatibility only and has no effect

other than returning an OK result code.

Result Code

OK <value> = 0 to 2.

ERROR Otherwise.

&P - Select Pulse Dial Make/Break Ratio

This command determines the make/break ratio used during pulse dialing. It is only effective
if the appropriate bit to enable this command is set through the .INF File. If enabled, it will
override the make/break ratios in the OEM parameters in the .INF File. The default is
country-dependent.

Syntax

&P[<value>]

Defined Values

<value> Decimal number corresponding to the selected information.

0 Selects 39%-61% make/break ratio at 10 pulses per

second. (Default.)

1 Selects 33%-67% make/break ratio at 10 pulses per

second.

2 Selects 39%-61% make/break ratio at 20 pulses per

second.

3 Selects 33%-67% make/break ratio at 20 pulses per

second.

Result Codes

OK <value> = 0 to 3.

ERROR Otherwise.

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&V - Display Current Configuration and Stored Profile

This command reports the current (active) configuration and the stored (user) profiles.

Syntax

&V

Result Code

OK

Example:

AT&V
ACTIVE PROFILE:
E1 L1 M1 Q0 T V1 X0 &C1 &D2 &G0 &T0
S00:000 S01:000 S02:043 S03:013 S04:010 S05:008 S06:004
S07:050 S08:004
S10:014 S12:050 S16:000 S18:000 S29:070

STORED PROFILE 0:
E1 L1 M1 Q0 T V1 X4 &C1 &D2 &G0 &T0
S00:000 S02:043 S06:004 S07:050 S08:004 S10:014 S12:050
S18:000 S29:070

OK

&W - Store Current Configuration

This command saves the current (active) configuration (profile), including S-Parameters, in
the Registry. The current configuration is comprised of a list of storable parameters illustrated
in the &V command. These settings are restored to the active configuration upon receiving an
Z command or at power up.

Syntax

&W

Result Code

OK

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*B - Display Blacklisted Numbers

This command requests the modem to return a list of blacklisted numbers to the DTE. The
format of the response is shown by the example below. Permanently forbidden numbers as
defined by country requirements will not appear on this list. If no numbers are blacklisted,
only the OK result code is issued.

Example:

NO. - PHONE NUMBER -

------ ------------------------------

1; 4175537660
2; 8288924961
3; 3887278862
4; 3124839442
5; 6284664

OK

*D - Display Delayed Numbers

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

Example:

NO. - PHONE NUMBER -DELAY

------ -------------------------------------------

1; 8264734660 2:00:00
2; 7532634661 2:00:00
3; 2587334662 0:02:00
4; 7532651663 0:03:25
5; 7459931664 0:01:45

OK

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Modulation Control Commands

+MS - Modulation Selection

This extended-format compound parameter controls the manner of operation of the
modulation capabilities in the modem. It accepts six subparameters.

Syntax

+MS=[<carrier>[,<automode>[,<min_tx_rate>[,<max_tx_rate>[,<min_rx_rate>
[,<max_rx_rate>]]]]]]

Where: Possible <carrier>, <min_tx_rate>, <max_tx_rate>,

<min_rx_rate>, and <max_rx_rate> values are listed in Table 3-2.

Table 3-2. +MS Command Supported Rates

Modulation <carrier> Possible (<min_rx_rate>, <min_rx_rate>, (<min_tx_rate>),

Bell 103 B103 300
Bell 212 B212 1200 Rx/75 Tx or 75 Rx/1200 Tx

V.21 V21 300
V.22 V22 1200

V.22 bis V22B 2400 or 1200
V.23 V23C 1200

V.32 V32 9600 or 4800
V.32 bis V32B 14400, 12000, 9600, 7200, or 4800

V.34 V34

K56flex K56

V.90 V90 56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667,

V.92 downstream V92

V.92 upstream V92

33600, 31200, 28800, 26400, 24000, 21600, 19200, 16800,
14400, 12000, 9600, 7200, 4800, or 2400

56000, 54000, 52000, 50000, 48000, 46000, 44000, 42000,
40000, 38000, 36000, 34000, 32000

45333, 44000, 42667, 41333, 40000, 38667, 37333, 36000,
34667, 33333, 32000, 30667, 29333, 28000

56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667,
45333, 44000, 42667, 41333, 40000, 38667, 37333, 36000,
34667, 33333, 32000, 30667, 29333, 28000

48000, 46667, 45333, 44000, 42667, 41333, 40000, 38667,
37333, 36000, 34667, 33333, 32000, 30667, 29333, 28000,
26667, 25333, 24000

and <max_tx_rate>) Rates (bps)

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Defined Values

<carrier> A string which specifies the preferred modem carrier to use in

originating or answering a connection. <carrier> values are strings
of up to eight characters, consisting only of numeric digits and
upper case letters. <carrier> values for ITU standard modulations
take the form: <letter><1-4 digits><other letters as needed>.
Defined values are listed in Table 3-1.

<automode> A numeric value which enables or disables automatic modulation

negotiation (e.g., ITU-T V.32bis Annex A or V.8).

0 Automode disabled.

1 Automode enabled. (Default.)

<min_rx_rate> and

<max_rx_rate> Numeric values which specify the lowest (<min_rx_rate>) and

highest (<max_rx_rate>) rate at which the modem may establish a
receive connection. May be used to condition distinct limits for the
receive direction as distinct from the transmit direction. Values for
this subparameter are decimal encoded, in units of bit/s. The
possible values for each modulation are listed in Table 3-1. Actual
values will be limited to possible values corresponding to the
entered <carrier> and fall-back <carrier> as determined during
operation. (Default = lowest (<min_rx_rate>) and highest
(<max_rx_rate>) rate supported by the selected carrier.)

<min_tx_rate> and

<max_tx_rate> Numeric values which specify the lowest (<min_tx_rate>) and

highest (<max_tx_rate>) rate at which the modem may establish a
transmit connection. Non-zero values for this subparameter are
decimal encoded, in units of bit/s. The possible values for each
modulation are listed in Table 3-1. Actual values will be limited to
possible values corresponding to the entered <carrier> and fall­back <carrier> as determined during operation. (Default = lowest
(<min_tx_rate>) and highest (<max_tx_rate>) rate supported by
the selected carrier.)

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Reporting Current or Selected Values

Command: +MS?

Response: +MS:

<carrier>,<automode>,<min_tx_rate>,<max_tx_rate>,<min_rx_rate>,<max_rx_
rate>

Note: The current active settings are reported under control of the +MR parameter.

Example: +MS: K56, 1,75,33600,75,56000

For default values. This example allows maximum system flexibility to
determine optimal receive and transmit rates during operation.

Reporting Supported Range of Parameter Values

Command: +MS=?

Response: +MS: (<carrier> range),(<automode> range),(<min_tx_rate> range),

(<max_tx_rate> range),(<min_rx_rate> range), (<max_rx_rate> range)

Example: +MS: (B103,B212,V21,V22,V22B,V23C,V32,V32B,V34,

K56,V90),(0,1),(75-33600),(75-33600),(75-56000),(75-56000)

Result Code

OK Valid subparameter string

ERROR Otherwise.

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+MR - Modulation Reporting Control

This extended-format numeric parameter controls whether or not the extended-format +MCR:
<carrier> and +MRR: <rate> intermediate result codes are transmitted from the modem to the
DTE (see Section 3.5 and Table 3-14). If enabled, +MCR: <carrier> and +MRR: <rate>
intermediate result codes represent the current (negotiated or renegotiated) modulation
<carrier> and <rate> that are transmitted at the point during connect negotiation
(handshaking) at which the modem has determined which modulation and rate will be used,
i.e., before any Error Control or Data Compression reports are transmitted, and before any
final result code (e.g., CONNECT) is transmitted.

S95 bit 2 is reset to 0 for +MR=0 and is set to a 1 for +MR=1 or +MR=2. The more recent
setting of +MR or S95 bit 2, and the W command setting, determines modulation result code
reporting (see S95 Parameter and W Command).

Syntax

+MR=[<value>]

Defined Values

<value> A decimal number corresponding to the selected option:

0 Disables reporting of modulation connection (+MCR:

and +MRR: are not transmitted).

1 Enables reporting of modulation connection (+MCR:

and +MRR: are transmitted). (Default.)

2 Enables reporting of modulation connection (+MCR:

and Receive Rate Only: are transmitted).

Reporting Current or Selected Values

Command: +MR?

Response: +MR: <current value>

Example: +MR: 1 For default setting

Reporting Supported Range of Parameter Values

Command: +MR=?

