US Robotics 56 K SOFTMODEM - COMMAND REFERENCE REV 1, 56 1 Command Reference Manual

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56K Softmodem

Command Reference

R46.2021.00

rev 1 4/10

56K Softmodem

Command Reference

Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

How to Use This Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

AT Command Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Sample Command. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

E<value>—Command Echo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Basic Syntax Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Extended Syntax Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

S Register Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Sample S2—Escape Character (User-Defined) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Other Document Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

AT Command Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Data and General Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

+++Escape Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

A—Answer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

B<value>—Communication Standard Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

C<value>—Carrier Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

D<dial string>—Dial. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

H<value>—Hook Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

I<value>—Request ID Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

L<value>—Speaker Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

M<value>—Speaker Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

N<value>—Modulation Handshake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

O<value>—Return to On-Line Data Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

P—Select Pulse Dialing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Q<value>—Result Code Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

S<register_number>=<value>—S Register Control . . . . . . . . . . . . . . . . . . . . . . . 16

T—Select Tone Dialing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

V<value>—DCE Response Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

W<value>—Result Code Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

X<value>—Extended Result Codes Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Y<value>—Long-Space Disconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Z<value>—Reset and Recall Stored Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

&B<value>—V.32 Auto Retrain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

&C<value>—Data Carrier Detect (DCD) Control. . . . . . . . . . . . . . . . . . . . . . . . . . 19

&D<value>—Data Terminal Ready (DTR) Control. . . . . . . . . . . . . . . . . . . . . . . . . 20

&F<value>—Restore Factory Default Configuration . . . . . . . . . . . . . . . . . . . . . . . 20

&G<guard tone>—V.22 bis Guard Tone Control . . . . . . . . . . . . . . . . . . . . . . . . . . 21

&J<value>—Auxiliary Relay Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

&K<value>—Local Flow Control Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

&M<value>—Asynchronous Communications Mode . . . . . . . . . . . . . . . . . . . . . . . 22

&P<value>—Pulse Dial Make-to-Break Ratio Selection . . . . . . . . . . . . . . . . . . . . . 22

&Q<value>—Asynchronous Communications Mode . . . . . . . . . . . . . . . . . . . . . . . 22

&S<value>—Data Set Ready (DSR) Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

&T<value>—Self-Test Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

&V<value>—Display Current Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

&W<value>—Store Current Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

&Y<value>—Select Stored Profile for Hard Reset . . . . . . . . . . . . . . . . . . . . . . . . . 25

&Z<storage location>=<dialing sting>—Store Telephone Number . . . . . . . . . . . . . 25

\A<value>—Select Maximum MNP Block Size . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

\B<break time>—Send Break . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

iii

56K Softmodem

Command Reference

\G<value>—Modem Port Flow Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

\J<value>—Adjust Bits/s Rate Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

\K<value>—Set Break Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

\N<error_control>—Select Error Control Mode . . . . . . . . . . . . . . . . . . . . . . . . . . 28

\Q<value>—Local Flow Control Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

\R<value>—Ring Indicator Signal Off After Answer . . . . . . . . . . . . . . . . . . . . . . . 29

\T<time delay>—Inactivity Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

\V<value>—Protocol Result Code. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

%B—View Numbers in Blacklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

%C<value>—Data Compression Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

%E<value>—Auto Fallback/Fallforward Control . . . . . . . . . . . . . . . . . . . . . . . . . . 31

-C<value>—Data Calling Tone. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

-V90=<rate>—Enable/Disable V.90 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

+A8E=<v8o>,<v8a>,<v8cf>,<v8b>—V.8 and V.8 bis Operation Controls . . . . . . . 33