Response: +MR: (<value>range)

Example: +MR: (0,1,2)

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+MCR: Report Syntax

Response: +MCR: <carrier>

<carrier> Alphanumeric code corresponding to the reported carrier. Defined

values are:

B103 For Bell 103

B212 For Bell 212

V21 For V.21

V22 For V.22

V22B For V.22bis

V23C For V.23

V32 For V.32

V32B For V.32bis

V34 For V.34

K56 For K56flex

V90 For V.90

V92 For V.92

+MRR: Report Syntax

Response: +MRR: <tx_rate>,<rx_rate>

<tx_rate> Decimal transmit rate in bits/s.

<rx_rate> Decimal receive rate in bits/s.

Example: +MRR: 28800, 48000

%E - Enable/Disable Line Quality Monitor, Auto-Retrain, and Auto-Rate
Renegotiation

This command controls whether or not the modem will automatically monitor the line quality
and request a retrain (%E1) or a rate renegotiation when line quality merits a change. If
enabled, the modem attempts to retrain for a maximum of 30 seconds.

Syntax

%E[<value>]

Defined Values

<value> A decimal number corresponding to the selected option:

0 Disable line quality monitor, auto-retrain, and auto-

rate renegotiation.

1 Enable line quality monitor, auto-retrain, and auto-

rate renegotiation. (Default.)

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Result Code

OK <value> = 0 and 1

ERROR Otherwise.

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Error Control Commands

This section describes parameters used to select and operate the modem in V.42 LAPM or
MNP error control mode, Normal (Buffered) Mode, or V.80 Synchronous Access Mode.

+ES - Error Control and Synchronous Mode Selection

This extended-format command specifies the initial requested mode of operation when the
modem is operating as the originator, optionally specifies the acceptable fallback mode of
operation when the modem is operating as the originator, and optionally specifies the
acceptable fallback mode of operation when the modem is operating as the answerer. It
accepts three numeric subparameters:

Syntax

+ES=[<orig_rqst>[,<orig_fbk>[,<ans_fbk>]]]

Defined Values

<orig_rqst> Decimal number which specifies the initial requested mode of

operation when the modem is operating as the originator. The
options are:

0 Initiate call with Direct Mode.

1 Initiate call with Normal Mode (also referred to as

Buffered Mode or Direct Mode) only.

2 Initiate V.42 without Detection Phase. If V.8 is in

use, disable V.42 Detection Phase.

3 Initiate V.42 with Detection Phase. (Default.)

4 Initiate MNP.

6 Initiate V.80 Synchronous Access Mode when

connection is completed, and Data State is entered.
(See +ESA and +ITF commands.)

<orig_fbk> Decimal number which specifies the acceptable fallback mode of

operation when the modem is operating as the originator.

0 LAPM, MNP, or Normal Mode error control

optional. (Default.)

1 LAPM, MNP, or Direct Mode error control optional.

2 LAPM or MNP error control required; disconnect if

error control is not established.

3 LAPM error control required; disconnect if error

control is not established.

4 MNP error control required; disconnect if error

control is not established.

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<ans_fbk> Decimal number which specifies the acceptable fallback mode of

operation when the modem is operating as the answerer or
specifies V.80 Synchronous Access Mode.

1 Error control disabled, use Normal Mode.

2 LAPM, MNP, or Normal Mode error control

optional. (Default.)

3 LAPM, MNP, or Direct Mode error control optional.

4 LAPM or MNP error control required; disconnect if

error control is not established.

5 LAPM error control required; disconnect if error

control is not established.

6 MNP error control required; disconnect if error

control is not established.

8 Initiate V.80 Synchronous Access Mode when

connection is completed, and Data State is entered
(see +ESA and +ITF commands).

Examples

+ES=6 Enable V.80 Synchronous Access Mode originator

+ES=,,8 Enable V.80 Synchronous Access Mode answerer

+ES=6,,8 Enable V.80 Synchronous Access Mode originator and answerer

+ES=3 Enable V.42 with Detection Phase originator. Disable V.80 Synchronous

Access Mode originator.

+ES=,,2 Allow LAPM, MNP, or Normal Mode connection answerer. Disable V.80

Synchronous Access Mode answerer.

+ES=3,,2 Enable V.42 with Detection Phase originator, allow LAPM, MNP, or

Normal Mode connection answer. Disable Synchronous Access Mode
originator and answerer.

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Reporting Current or Selected Values

Command: +ES?

Response: +ES: <orig_rqst>,<orig_fbk>,<ans_fbk>

Example: +ES: 3,0,2 For default settings.

+ES: 6,0,8 For V.80 Synchronous Access Mode

originator and answerer.

Reporting Supported Range of Parameter Values

Command: +ES=?

Response: +ES: (<orig_rqst> range),( <orig_fbk> range), (<ans_fbk> range)

Example: +ES: (0-4,6),(0-4),(0-6,8)

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+EB - Break Handling in Error Control Operation

This extended-format compound parameter controls the break handling in V.42 operation. It
accepts three numeric subparameters:

Syntax

+EB=[<break_selection>[,<timed>[,<default_length>]]]

Defined Values

<break_selection> Decimal number 0 specifying that break is to be ignored, i.e., not

signaled to remote DCE.

<timed> Decimal number 0 specifying that any transmitted V.42 L-

SIGNAL will not indicate break signal length

<default_length> Decimal number 0 specifying that break is not delivered to the

DTE.

Reporting Current or Selected Values

Command: +EB?

Response: +EB: <break_selection>,<timed>,<default_length><CR>

Example: +EB: 0,0,0 For default settings.

Reporting Supported Range of Parameter Values

Command: +EB=?

Response: +EB: (<break_selection> range),(<timed> range), (default_length> range)

Example: +EB: (0),(0),(0)

+ESR - Selective Repeat

This extended-format numeric parameter controls the use of the selective repeat (SREJ)
option in V.42.

Syntax

+ESR=[<value>].

Defined Values

<value> Decimal number 0 specifying that SREJ is not used.

Example:

+ESR:0 For default settings.

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+EFCS - 32-bit Frame Check Sequence

This extended-format numeric parameter controls the use of the 16-bit or 32-bit frame check
sequence (FCS) option in V.42.

Syntax

+EFCS=[<value>]

Defined Values

<value> Decimal number 0 specifying the use of the 16-bit FCS specified

in V.42.

Reporting Current or Selected Values

Command: +EFCS?

Response: +EFCS: <value>

Example: +EFCS: 0 For default setting.

Reporting Supported Range of Parameter Values

Command: +EFCS=?

Response: +EFCS: (<value> range)

Example: +EFCS: (0)

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+ER - Error Control Reporting

This extended-format numeric parameter controls whether or not the extended-format "+ER: "
intermediate result code is transmitted from the modem to the DTE (see Section 3.5 and Table
3-15).

S95 bit 3 is reset to 0 for +ER=0 and is set to a 1 for +ER=1. The more recent setting of +ER
or S95 bit 3, and the W command setting, determines the actual error control result code
reporting (see S95 Parameter and W Command).

Syntax

+ER=[<value>]

Defined Values

<value> A decimal number corresponding to the selected error control

option:

0 Error control reporting disabled (no +ER

intermediate result code transmitted).

1 Error control reporting enabled (+ER intermediate

result code transmitted). (Default.)

Reporting Current or Selected Values

Command: +ER?

Response: +ER: <current value>

Example: +ER: 1 for the default setting

Reporting Supported Range of Parameter Values

Command: +ER=?

Response: +ER: (<value> range)

Example: +ER: (0,1)

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+ER: <type>

+ER: <type>

+ER: <type>+ER: <type>

The +ER: <type> reported represents the current (negotiated or renegotiated) modem-modem
error control type. If enabled, the intermediate result code is transmitted at the point during
error control negotiation (handshaking) at which the modem has determined which error
control protocol will be used (if any), before the final result code (e.g., CONNECT) is
transmitted.

The +ER intermediate result code, if enabled, is issued after the Modulation report (+MCR
and +MRR) and before the Data Compression Report (+DR).

Syntax

+ER: <type>

Defined Values

<type> An alphanumeric code corresponding to the selected protocol.

NONE Error control is not in use.

LAPM V.42 LAPM protocol is in use.

ALT MNP is in use.

Example

+ER: LAPM

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+ETBM - Call Termination Buffer Management

This extended-format compound parameter controls the handling of data remaining in modem
buffers upon call termination. It accepts three numeric subparameters:

Syntax

+ETBM=[<pending_TD>[,<pending_RD>[,<timer>]]]

Defined Values

<pending_TD> Decimal number 0 specifying that disconnect will occur

immediately and all buffered transmit data will be discarded when
the local DTE requests call disconnection.

<pending_RD> Decimal number 0 specifying that disconnect will occur

immediately and all buffered receive data will be discarded when
the local DTE requests call disconnection.

<timer> Decimal number 0 specifying that the modem will not attempt to

deliver the buffered data before abandoning the attempt and
discarding remaining data.

Reporting Current or Selected Values

Command: +ETBM?

Response: +ETBM: <pending_TD>,<pending_RD>,<timer>

Example: +ETBM: 0,0,0

Reporting Supported Range of Parameter Values

Command: +ETBM=?

Response: +ETBM: (<pending_TD> range),(<pending_RD> range), (<timer> range)

Example: +ETBM: (0),(0),(0)

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Data Compression Commands

This section contains parameters to condition modem use of standard ITU-T V.42bis Data
Compression Procedures.

+DS - Data Compression

This extended-format compound parameter controls the V.42bis data compression function if
provided in the modem. It accepts four numeric subparameters:

Syntax

+DS=[<direction>[,<compr_neg>[,<max_dict>[,<max_string>]]]]

Defined Values

<direction> Specifies the desired direction(s) of operation of the data

compression function; from the DTE point of view.

0 Negotiated; no compression (V.42bis P0=0).

3 both directions, accept any direction (V.42bis

P0=11). (Default.)

<compr_neg> Specifies whether or not the modem should continue to operate if

the desired result is not obtained.

0 Do not disconnect if V.42bis is not negotiated by the

remote modem as specified in <direction>.

<max_dict> Specifies the maximum number of dictionary entries (2048 entries)

which should be negotiated (may be used by the DTE to limit the
codeword size transmitted, based on its knowledge of the nature of
the data to be transmitted).

<max_string> Specifies the maximum string length (32 bytes) to be negotiated

(V.42bis P2).

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Reporting Current or Selected Values

Command: +DS?

Response: +DS: <direction>,<compr_neg>,<max_dict>,<max_string>

Example: +DS: 3,0,2048,32 for the defaults and 2048 entry max

dictionary.

Reporting Supported Range of Parameter Values

Command: +DS=?

Response: +DS: (<direction> range),(< compr_neg > range),(<max_dict>

range),(<max_string> range)

Example: +DS: (0,3),(0),(2048),(32)

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+DS44 - V.44 Compression Select

This extended-format compound parameter controls the V.44 data compression function.

Syntax

+DS44=[<direction>[,< compress_negotiation >[,<capability>[,<max_codewords_tx>
[,<max_codewords_rx>[,<max_string_tx>[,<max_string_rx>[,<max_history_tx>
[,<max_history_rx>]]]]]]]]]

Defined Values

<direction> Decimal number that specifies the desired direction(s) of

operation of the data compression function; from the DTE
point of view.

0 Negotiated, no compression.

1 Transmit only.

2 Receive only.

3 Both directions, accept any direction. (Default.)

<compress_negotiation> Decimal number that specifies whether or not the modem

should continue to operate if the desired result is not obtained.

0 Do not disconnect if V.44 is not negotiated by the

remote DCE as specified in <direction>. (Default.)

1 Disconnect if V.44 is not negotiated by the remote

DCE as specified in <direction>.

<capability> Decimal number that specifies the use of stream method,

packet method, multi-packet method.

0 Stream method. (Default.)

1 Packet method.

2 Multi-packet method.

<max_codewords_tx> Decimal number from 256 to 2048 that specifies the maximum

number of codewords which should be negotiated in the
transmit direction. (Default = 2048.)

<max_codewords_rx> Decimal number from 256 to 2048 that specifies the maximum

number of codewords which should be negotiated in the
receive direction. (Default = 2048.)

<max_string_tx> Decimal number from 32 to 255 that specifies the maximum

string length to be negotiated in the transmit direction.
(Default = 32.)

<max_string_rx> Decimal number from 32 to 255 that specifies the maximum

string length to be negotiated in the receive direction. (Default
= 32.)

<max_history_tx> Decimal number from 2048 to 4096 that specifies the

maximum size of the history buffer to be negotiated in the
transmit direction. (Default = 4096.)

<max_history_rx> Decimal number from 2048 to 4096 that specifies the

maximum size of the history buffer to be negotiated in the
receive direction. (Default = 4096.)

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Reporting Current or Selected Values

Command: +DS44?

Response: +DS44:<direction>,<compression_negotiation>,<capability>,

<max_codewords_tx>,<max_codewords_rx>,<max_string_tx>,
<max_string_rx>,<max_history_tx>,<max_history_rx>

Example: +DS44:3,0,0,2048,2048,32,32,4096,4096 For the default setting.

Reporting Supported Range of Parameter Values

Command: +DS44=?

Response: +DS44:(list of supported <direction> values),(list of supported

<compression_negotiation> values),(list of supported <capability> values),(list
of supported <max_codewords_tx> values),(list of supported
<max_codewords_rx> values),(list of supported <max_string_tx> values),(list
of supported <max_string_rx> values),(list of supported <max_history_tx>
values),(list of supported <max_history_rx> values)

+DR - Data Compression Reporting

This extended-format numeric parameter controls whether or not the extended-format "+DR:
" intermediate result code is transmitted from the modem to the DTE (see Section 3.5 and
Table 3-14).

S95 bit 5 is reset to 0 for +DR=0 and is set to a 1 for +DR=1. The more recent setting of +DR
or S95 bit 5, and the W command setting, determines the actual data compression result code
reporting (see S95 Parameter and W Command).

Syntax

+DR=[<value>]

Defined Values

<value> decimal number corresponding to the selected option:

0 Data compression reporting disabled (no +DR result

code transmitted).

1 Data compression reporting enabled (+DR result

code transmitted). (Default.)

Reporting Current or Selected Values

Command: +DR?

Response: +DR: <current value>

Example: +DR: 1 For the default setting.

Reporting Supported Range of Parameter Values

Command: +DR=?

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Response: +DR: (<value> range)

Example: +DR: (0,1)

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+DR: <type> Intermediate Result Code

The +DR: <type> reported represents the current (negotiated or renegotiated) modem-modem
data compression type. If enabled, the intermediate result code is transmitted at the point after
error control negotiation (handshaking) at which the modem has determined which data
compression technique will be used (if any) and the direction of operation. The +DR
intermediate result code, if enabled, is issued after the Error Control Report (+ER) and before
the final result code (e.g., CONNECT).

The format of this result code is:

Result Code Syntax

+DR: <type>

Defined Values

<type> An alphanumeric code corresponding to the selected option:

NONE Data compression is not in use.

V42B V.42bis is in use in both directions.

ALT MNP 5 compression.

Example

+DR: V42B

%C - Enable/Disable Data Compression

Enables or disables data compression negotiation. The modem can only perform data
compression on an error corrected link.

Syntax

%C[<value>]

Defined Values

<value> A decimal number corresponding to the selected option:

0 Disables data compression.

1 Enables both V.42 bis and MNP 5 data compression.

2 Enables both V.42 bis and MNP 5 data compression.

3 Enables both V.42 bis and MNP 5 data compression.

(Default.)

Result Codes

OK <value> = 0, 1, 2, or 3.

ERROR Otherwise.

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Commands Reference Manual

N - Automode Enable

This command is included for compatibility only and has no effect other than returning a
result code. The only valid values are 0-1.

Syntax

N[<mode>]

Defined Values

<mode > Decimal number corresponding to the selected value: 0-1.

Result Codes

OK <mode> = 0 to 1.

ERROR Otherwise.

V.8/V.8bis Commands

+A8E - V.8 and V.8bis Operation Controls

This command is defined for two conditions: as a parameter while the modem is on-hook,
and as an action command while the modem is off-hook. If enabled, V.8 negotiation does not
preclude simultaneous implementation of other negotiation means (e.g., V.8bis, V.18, V.32bis
Annex A).

This command is a compound parameter if issued while the modem is on-hook, used to
precondition V.8 and V.8bis originating and answering operation. It is issued by the DTE
before the Dial (D) or Answer (A) command, regardless of the state of the +FCLASS
parameter.

This command is an action command if issued while the modem is off-hook, to (re)start V.8
or V.8bis negotiation. For example, if initial V.8 negotiation failed, but subsequent T.30
negotiation indicated V.8 capability, this command may be used to initiate V.8 negotiation.

Syntax

+A8E=<v8o>,<v8a>,<v8cf>[,<v8b>][,<cfrange>][,<protrange>]

Defined Values

<v8o> Decimal number which enables/disables issuance of +A8x

indications during modem-controlled V.8 origination negotiation

1 Enable DCE-controlled V.8 origination negotiation

without +A8x indications. (Default.)

6 Enable DCE-controlled V.8 origination negotiation

with +A8x indications.

<v8a>= Decimal number which enables/disables issuance of +A8x

indications during modem-controlled V.8 answer negotiation.

1 Enable DCE-controlled V.8 answer negotiation

without +A8x indications. (Default.)

5 Enable DCE-controlled V.8 answer negotiation with

+A8x indications.

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<v8cf>= Set the V.8 CI signal call function to the hexadecimal octet value

X.