+A8T=<sig-

nal>,<1st_message>,<2nd_message>,<sig_en>,<msg_en>,<supp_delay>—Send

V.8 bis Signal and/or Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

+A8T=<sig-

nal>,<1st_message>,<2nd_message>,<sig_en>,<msg_en>,<supp_delay>—Send

V.8 bis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

+DR<value>—Data Compression Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

+DS=<direction>,<compression_negotiation>,<max_dict>,<max_string>—V.42 bis

Data Compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

+DS44=<direction>,<compression_negotiation>, <capability>,

<max_codewords_tx>,

<max_codewords_rx>,<max_string_tx>,<max_string_rx>,<max_history_tx>,<max_

history_rx>— V.44 Data Compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

+DS44=<direction>,<compression_negotiation>, <capability>,

<max_codewords_tx>,

<max_codewords_rx>,<max_string_tx>,<max_string_rx>,<max_history_tx>,<max_

history_rx> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

+DS44=<direction>,<compression_negotiation>, <capability>,

<max_codewords_tx>,

<max_codewords_rx>,<max_string_tx>,<max_string_rx>,<max_history_tx>,<max_

history_rx>— . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

+EB=<break_selection>,<timed>,<default_length>—Break Handling In Error Control

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

+EFRAM=<value 1>,<value 2>—Frame Length. . . . . . . . . . . . . . . . . . . . . . . . . . 41

+ER=<value>—Error Control Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

+ES=<orig_rqst>,<orig_fbk>,<ans_fbk>—Error Control Selection . . . . . . . . . . . . 42

+ESR=<value>—Selective Repeat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

+ETBM=<pending_TD>,<pending_RD>,<timer>—Call Termination Buffer Management

+EWIND=<value_1>,<value_2>—Window Size . . . . . . . . . . . . . . . . . . . . . . . . . 45

+FCLASS=<value>—Service Class Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

+GCAP—Request Complete Capabilities List . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

+GCI=<T.35_country_code>—Country of Installation . . . . . . . . . . . . . . . . . . . . . 47

+GMM—Modem Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

+GMR—Request Revision Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

+GOI—Request Global Object Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

+GSN—Request Product Serial Number Identification . . . . . . . . . . . . . . . . . . . . . . 49

+IDSR=<value>—Select Data Set Ready Option . . . . . . . . . . . . . . . . . . . . . . . . . 49

+IFC=<DCE_by_DTE>, <DTE_by_DCE>—DTE-DCE Local Flow Control . . . . . . . . . 50

+ILRR=<value>—DTE-DCE Local Rate Reporting . . . . . . . . . . . . . . . . . . . . . . . . . 51

+IPR=<DTE rate>—Fixed DTE Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

+MA=<carrier 1>,<carrier 2>, ...—Modulation Automode Control . . . . . . . . . . . . . 52

+MR=<value>—Modulation Reporting Control. . . . . . . . . . . . . . . . . . . . . . . . . . . 53

+MS=<carrier>,<automode>,<min_rate>,<max_rate>—Modulation Selection . . . 53

+MSC=<src_v34>—Seamless Rate Change Enable . . . . . . . . . . . . . . . . . . . . . . . 56

56K Softmodem

Command Reference

+PCW=<call_waiting>—Call Waiting Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

+PIG=<value>—PCM Upstream Ignore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

+PMH=<value>—Modem On Hold Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

+PMHF—Modem On Hold Hook Flash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

+PMHR—Initiate Modem On Hold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

+PMHT=<value>—Modem On Hold Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

+VCID=<value>—Caller ID. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Fax Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

FAX Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

+FAA=<value>—Adaptive Answer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

+FCLASS=1—Enter Class 1 FAX Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

+FMI?—Manufacturer Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

+FMM?—Product Identification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

+FMR?—Version/Revision Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

+FPR=<value>—Select FAX Port Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

+FRH=<mod>—Receive HDLC Data with <mod> Carrier . . . . . . . . . . . . . . . . . . . 64

+FRM=<mod>—Receive Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

+FRS=<value>—Receive Silence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

+FTH=<mod>—Transmit HDLC Data with <mod> Carrier . . . . . . . . . . . . . . . . . . 66

+FTM=<mod>—Transmit FAX Data with <mod> Carrier . . . . . . . . . . . . . . . . . . . 67

+FTS=<value>—Transmission Silence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Test and Debug AT Command. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

#UD—Unimodem Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Result Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