<v8b>= Decimal number which enables/disables V.8bis negotiation.

0 Disable V.8bis negotiation. (Default.)

1 Enable DCE-controlled V.8bis negotiation.

2 Enable DTE-controlled V.8bis negotiation.

<cfrange>= “<string of values>“. Applicable only for <v8a>=5 (not

supported).

< protrange >= “<string of values>“. Applicable only for <v8a>=5 (not

supported).

Default values: 1,1,,1,"",""

The ATD and ATA commands behave as specified in §6.3.1/V.25ter and §6.3.5/V.25ter,
respectively, and +A8n indications are not generated by the modem.

For subparameter values <v8o>=6 and <v8a>=5, the +A8I, +A8C, +A8A, +A8J, and +A8M
indications are issued during the course of the V.8 session to notify the DTE when the
relevant V.8 signals are received. The modem controls the V.8 session, however, and the
+A8M command is not used.

Reporting Current or Selected Values

Command: +A8E?

Response: +A8E: <v8o>,<v8a>,<v8cf>[,<v8b>][,<cfrange>][,<protrange>]

Example: +A8E: 1,1,,1,"","" For the defaults

Reporting Supported Range of Parameter Values

Command: +A8E=?

Response: +A8E: (<v8o> range),(<v8a> range), (maximum size of v8cf in octets), (<v8b>

range),(<cfrange> option bit
range),(<protrange> option bit range)

Example: +A8E: (1,6),(1,5),(1),(0),(1,6),(1)

+A8M - Send V.8 Menu Signals

This command, applicable only in DTE-controlled V.8, directs the modem to send a V.8 CM
or JM signal using the specified hexadecimal coded string. If the modem can decode the menu
octet string, and if it cannot implement a specified feature, the modem reports an ERROR
final result code, but stays in V.8 operation awaiting another command.

Syntax

+A8M=<hexadecimal coded CM or JM octet string>

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+A8I: - CI Signal Indication

This indication is issued by an answering modem, if +A8E,<v8a> ≠ 0, to indicate detection
of a V.8 CI signal, and report the recovered Call Function octet(s).

Indication Syntax

+A8I:<v8cf><CR>

Defined Values

<v8cf> A hexadecimal code octet representation of those Call Function

octet(s). +A8I:0 indicates that the modem timed out waiting for CI.

Example

+A8I:0 The modem timed out waiting for CI.

+A8I:X YYY

+A8C: - Calling Tone Indication

This indication is issued by an answering modem, if +A8E,<v8a> ≠ 0, to indicate detection of
1100 Hz or 1300 Hz calling tones, or sigC signals, as defined in T.30, V.8 and in V.25.

Indication Syntax

+A8C: <type><CR>

Defined Values

<type> Decimal number which indicates the corresponding detected

calling tone.

0 The modem concluded answer tone transmission

without reporting detection of any calling tone.

1 CNG tone (1100 Hz) detected.

2 1300 Hz V.25 data modem calling tone detected.

3 sigC signal: V.32/V.32bis AA tone detected.

Example

+A8C: 1 For CNG tone detected.

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+A8A: - Answer Signal Indication

This indication is issued by a calling modem, if +A8E <v8o> ≠ 0, to indicate detection of an
answering signal.

Indication Syntax

+A8A:<type><CR>

Defined Values

<type><CR> Decimal number which indicates the corresponding detected

answer signal.

0 The modem timed out waiting for an answering

signal.

1 V.8 ANSam signal (2100 Hz with amplitude

modulation) detected.

2 V.25 answer tone (2100 Hz) detected.

3 V.25 answer tone with phase reversals detected.

(Note)

4 sigA signal: V.21 Ch2 with flags (e.g., T.30 control

preamble) detected.

5 sigA signal: V.22bis USB1 signal detected.

6 sigA signal: V.32bis AC signal detected.

7 sigA signal: V.34 ToneA signal detected.

Example

+A8A:1 For V.8 ANSam signal (2100 Hz with amplitude modulation)

detected.

+A8J: - V.8 Negotiation Complete

This indication is issued by either modem when the negotiation is complete and CJ is sent or
detected. An answering modem will issue this on detection of CJ from the remote terminal. A
calling modem will send a CJ signal to the remote terminal at the same time as a +A8J
indication. +A8J:1 indicates CJ; +A8J:0 indicates that the modem timed out waiting for a CJ
signal.

Indication Syntax

+A8J:<value><CR>

Defined Values

<value> Decimal number corresponding to the selected option.

0 The modem timed out waiting for a CJ signal.

1 CJ signal sent or detected.

Example

+A8J:1 For CJ sent to a remote terminal.

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+A8M: - V.8 Menu Report

This indication is issued by either modem, during V.8 negotiation, to indicate the contents of
a valid received CM or JM signal. A +A8M:0 indicates that the modem timed out waiting for
a CM or JM signal.

Report Syntax

+A8M:< hex_string>

Defined Values

< hex_string> CM or JM hexadecimal coded string. A +A8M:0 indicates that the

modem timed out waiting for a CM or JM signal.

Example

A8M:XXX YYY

+A8R: - V.8bis Signal and Message Reporting

If enabled by +A8E=,,,[<v8b>=2] command, the modem monitors for V.8bis signals and
messages, and uses the +A8R: intermediate result code response to report that signal. Two
concatenated V.8bis messages are reported with two consecutive <message> indications.

Report Syntax

+A8R:<signal>[,[<1st message>]][,<2nd message>]<CR>

Defined Values

<signal> The V.8bis signal, if detected, is indicated using a <signal> value

(see Table 3-3). Values of 4 and 8 are not reported, i.e., the modem
is not expected to discern the power level of received CRe and
MRd signals. If a V.8bis message is detected without a preceding
V.8bis signal, the preamble is reported as a 0 <signal> value.

<1st message> The contents of valid V.8bis message(s), if detected, are reported

using hexadecimal octet coded string(s) (A.4.1). Flag detection and
consumption, flag transparency 0-bit deletion and FCS checking
are performed by the modem. The modem does not report invalid
messages (e.g., bad FCS). If two consecutive messages are
detected but the first is invalid, the modem indicates this with no
characters between the first and second comma (e.g.,
+A8R:<signal>,,<2nd message>).

<2nd message See <1st message>.

Example

+A8R:0,XX,YY For a V.8bis message detected without a preceding V.8bis signal.

+A8R:0,XX,YY For a V.8bis message detected with a preceding V.8bis signal.

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Table 3-3. V.8/V.8bis Example Commands/Responses for Originator and Answerer

Originator Answerer

Scenario DTE Command Modem Response or Indication DTE Command Modem Answerer Response or Indication

1 AT&FS0=1<cr> AT&FS0=1<cr><cr><lf>OK<cr><lf> AT&FS0=1<cr> AT&FS0=1<cr><cr><lf>OK<cr><lf>

ATDT102<cr> ATDT102<cr> <cr><lf>RING<cr><lf>

<cr><lf>CONNECT 57600<cr><lf> <cr><lf>CONNECT 57600<cr><lf>

2 AT&FS0=1<cr> AT&FS0=1<cr><cr><lf>OK<cr><lf AT&FS0=1<cr> AT&FS0=1<cr><cr><lf>OK<cr><lf>

AT+A8E=6,5<cr> AT+A8E=6,5<cr><cr><lf>OK<cr><lf>

ATDT102<cr> ATDT102<cr> <cr><lf>RING<cr><lf>

<cr><lf>CONNECT 57600<cr><lf> <cr><lf>+A8I: 0<cr><lf>

<cr><lf>+A8M: C145<cr><lf>

<cr><lf>+A8J: 1<cr><lf>

<cr><lf>CONNECT 57600<cr><lf>

3 AT&FS0=1<cr> AT&FS0=1<cr> AT&FS0=1<cr> AT&FS0=1<cr><cr><lf>OK<cr><lf>

AT+A8E=6,5<cr> AT+A8E=6,5<cr><cr><lf>OK<cr><lf>

ATDT102<cr> ATDT102<cr> <cr><lf>RING<cr><lf>

<cr><lf>+A8A: 1<cr><lf>

<cr><lf>+A8M: C145<cr><lf>

<cr><lf>+A8J: 1<cr><lf>

<cr><lf>CONNECT 57600<cr><lf> <cr><lf>CONNECT 57600<cr><lf>

4 AT&FS0=1<cr> AT&FS0=1<cr> AT&FS0=1<cr> AT&FS0=1<cr>

AT+A8E=6,5<cr> AT+A8E=6,5<cr><cr><lf>OK<cr><lf> AT+A8E=6,5<cr> AT+A8E=6,5<cr><cr><lf>OK<cr><lf>

ATDT102<cr> ATDT102<cr> <cr><lf>RING<cr><lf>

<cr><lf>+A8A: 1<cr><lf> <cr><lf>+A8I: C1<cr><lf>

<cr><lf>+A8M: C145<cr><lf> <cr><lf>+A8M: C145<cr><lf>

<cr><lf>+A8J: 1<cr><lf> <cr><lf>+A8J: 1<cr><lf>

<cr><lf>CONNECT 57600<cr><lf> <cr><lf>CONNECT 57600<cr><lf>

5 AT&FS0=1<cr> AT&FS0=1<cr> AT&FS0=1<cr> AT&FS0=1<cr>

AT+A8E=6,5,21<cr> AT+A8E=6,5,21<cr><cr><lf>OK<cr><lf> AT+A8E=6,5<cr> AT+A8E=6,5<cr><cr><lf>OK<cr><lf>

ATDT102<cr> ATDT102<cr> <cr><lf>RING<cr><lf>

<cr><lf>+A8A: 1<cr><lf> <cr><lf>+A8I: 21<cr><lf>

<cr><lf>+A8M: C1000000<cr><lf> <cr><lf>+A8M: 2145<cr><lf>

<cr><lf>+A8J: 1<cr><lf> <cr><lf>+A8J: 0<cr><lf>

<cr><lf>NO CARRIER<cr><lf> <cr><lf>NO CARRIER<cr><lf>

6 AT&FS0=1<cr> AT&FS0=1<cr> AT&FS0=1<cr> AT&FS0=1<cr>

AT+A8E=6,5,21<cr> AT+A8E=6,5,21<cr><cr><lf>OK<cr><lf> AT+A8E=6,5,21<cr> AT+A8E=6,5,21<cr><cr><lf>OK<cr><lf>

ATDT102<cr> ATDT102<cr> <cr><lf>RING<cr><lf>

<cr><lf>+A8A: 1<cr><lf> <cr><lf>+A8I: 21<cr><lf>

<cr><lf>+A8M: 2145<cr><lf> <cr><lf>+A8M: 2145<cr><lf>

<cr><lf>+A8J: 1<cr><lf> <cr><lf>+A8J: 1<cr><lf>

<cr><lf>CONNECT 57600<cr><lf> <cr><lf>CONNECT 57600<cr><lf>

7 AT&FS0=1<cr> AT&FS0=1<cr> AT&FS0=1<cr> AT&FS0=1<cr>

AT+A8E=6,5,21<cr> AT+A8E=6,5,21<cr><cr><lf>OK<cr><lf> AT+A8E=6,5,,,"1"<cr> AT+A8E=6,5,,,"1"<cr><cr><lf>OK<cr><lf>

ATDT102<cr> ATDT102<cr> <cr><lf>RING<cr><lf>

<cr><lf>+A8A: 1<cr><lf> <cr><lf>+A8I: 21<cr><lf>

<cr><lf>+A8M: 2145<cr><lf> <cr><lf>+A8M: 2145<cr><lf>

<cr><lf>+A8J: 1<cr><lf> <cr><lf>+A8J: 1<cr><lf>

<cr><lf>CONNECT 57600<cr><lf> <cr><lf>CONNECT 57600<cr><lf>

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Table 3-3. V.8/V.8bis Example Commands/Responses for Originator and Answerer (Continued)

Originator Answerer

Scenario DTE Command Modem Response or Indication DTE Command Modem Answerer Response or Indication

8 Originating Modem that Sends a Protocol Octet that

indicates LAPM

9 Originating Modem that Sends a Protocol Octet that

indicates LAPM

AT&FS0=1<cr> AT&FS0=1<cr>

AT+A8E=6,5<cr> AT+A8E=6,5<cr><cr><lf>OK<cr><lf>

<cr><lf>RING<cr><lf>

<cr><lf>+A8I: C1<cr><lf>

<cr><lf>+A8M: C145000026<cr><lf>

<cr><lf>+A8J: 1<cr><lf>

<cr><lf>NO CARRIER<cr><lf>

AT&FS0=1<cr> AT&FS0=1<cr>

AT+A8E=6,5,,,,"1"<cr> AT+A8E=6,5,,,,"1"<cr><cr><lf>OK<cr><lf>

<cr><lf>RING<cr><lf>

<cr><lf>+A8I: C1<cr><lf>

<cr><lf>+A8M: C145000026<cr><lf>

<cr><lf>+A8J: 1<cr><lf>

<cr><lf>CONNECT 57600<cr><lf>

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Synchronous Access Mode Commands

+ESA - Configure Synchronous Access Mode

This extended-format compound parameter controls the manner of operation of the
Synchronous Access Mode in the modem.

Enabling Synchronous Access Mode enables the use of the 8-bit command characters defined
in Table 9/V.80 of the Draft ITU-T Recommendation V.80 (DATA COMMUNICATION
OVER THE TELEPHONE NETWORK; In-Band modem Control and Synchronous Data
Modes for Asynchronous DTE).

Syntax

+ESA=[<trans_idle>[,<framed_idle>[,<framed_un_ov>[,<hd_auto>[,<crc_type>
[,<nrzi_en>[,<syn1>[,<syn2>]]]]]]]]

Defined Values

<trans_idle> Decimal number which specifies the bit sequence transmitted by

the modem when a transmit data buffer underrun condition occurs,
while operating in Transparent sub-Mode. The options are:

0 In Transparent sub-Mode, modem transmits 8-bit

SYN sequence on idle. Modem receiver does not
hunt for synchronization sequence (default and
fixed).

<framed_idle> Decimal number which specifies the bit sequence transmitted by

the modem when a transmit data buffer underrun condition occurs
immediately after a flag, while operating in Framed sub-Mode.
The options are:

0 In Framed sub-Mode, modem transmits HDLC flags

on idle (default and fixed).

<framed_un_ov> Decimal number which specifies the actions undertaken by the

modem when a transmit data buffer underrun or overrun condition
occurs immediately after a non-flag octet, while operating in
Framed sub-Mode.

0 In Framed sub-Mode, modem transmits abort on

underrun in middle of frame. (Default.)

1 In Framed sub-Mode, modem transmits a flag on

underrun in middle of frame, and notifies DTE of
underrun or overrun.

<hd_auto> Decimal number which specifies whether or not, in V.34 half-

duplex operation, additional procedures besides those specified in

§ 12/V.34 will be performed by the modem when switching from
primary channel to secondary channel operation, and vice versa.
This subparameter should not be commanded.

<crc_type> Decimal number which specifies the CRC polynomial used while

operating in Framed sub-Mode. The options are:

0 CRC generation and checking disabled. (Default and

fixed.)

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<nrzi_en> Decimal number which specifies if Non Return to Zero Inverted

(NRZI) encoding is to be used by the modem for transmit and
receive data. The options are:

0 NZRI encoding and decoding disabled (default and

fixed).

<syn1>, <syn2> Decimal number which specifies the octet value(s) to be used

while performing character-oriented framing. <syn1> is to be
commanded to 255 (FFh); <syn2> is not to be commanded.

Reporting Current or Selected Values

Command: +ESA?

Response: +ESA:

<trans_idle>,<framed_idle>,<framed_un_ov
>,<hd_auto>,<crc_type>,<nrzi_en>,<syn1>,
<syn2>

Example: +ESA: 0,0,0,,0,0,255, For the defaults.

Reporting Supported Range of Parameter Values

Command: +ESA=?

Response: +ESA: (<trans_idle> range), (<framed_idle> range),(<framed_un_ov> range),

(<hd_auto> range),
(<crc_type> range), (<nrzi_en>
range),(<syn1> range), (<syn2> range)

Example: +ESA: (0),(0),(0-1), ,(0),(0),(255)

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+ITF - Transmit Flow Control Thresholds

In V.80 Synchronous Access Mode, this optional compound parameter allows the DTE to
determine the effective input buffer size in the modem for data on transmit data from the
DTE, to control the thresholds used for flow control of such data, and to control how often the
modem reports to the DTE the number of octets in this buffer. Note that the DTE can adjust
its own thresholds for flow control of data on received data from the modem.

Syntax

+ITF=[<off>[,<on>[,<report_period>]]]

Defined Values

<off> Determines the threshold, in octets, above which the modem will

generate a flow off signal. Applicable in Synchronous Access
Mode.

The <off> range is 20 -7000. Default <off> value is 128.

For the <on> and <off> subparameters, the input buffer is assumed
to reside between the modem’s V.24 interface and the
Synchronous Access protocol layer; i.e., the buffer count includes
all octets, including EM codes, received from the DTE, with the
exception of XON and XOFF if these are used to signal <modem­by-DTE> flow control.

The modem returns the ERROR result code if the DTE specifies
that the <off> subparameter be set to a value less than or equal to
the <on> subparameter; in this case, the current parameter value
settings are set to default values.