S-Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

S-Register Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

S0—Auto-Answer Ring Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

S1—Ring Counter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

S2—AT Escape Character (User-Defined) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

S3—Carriage Return Character (User-Defined) . . . . . . . . . . . . . . . . . . . . . . . . . . 86

S4—Line Feed Character (User-Defined) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

S5—Back Space Character (User-Defined). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

S6—Time for Dial Tone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

S7—Wait Time for Carrier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

S8—Pause Time for Dial Delay Modifier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

S11—DTMF Tone Duration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

S12—Escape Guard Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

S20—Sync Mode Underrun Fill Character. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

S21—V.24/General Bit-Mapped Options Status . . . . . . . . . . . . . . . . . . . . . . . . . . 89

S29—Flash Dial Modifier Duration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

S30—Inactivity Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

S36—LAPM Failure Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

S37—Dial Line Rate* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

S48—LAPM Error Control and Feature Negotiation . . . . . . . . . . . . . . . . . . . . . . . . 91

S54—Blind Dialing Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

S91—Data Transmit Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

S92—FAX Transmit Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

S93—DTMF Transmit Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

S94—DTMF Transmit Level for High DTMF Group . . . . . . . . . . . . . . . . . . . . . . . . . 93

AT Command Cross Reference Tables . . . . . . . . . . . . . . . . . . . . . . . 94

56K Softmodem

Command Reference

Introduction

Overview

The following reference manual specifies the command set for the 56K Softmodem.

The 56K Softmodem supports a broad base of commands for data and FAX. The command set includes support for the basic data commands standardized by ITU-

T recommendation V.250 ITU-T recommendation T.31 (08/95).

This document contains an overview of the supported commands, responses, and registers used by the 56K Softmodem. However, a particular modem may not support the entire AT command set. Some features are dependent on product application, licensing, and other contractual agreements.

56K Softmodem

Command Reference

(05/99), and class 1 FAX commands standardized by

How to Use This Manual

The 56K Softmodem AT command set consists of commands based on data and FAX communication. The commands presented in this manual follow the conventions set by ITU-T recommendation V.250 (05/99), which standardized many of the common AT extensions.

This section identifies the relevant standards from V.250 and any modifications to presentation that have been made for clarity and ease of use.

The 56K Softmodem AT command set also includes commands that have not been standardized by a specific ITU recommendation. Some of these commands support legacy systems, other commands support test and debug efforts, and others support features which are specific to USRobotics’s products.

1.* This document contains additional commands that support V.92.

- 1

56K Softmodem

Command Reference

- 2

AT Command Conventions

This document describes the AT commands and S registers supported in the USRobotics 56K Softmodem. Presentation format for each command has a standard layout consisting of the following:

• A command title.

• A general command description.

• Result codes including the conditions for obtaining the result.

• A detailed command description.

The command title is formatted in large bold letters and contains the command, its parameters, and a descriptive command name. The general command description identifies in broad terms the function of the command and when to use it. The detailed command description breaks down the effect of each of the parameters’ values. This section may also contain supplementary information needed for proper usage of the command.

56K Softmodem

Command Reference

The modem or data circuit terminating equipment (DCE) returns at least one result code for each command submitted to it by the host system or data terminal equipment (DTE). Conditions for receiving the result code follow the listed result code.

Sample Command

E<value>—Command Echo

Use this command to instruct the modem to echo characters sent to it. When the echo feature is selected, characters sent to the modem are sent back to the host and displayed on the monitor.

Result codes:

OK if <value> = 0—1.

ERROR if <value> does not equal 0—1.

- 3

Table 2-1: E<value> Commands

Command Function

E0 Disables echo command.

E1 Enables echo command (default).

Basic Syntax Commands

Basic syntax commands use the following format:

<command>[<parameter>]

••

Where <command> is a single character or a group of characters that represent the command and <parameter> is an optional decimal number. There are some exceptions to these rules and they are noted for each command as needed. The echo command in the previous example follows the basic commands syntax structure.