<on> Determines the threshold, in octets, below which the modem will

generate a flow on signal. Applicable in Synchronous Access
Mode.

The <on> range is 10 -5000. Default <on> value is 64.

<report_period> Not supported. A fixed value of zero is used and reported.

3-58

Reporting Current or Selected Values

Command: +ITF?

Response: +ITF: <off>,<on>,<report_period>

Example: +ITF: 128,64,0 For default values

Reporting Supported Range of Parameter Values

Command: +ITF=?

Response: +ITF: (<off> range),(<on> range),(<report_period> range)

Example: +ITF: (20-7000),(10-5000),(0)

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Diagnostic and Test Commands

#UD – Last Call Status Report

#UD is an action command requesting reporting of logged operation events. It does not take
parameters and must be the last command in the command line.

The modem logs aspects of their operation for each call, and saves these results until cleared
by one of the following events:

1. Power off

2. Hard reset (e.g., negate DTR with &D3 set; reset button)

3. Soft reset = ATZ or AT&F

4. ATD command issued

5. ATA command issued

6. Automatic answer (e.g., set register S0>0 and ring detected)

These results are NOT cleared by changing DTR, V.24 circuit 108.2, if &D0, &D1 or &D2.

Data Call State Model

For purposes of this command, there are four data call states, and associated status issues:

• Call Setup

− Calling DCE: get dial tone, generate dial digits, detect call progress signals.

− Answering DCE: detect ringing, detect CallerID, etc.

• Negotiation

− V.25 calling tone/answer tone exchanges

− V.8 or V.8bis call function negotiations

− V-series modem carrier detection and training

− Modem-to-modem protocols (e.g., V.42, V.42bis).

• Data Transfer

− Bit-error rates, for each direction

− Rate renegotiation

− Retraining

• Call Termination

− protocol disconnect signals

− carrier disconnect signals

− loss of carrier

− excessive error rates

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Command Syntax

In response to this command, the modem will report one or more lines of information text as
defined below. Information text format conforms to V.250; each line is preceded by a
<CR><LF> pair, and terminated by <CR><LF>. (CR and LF characters may be changed by
writing new values to the contents of registers S3 and S4, respectively.)

The modem may generate a single line or multiple lines, followed by a standard OK final
result code. For example, if call setup failed, only that result is useful. Each information text
line is formatted as follows, including one or more key=value pairs:

Syntax

#UD

Response

DIAG <token key=value [[key=value] [key=value]] …>

Defined Values

DIAG 5 hexadecimal characters (44h, 49h, 41h, 47h, 20h)

< Left angle bracket (less than sign) (3Ch)

token Unique 32-bit hexadecimal string 2A4D3263(32h, 4h1, 34h, 44h,

33h, 32h, 36h, 33h)

space space character (20h)

Key One- or two-digit hexadecimal number (see Key in Table 3-3)

= Equal sign (3Dh)

Value Any string as defined below (Table 3-3 - as Table 3-8 appropriate)

> Right angle bracket (greater than sign) (3Eh)

Unless otherwise noted, all values are hexadecimal numbers. Any numeric values from tables
in ITU V.58 are converted to hexadecimal. Multi-digit values are reported MSD first. Leading
0’s may be deleted. See examples in Table 3-12.

3-60

Monitoring an active connection

This command is intended for use after call termination. However, codes are defined so that a
modem can respond before the first call is placed, and during a call for live monitoring
purposes. For example, key 60, call termination, has value 1 defined, indicating that the call is
still in progress.

There are at least two ways to do this. First, the DTE could switch the modem to On-Line
command state, issue the command, capture the responses and then issue an ATO command.
For smoother on-line monitoring, in-band means defined in ITU V.80 are recommended if
available in the modem. If V.80 methods are used, each response line shall be a separate
extended in-band message.

Notes for Tables

1. The modem may insert a delay (e.g., 10 ms) between information text lines.

2. The code tables include values for data and fax calls. Some of the codes are applicable

only to data calls (e.g., data compression), some are applicable only to call origination
(e.g., busy, answering signal detection) and some are applicable only to the answering
modem (e.g., calling signal detection).

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Commands Reference Manual

callCleared codes from 3.6.4/V.58-1994

callCleared: indicates that the DCE has gone on hook and that the previously existing network
connection has been cleared. These value are hex, converted from decimal in V.58.
callCleared codes are described in Table 3-11.

Table 3-4. AT#UD Last Call Status Report Format

Key Value(s) Definition

0 2 digits Diagnostic Command Specification revision number, digit.digit
1 Table 3-4 Call Setup Result code
2 Table 3-5 Multi-media mode
3 Table 3-7 DTE-DCE interface mode
4 String V.8 CM octet string, same format as V.250, in quotes
5 String V.8 JM octet string, same format as V.250, in quotes
10 0-2F Received signal power level, in –dBm (0-43)
11 0-1F Transmit signal power level, in –dBm (e.g., 0-17)
12 0-64 Estimated noise level, in –dBm (e.g., 10-90)
17 0-FFF Round Trip delay, in units of ms
18 Table 3-7 V.34 INFO bit map
20 Table 3-8 Transmit Carrier Negotiation Result
21 Table 3-8 Receive Carrier Negotiation Result
22 0-1F40 Transmit Carrier symbol rate (0-8000) in symbol/s
23 0-1F40 Receive Carrier symbol rate (0-8000) in symbol/s
24 0-FA0 Transmit Carrier frequency (0-4000) in Hz
25 0-FA0 Receive Carrier frequency (0-4000) in Hz
26 0-FA00 Initial transmit carrier data rate (0-64000) in bit/s
27 0-FA00 Initial receive carrier data rate (0-64000) in bit/s
30 0-FF Temporary carrier loss event count
31 0-FF Carrier Rate re-negotiation event count
32 0-FF Carrier Retrains requested
33 0-FF Carrier Retrain requests granted
34 0-FA00 Final transmit carrier data rate in bit/s
35 0-FA00 Final receive carrier data rate in bit/s
40 Table 3-9 Protocol Negotiation Result
41 0-400 Error Control frame size in bytes
42 0-FF Error control link timeouts in transmission
43 0-FF Error control link NAKs received
44 Table 3-10 Compression Negotiation Result
50 0-2 Transmit flow control: 0 = off; 1 = DC1/DC3; 2 = V.24 circuit

51 0-2 Receive flow control: 0 = off; 1 = DC1/DC3; 2 = V.24 circuit

52 0-FFFFFFFF Transmit characters sent from DTE
53 0-FFFFFFFF Received characters sent to DTE
54 0-FFFF Transmit characters lost (data overrun errors from DTE)
55 0-FFFF Received characters lost (data overrun errors to DTE)
56 0-FFFFFFFF Transmit I- Frame count, if error control protocol running
57 0-FFFFFFFF Received I-Frame count, if error control protocol running
58 0-FFFF Transmit I-Frame error count, if error control protocol running
59 0-FFFF Received I- Frame error count, if error control protocol running
60 Table 3-11 Termination Cause
61 0-FF Call Waiting event count

106/133

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Table 3-5. Call Setup Result Codes

Code Definition

0 No previous call (modem log has been cleared since any previous calls)

1 No dial tone detected
2 Reorder signal detected, network busy

3 Busy signal detected
4 No recognized signal detected (e.g., no signal, or nothing recognizable)

5 Voice detected * if this is a voice modem (e.g., V.253) operating in voice mode (e.g.,

7 Data Answering signal detected (e.g., V.25 ANS, V.8 ANSam)

8 Data Calling signal detected (e.g., V.25 CT, V.8 CI)
9 Fax Answering signal detected (e.g., T.30 CED, DIS)

A Fax Calling signal detected (e.g., T.30 CNG)
B V.8bis signal detected

+FCLASS=8.0)

Table 3-6. Multimedia Modes

Code Definition

0 Data Only
1Fax Only

2Voice
9 Video-telephony, H.324

A Other V.80 call

Table 3-7. DTE-DCE modes

Code Definition

0 Async data

1 V.80 transparent synchronous mode
2 V.80 framed synchronous mode

Table 3-8. V.34 INFO bit report

Bits Source bits Definition

31-30 INFO0 bit 20; 0
20-29 INFOc bits 79-88

16-19

12-15 INFOa bits 26-29
10-11 MP bit 50; 0

0-9 INFOa bits 40-49

INFOc bits 26-29 or 35-38 or 44-47 or 53-56­or 62-65 or 71-74

Pre-emphasis field, selected by the
symbol rate chosen

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Table 3-9. gstnModulationSchemeActive from 3.7.2/V.58

Value Description

0 V.17 (G3 Fax call)

1V.21
2V.22

3 V.22bis
4 V.23 Constant Carrier (1200/75)

8 V.27ter (G3 Fax call)
9 V.29 HD (G3 Fax call)

AV.32
B V.32bis

CV.34
EV.90

81

84 Bell 212A

85 Bell 103

K56flex



Table 3-10. errorControl Active from 3.5.2/V.58

Value Description

0 Disable/none

1 V.42 LAPM
2 V.42 Alternative protocol (MNP™)

80 MNP10™

Table 3-11. compressionActive from 3.2.2/V.58

Value Description

0 None
1 V.42bis

80 MNP5™

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Table 3-12. callCleared codes from 3.6.4/V.58-1994

Value Description Notes

0 CauseUnidentified Call setup issues

1 No Previous call Not in V.58
2 Call is still in progress Not in V.58

3 Call Waiting signal detected Not in V.58, only if modem can detect it
4 Delayed Same as value 2A,

19 InactivityTimerExpired
1F cct108isOffInhibitsDial DTR low

20 cct108turnedOff DTR drop
29 BlacklistedNumber

2A CallAttemptsLimitExceeded Same as “Delayed”, see ETS 300 001
2B ExtensionPhoneOffHook If extension detection supported

2C CallSetupFailTimerExpired e.g., S7 timeout
2D IncomingCallDetected If incoming call while sending dial

2E LoopCurrentInterrupted

2F NoDialTone
31 ReorderTone Fast busy

33 EngagedTone Busy
34 LongSpaceDisconnect And if modem program to abort on long

3C CarrierLost Signal Converter

3D TrainingFailed
3E NoModulationinCommon

3F RetrainFailed
40 RetrainAttemptCountExceeded

41 GstnCleardownReceived
42 FaxDetected If this was not a fax call attempt

46 InTestMode Test
50 AnyKeyAbort Call Control

51 DteHangupCommand

52 DteResetCommand If ATZ was used to terminate the previous

5A FrameReject Error Control

5B NoErrorControlEstablished Error control was required
5C ProtocolViolation

5D n400exceeded LAPM retransmission Count Timer
5E NegotiationFailed

5F DisconnectFrameReceived
60 SabmeFrameReceived

64 LossOfSynchronization Data Compression

CallAttemptsLimitExceeded

command.

space

If ATH was used to terminate the previous
call.

call.

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Example Modem Response and Usage

Example #UD commend response are shown in Table 3-13.

Table 3-13. Completed Data Call, with Some Errors and Rate Retrain during the Call

Modem Response line Description

DIAG <2A4D3263 0=09> This is version 0.9

DIAG <2A4D3263 1=06 2=0 3=0> Data Answer signal detected; Data only;

DIAG <2A4D3263 5=”C14513902A”
6=”A145”>

DIAG <2A4D3263 10=1F 11=0C 12=52> Receive level = -31 dBm; transmit level = -12

DIAG <2A4D3263 14=03 15=05 16=10> Far end echo delay in milliseconds; Far end

DIAG <2A4D3263 20=C 22=780 24=0C80
26=79E0>

DIAG <2A4D3263 21=D 25=1F40 27=DAC0> Receiver: V.90 training completed; V.90 symbol

DIAG <2A4D3263 30=00 31=03 32=01
33=01>

DIAG <2A4D3263 34=7080 35=CB20> Final transmit rate is 28800 bit/s; final receive

DIAG <2A4D3263 40=1 41=100> LAPM negotiation completed; frame size = 256

DIAG <2A4D3263 42=0 43=0> No error control timeout or link NAKs
DIAG <2A4D3263 44=1 45=400> V.42bis data compression used; dictionary size

DIAG <2A4D3263 50=2 51=2> Hardware transmit and receive flow control

DIAG <2A4D3263 52=343CC 54=0>

DIAG <2A4D3263 53=7230E6 55=47> 7483622 DTE characters received, 71

DIAG <2A4D3263 56=29D 58=0001> 597 (decimal) frames transmitted, with 1 frame

DIAG <2A4D3263 58=2A4B 59=0004> 10827 (decimal) frames received, with 4 frame

DIAG <2A4D3263 60=51> Local PC initiated hangup

Character async
V.8 Call Menu indicates:
V.8 Joint Menu selects:

dBm; noise level = -82 dBm

echo loss in dB; Near end echo loss = 16 dB
Transmitter: V.34 training completed; V.34

carrier frequency = 1920; V.34 symbol rate =
3200; initial transmit rate is 31200 bit/s

rate = 8000; initial receive rate is 56000 bit/s
No carrier loss events, 3 carrier rate

renegotiations attempted; 1 carrier retrain
requested; 1 carrier retrain granted

rate is 52000 bit/s

= 1024

213964 DTE characters transmitted, w/o
underrun

characters lost due to receive data overrun

error

errors

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%TT - PTT Test Command

This command facilitates PTT testing of signal levels by providing continuous signals regards
of whether or not the modem is connected to the line. The signal transmitted is in accordance
with the parameter provided.

A range of commands allows the user to initiate a series of signals required to obtain PTT
approval. The signals emitted include answer tone, modulation, carriers, and other pertinent
signals. A test is initiated upon receipt of a %TTn (the second T is a password and n is a test
number), and the test is aborted when any keyboard character is entered. The modem will
continuously transmit the tone or carrier according to the parameter supplied.

Syntax

%TT0x x corresponds to the desired DTMF dial digit (0, 1, 2, 3, 4, 5, 6, 7,

8, 9, *, #, A, B, C, or D).

0 Dial digit 0

1 Dial digit 1

2 Dial digit 2

3 Dial digit 3

4 Dial digit 4

5 Dial digit 5

6 Dial digit 6

7 Dial digit 7

8 Dial digit 8

9 Dial digit 9

A Dial digit *

B Dial digit #

C Dial digit A

D Dial digit B

E Dial digit C

F Dial digit D

%TT1x x corresponds to the desired FSK mode (V21Ch1, V21Ch2,

V23Ch1, V23Ch2, Bell103Ch1, or Bell103Ch2).

0 V21Ch1

1 V21Ch2

2 V23Ch1

3 V23Ch2

4 Bell103Ch1

5 Bell103Ch2

6-F Reserved

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%TT2x x corresponds to the desired QAM mode (V22Org, V22Ans,

Bell212Org, Bell212Ans, V22BisOrg, V22BisAns, V32@4800,
V32@7200, V32@9600, V.32Bis@12000, or V32Bis@14400).

0 V22Org

1 V22Ans

2 Bell212Org

3 Bell212Ans

4 V22BisOrg

5 V22BisAns

6 V32@4800

7 V32@7200

8 V32@9600

9 V.32Bis@12000

A V32Bis@14400

B-F Reserved

%TT3x x corresponds to the selected MISC function (Silence, 2100Hz,

1300Hz, or 1100Hz).

0 Silence

1 2100Hz

2 Reserved

3 1300Hz

4 1100Hz

5 5-F Reserved

%TT4x x corresponds to the selected FAX mode (V27@2400, V27@4800,

V29@7200, V29@9600, V17@7200LT, V17@7200ST,
V17@9600LT,V17@9600ST, V17@12000LT, V17@12000ST,
V17@14400LT, or V17@14400ST).

0 Reserved

1 V27@2400

2 V27@4800

3 V29@7200

4 V29@9600

5 V17@7200LT

6 V17@7200ST

7 V17@9600LT

8 V17@9600ST

9 V17@12000LT

A V17@12000ST

B V17@14400LT

C V17@14400ST

D-F Reserved

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%TT5xyz x corresponds to the desired V.34 bit rate (2400, 4800, 7200, 9600,

12000, 14400, 16800, 19200, 21600, 24000, 26400, 28800, 31200,
or 33600):

0 2400

1 4800

2 7200

3 9600

4 12000

5 14400

6 16800

7 19200

8 21600

9 24000

A 26400

B 28800

C 31200

D 33600

E-F Reserved

y corresponds to the desired V.34 symbol rate (2400, 2800, 3000,
3200, or 3429).

0 2400 (x ≤ 21600)

1 Reserved

2 2800 (x ≤ 26400)

3 3000 (x ≤ 28800)

4 3200 (x ≤ 31200)

5 3429 (x ≤ 33600)

6-F Reserved

z = Pre-Emphasis Filter 0...A

0 Pre-Emphasis Filter 0

1 Pre-Emphasis Filter 1

2 Pre-Emphasis Filter 2

3 Pre-Emphasis Filter 3

4 Pre-Emphasis Filter 4

5 Pre-Emphasis Filter 5

6 Pre-Emphasis Filter 6

7 Pre-Emphasis Filter 7

8 Pre-Emphasis Filter 8

9 Pre-Emphasis Filter 9

A Pre-Emphasis Filter A

B-F Reserved

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3.2.10

V.92 +P and –Q Commands

This section describes the +P (PCM DCE) and –Q commands and parameters used to control
the V.92 Mode operation.