56K Softmodem

Command Reference

Extended Syntax Commands

Extended syntax commands2 have three different command formats:

• No parameters: +<name>

• Single parameter: +<name>[=<parameter>]

• Multiple parameters: +<name>[=<parameter1>][,<parameterX>]

Where <name> is the name of the command and begins with an alphanumeric character and <parameterX> is an optional decimal number. There are some exceptions to these rules, and they are noted for each command as needed.

In addition to the standard command format, extended commands have a read and test syntax. The host system uses the read syntax to pole the modem and determine the current setting for the command parameters. Read syntax has the following format:

Read syntax: +<name>?

The host system uses the test syntax to pole the modem and determine the supported parameter values for the command. Test syntax has the following format:

2. * The description of extended syntax commands presented here is a simplified version of the information presented in ITU-T recom-

mendation V.250 (05/99). For further details, refer to Section 5.4 of recommendation V.250.

- 4

Test syntax: +<name>=?

The modem responds to this command with a list of the supported parameter ranges.

S Register Conventions

S registers contain parameters used by the modem. The presentation format for an S register is similar to the format used for an AT command. Each S register has a standard layout consisting of the following:

S register title.

S register description.

Parameter description.

The S register title is formatted in large bold letters and begins with a capital S followed by the register number. The title also includes a descriptive name for the register. The S register description defines the parameter the S register represents.

56K Softmodem

Command Reference

S register parameters can have a variety of effects on the functionality of the modem. As a result, the parameter description can have several forms. The most common form includes the parameter range, the parameter default, and the units used by the parameter.

Sample S2—Escape Character (User-Defined)

S2 contains the decimal value of the ASCII character used as the escape character. The default value corresponds to an ASCII +. The escape sequence allows the modem to exit data mode and enter command mode when on-line. A value over 127 disables the escape process, i.e., no escape character will be recognized.

Range: 0—255.

Default: 43 (+).

Units: ASCII.

Other Document Conventions

For the sake of clarity, the following conventions have been adopted and used throughout this document.

- 5

56K Softmodem

Command Reference

Table 2-2: Other Document Conventions

Item Example Conventions Description

AT Command &C<value> AT commands are all capitals followed by their parameter values in bold print.

This document does not explicitly use the AT prefix when presenting commands. However, the AT prefix is used for all examples.

S Registers S<value> S registers have a capital S followed by the register number.

Parameters <value> Parameters or variables always use lowercase lettering enclosed in brackets,

<>.

Results Codes OK Result codes are all capitals and italics.

Examples

—

Examples use the courier font and are shown exactly as they appear when the commands are entered into a terminal program such as Windows

nal.

** Windows is a register trademark of Microsoft Corporation.

Hypertermi-

- 6

56K Softmodem

Command Reference

AT Command Set

AT commands are issued to the modem to control the modem’s operation and software configuration. The basic command syntax is as follows:

• <command><parameter>.

The <command> is a combination of the attention prefix (AT) followed by the AT command. The <parameter> is a string that represents a numeric decimal value.

Note:If a parameter value is not entered, then the 56K Softmodem assumes a parameter value of zero.

Any command issued is acknowledged with a response in either text or numeric values. These responses are known as result codes. The result codes are listed in Table 5-1: Result Code Summary.

AT commands can only be entered while the modem is in command mode. Command mode is entered under one of the following conditions:

After powerup, at the termination of a connection, or after the execution of a command other than dial or answer.

Upon the receipt of the escape sequence (three consecutive characters matching the contents of register S2) while in on-line mode.

Upon the on-to-off transition of DTR if &D1, &D2, or &D3 has been set.

Data and General Commands

+++Escape Sequence

An escape sequence allows the modem to exit data mode and enter on-line command mode. While in on-line command mode, AT commands are sent directly to the modem. Use the return to on-line data mode command (see “O<value>— Return to On-Line Data Mode” on page 15) to return to data mode.

Place a pause before and after the escape sequence to prevent the modem from interpreting the escape sequence as data. The length of the pause is set by register S12 (see “S12—Escape Guard Time” on page 88), the escape guard time. Register S2 (see “S2—AT Escape Character (User-Defined)” on page 86) identifies the escape sequence character.

A/—Repeat Last Command

Use this command to repeat the last AT command. The modem repeats the command currently in the command buffer. Do not use the AT prefix with this command. Do not conclude the command with a terminating character such as enter.

- 7

A—Answer

This command instructs the 56K Softmodem to go off-hook and answer an incoming call.

B<value>—Communication Standard Setting

Use this command to select the communication standard used by the 56K Softmodem.

Result codes:

OK if <value> = 0—3, 15, 16.

ERROR if <value> does not equal 0—3, 15, 16.

Table 3-1: B<value> Commands

Command Function

56K Softmodem

Command Reference

B0 Selects CCITT V.22 mode when the modem is at 1200 bits/s.

B1 Selects Bell 212A when the modem is at 1200 bits/s (default).

B2 Deselects V.23 reverse channel (same as B3).

B3 Deselects V.23 reverse channel (same as B2).

B15 Selects V.21 when the modem is at 300 bits/s.

B16 Selects Bell 103J when the modem is at 300 bits/s (default).

C<value>—Carrier Control

This command is supported to ensure compatibility with communications software that issues the C1 command. However, this modem does not support the C0 command. The C0 command instructs some modems not to send carrier (i.e., it puts them in receive-only mode).

Result codes:

OK if <value> = 1.

ERROR if <value> does not equal 1.

Table 3-2: C<value> Commands

Command Function

C1 Normal transmit carriet switching (default).

D<dial string>—Dial

This command instructs the 56K Softmodem to go off-hook and begin the dialing

- 8

56K Softmodem

Command Reference

sequence. The dial string (<dial string>, including modifiers and the telephone number) is entered after the D command.

A dial string can be up to sixty characters long. Any digit or symbol may be dialed as touchtone digits. Characters such as spaces, hyphens, and parentheses are ignored by the modem and may be included in the dial string to enhance readability.

Table 3-3:

Dial Modifiers

Modifier Function Name Description

L Dial the last number Instructs the modem to dial the last number dialed. This modi-

fier is valid only if it is the first symbol of the dial string. All consecutive characters are discarded.

P Select pulse dialing

T Select tone dialing (default)

W Wait for dial tone Instructs the modem to wait for a second dial tone before

, Dial pause Instructs the modem to pause before processing the next char-

! Hook flash Instructs the modem to go on-hook for 0.5 s and then return to

@ Wait for quiet answer Instructs the modem to wait for 5 s of silence after dialing the

; Return to command mode Instructs the modem to return to command mode after it has

—

processing the dial string.

acter in the dial string. Register S8 (see “S8—Pause Time for Dial Delay Modifier” on page 88) determines the length of the pause.

off-hook.

number. If silence is not detected, the modem sends a NO ANSWER result code back to the user.

finished dialing without disconnecting the call. This modifier must be the last character in the dial string.

$ Bong tone detection

S=<location> Dial from register Instructs the modem to dial a telephone number previously

E<value>—Echo Command

Use this command to enable or disable the 56K Softmodem echo feature. When the echo feature is selected and the modem is in command mode, characters sent to the modem are sent back to the host and displayed on the monitor.

Result codes:

OK if <value> = 0—1.

ERROR if <value> does not equal 0—1.

—

stored using the &Z<location>=<dial string> command. Valid storage locations are 0—3.

- 9

Table 3-4: E<value> Commands

Command Function

E0 Disables echo command.

E1 Enables echo command (default).

F<value>—On-Line Data Character Echo Command

This command is supported to ensure compatibility with communications software that issues the F1 command. The F0 version of this command is not supported. This command was originally used to set echo features for the DTE.

Result codes:

OK if <value> = 1.

ERROR if <value> does not equal 1.