+PCW - Call Waiting Enable

This command controls the operation of the modem in the presence of call waiting.

Syntax

+PCW=<value>

Defined Values

<value> Decimal number corresponding to the selected operation.

0 Request modem-on-hold if enabled by +PMH and

collect caller ID information if enabled by +VRID.
Toggle V.24 circuit 125. (Default.)

1 Hang-up.

2 Ignore call waiting.

Result Codes

OK <value> = 0, 1, or 2.

ERROR Otherwise.

Reporting Selected Value(s)

Command: +PCW?

Response: +PCW: <value>

Example: +PCW: 0 For the default setting.

Reporting Supported Range of Parameter Values

Command: +PCW=?

Response: +PCW: (<value> range)

Example: +PCW: (0,1,2)

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+PMH - Modem-on-Hold Enable

This command controls the selection of modem-on-hold in the modem. The action of the
modem in response to modem-on-hold events is determined by the state of this command as
well as the state of a negotiated handshake with a V.92-compliant server in V.92 Mode.

Syntax

+PMH=<value>

Defined Values

<value> Decimal number corresponding to the selected operation.

0 Modem-on-hold enabled in V.92 Mode. (Default.)

1 Disabled modem-on-hold.

Result Codes

OK 0 or 1 in V.92 Mode (see the +MS command)

ERROR Otherwise.

Reporting Current or Selected Value

Command: +PMH?

Response: +PMH: <current value>

Example: +PMH: 0 For the default setting.

Reporting Supported Range of Parameter Values

Command: +PMH=?

Response: +PMH: (<value> range)

Example: +PMH: (0,1)

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+PMHT – Modem-on-Hold Timer

This command controls whether or not the modem will grant or deny a modem-on-hold
(MOH) request as well as setting the MOH Timeout value.

Syntax

+PMHT=<value>

Defined Values

<value> Decimal number corresponding to selected setting.

0 Deny V.92 modem-on-hold Request (Default.)

1 Grant MOH with 10 second timeout

2 Grant MOH with 20 second timeout

3 Grant MOH with 30 second timeout

4 Grant MOH with 40 second timeout

5 Grant MOH with 1 minute timeout

6 Grant MOH with 2 minute timeout

7 Grant MOH with 3 minute timeout

8 Grant MOH with 4 minute timeout

9 Grant MOH with 6 minute timeout

10 Grant MOH with 8 minute timeout

11 Grant MOH with 12 minute timeout

12 Grant MOH with 16 minute timeout

13 Grant MOH with indefinite timeout

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Result Codes

OK 0-13 in V.92 Mode (+MS=V92)

ERROR Otherwise

Reporting Current or Selected Values

Command: +PMHT?

Response: +PMHT: <value>

Example: +PMHT: 0 For the default setting.

Reporting Supported Range of Parameter Values

Command: +PMHT=?

Response: +PMHT: (<value> range)

Example: +PMHT: (0,1,2,3,4,5,6,7,8,9,10,11,12,13)

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+PMHR - Initiate Modem-on-Hold

This command requests the modem to initiate or to confirm a modem-on-hold procedure. The
modem will return ERROR if modem-on-hold is not enabled or if the modem is in an idle
condition. The modem will return the string response +PMHR: <value> where <value> is a
decimal value corresponding to the status of the modem's hold exchange procedure as defined
below. This response may be delayed depending upon the context under which the +PMHR
command is made, i.e., if the +PMHR is in response to an incoming modem-on-hold or if it is
initiating a request.

Note: If modem-on-hold is enabled but the remote server does not support V.92 then the
modem will always report 0 to show that the hold request is denied.

Syntax

+PMHR

Response

+PMHR:<value>

<value> Decimal number corresponding to the maximum hold time the

server or hold-granting modem will allow.

0 V.92 MOH request denied or not available.

1 MOH with 10 second timeout Granted.

2 MOH with 20 second timeout Granted.

3 MOH with 30 second timeout Granted.

4 MOH with 40 second timeout Granted.

5 MOH with 1 minute timeout Granted.

6 MOH with 2 minute timeout Granted.

7 MOH with 3 minute timeout Granted.

8 MOH with 4 minute timeout Granted

9 MOH with 6 minute timeout Granted.

10 MOH with 8 minute timeout Granted.

11 MOH with 12 minute timeout Granted.

12 MOH with 16 minute timeout Granted.

13 MOH with indefinite timeout Granted.

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Result Codes

OK 0-13 in V.92 Mode (+MS=V92)

ERROR Otherwise

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+PIG - PCM Upstream Ignore

This command controls the selection of PCM upstream in the modem. The actual state of
PCM upstream is determined by the state of this command as well as the state of a negotiated
handshake with a V.92-compliant server in V.92 Mode.

Note: This command is not applicable to HCF products.

Syntax

+PIG=<value>

Defined Values

<value> Decimal number corresponding to the selected operation.

0 Enable PCM upstream negotiation.

1 Disable PCM upstream negotiation. (Default.)

Result Codes

OK 0 or 1 in V.92 Mode (+MS=V.92)

ERROR Otherwise

Reporting Selected Value(s)

Command: +PIG?

Response: +PIG: <value>

Example: +PIG: 1 For the default setting.

Reporting Supported Range of Parameter Values

Command: +PIG=?

Response: +PIG: (<value> range)

Example: +PCW: (0,1)

+PMHF - V.92 Modem-on-Hold Hook Flash

This command causes the modem to initiate the flash hook sequence when in the modem-on­hold procedure. This enables switching to the second call (incoming or outgoing). This
command applies only to V.92 modem-on-hold. There are no parameters associated with this
command.

Syntax

+PMHF

Result Code

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OK When the modem completes the flash hook sequence.

ERROR If this command is initiated and the modem is not on hold.

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+PQC - V.92 Phase 1 and Phase 2 Control

This command controls the global enabling or disabling of the V.92 shortened Phase 1 and
Phase 2 startup procedures. This command is used in conjunction with the +PSS command.

Syntax

+PQC=<value>

Defined Values

<value> Decimal number corresponding to the selected setting.

0 Enable Short Phase 1 and Short Phase 2. (Default.)

1 Enable Short Phase 1 only.

2 Not supported.

3 Disable Short Phase 1 and Short Phase 2.

Result Codes

OK 0, 1, or 3 in V.92 Mode (+MS=V.92)

ERROR Otherwise

Reporting Selected Values

Command: +PQC?

Response: +PQC: <value>

Example: +PQC: 0

Reporting Supported Range of Parameter Values

Command: +PQC=?

Response: +PQC: (<value> range)

Example: +PQC: (0,1,3)

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+PSS - Use Short Sequence

This command causes a calling modem to force either a V.92 short or full startup sequence as
defined by the +PQC command on the next and subsequent connections.

Note: This command is not applicable to HCF products.

Syntax

+PSS=<value>

Defined Values

<value> Decimal number corresponding to the selected sequence.

0 The modems decide whether or not to use the short

startup procedures. The short startup procedures can
only be used if enabled by the +PQC command.
(Default.)

1 Reserved.

2 Forces the use of the full startup procedures on the

next and subsequent connections independent of the
setting of the +PQC command.

Result Codes

OK 0 - 2 in V.92 Mode (+MS=V.92)

ERROR Otherwise

Reporting Selected Values

Command: +PSS?

Response: +PSS: <value>

Example: +PSS: 0 For the default <value>.

Reporting Supported Range of Parameter Values

Command: +PSS=?

Response: +PSS: (<value> range)

Example: +PSS: (0,1,2)

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-QCPC - Force Full Startup Procedure Next Connection

This command causes the modem to use full startup procedures on the next connection
attempt regardless of the setting of the +PQC command. After this attempt, the modem will
select the startup procedure as defined by the +PQC command. If a shortened startup
procedure is enabled by the +PQC command, then the quick connect profile will also be
updated on the next connection attempt.

Syntax

-QCPC

Result Code

OK In V.92 Mode (+MS=V.92)

ERROR Otherwise

-QCPS - Enable Quick Connect Profile Save

This command controls whether or not the modem will save the generated quick connect
profile.

Syntax

-QCPS=<value>

Defined Values

<value> Decimal number corresponding to the desired operation.

0 Do not allow the quick connect profile to be saved.

1 Allow the quick connect profile to be saved.

(Default.)

Result Codes

OK 0 or 1 in V.92 Mode (+MS=V.92) and quick connect is enabled

(+PSS = 0)

ERROR Otherwise

Reporting Selected Value(s)

Command: -QCPS?

Response: -QCPS: <value>

Example: -QCPS: 1 For the default setting.

Reporting Supported Range of Parameter Values

Command: -QCPS=?

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Response: -QCPS: (<value> range)

Example: -QCPS: (0,1)

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