Table 3-5: F<value> Commands

56K Softmodem

Command Reference

Command Function

F0 On-line data character echo enabled (not supported).

F1 On-line data character echo disabled.

H<value>—Hook Control

This command instructs the modem to go either on-hook to disconnect a call or off-hook to make the telephone line busy.

Result codes:

OK if <value> = 0—1*.

ERROR if <value> does not equal 0—1.

Command Function

Table 3-6: H<value> Commands

56K Softmodem goes on-hook (default).

56K Softmodem goes off-hook.

I<value>—Request ID Information

This command displays specific product information about the modem. Result codes:

As described in Table 3-7: if <value> = 0—11.

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56K Softmodem

Command Reference

ERROR if <value> does not equal 0—11.

Note:ITU-T Recommendation V.250 (05/99) standardized this command. However, the standard does not

include the additional functionality added with the H1 command.

Table 3-7:

TI<value> Commands

Command Function

I0, I3 Returns modem identity string and driver version number.

I1 Returns OK.

I2 Returns OK.

I4 Returns the driver build date.

I5 Returns the driver version, bus type (PCI, AC97), codec type, and country.

I6 Returns OK.

I7 Hardware version.

I8 Codec type.

I9 Returns country ID in English.

I10, I11 Displays connection information as described below. If the modem has not connected with a

remote DCE the ATI 11 commands returns No Previous Call.

The ATI11 results are listed on two screens. To get to the second screen, the user must hit any key. The following is an example of the AT I11 results.

Description Status

Last Connection V.90

Initial Transmit Carrier Rate 26400

Initial Receive Carrier Rate 52000

Final Transmit Carrier Rate 26400

Final Receive Carrier Rate 52000

Protocol Negotiation Result LAPM

Data Compression Result V.42bis

Estimated Signal/Noise Ratio (dB) 46

Receive Signal Power Level (-dBm) 33

Transmit Signal Power Level (-dBm) 18

Round Trip Delay (msec) 13

Near Echo Level (-dBm) 24

Far Echo Level (-dBm) 80

- 11

Transmit Frame Count 0

Transmit Frame Error Count 0

Receive Frame Count 0

Receive Frame Error Count 0

Retrain by Local Modem 0

Retrain by Remote Modem 0

Rate Renegotiation by Local Modem 0

Rate Renegotiation by Remote Modem 0

Call Termination Cause 1

Robbed-Bit Signaling 0

Digital Loss (dB) 06

Remote Server ID NA

56K Softmodem

Command Reference

The ATI11 command may be issued from on-line command mode or after the end of a call. After a call, some of the values are no longer valid. The following table describes each of the results listed for the ATI11 command.

- 12

56K Softmodem

Command Reference

Table 3-8: ATI11 Command Results

Result Description

Last Connection V.92, V.90, V.34, or V.32, depending on the type of connection negoti-

ated.

Initial Transmit Carrier Rate Initial upstream rate.

Initial Receive Carrier Rate Initial downstream rate.

Final Transmit Carrier Rate Current or final upstream rate.

Final Receive Carrier Rate Current or final downstream rate.

Protocol Negotiation Result LAPM, MNP *, or none, depending on V.42 negotiation.

Data Compression Result LAPM, MNP, or none, depending on V.42 negotiation.

Estimated Signal/Noise Ratio Signal to noise ratio with implied negative. Higher values indicated better

conditions.

Receive Signal Power Level (–dBm) The received signal power, although labeled with units of –dBm, is only a

relative measure for comparing calls to/from different locations. This value is valid only during a call.

Transmit Signal Power Level (– dBm) Upstream transmit signal power.

Round Trip Delay (ms) Round trip delay in milliseconds.

Near Echo Level (–dBm) Near echo levels only.

Far Echo Level (–dBm) Far echo levels only.

Transmit Frame Count Number of LAPM frames sent upstream during this call. Count wraps

around at 65535.

Transmit Frame Error Count Number of REJ frames received at the analog client modem.

Receive Frame Count Number of LAPM frames received by the client during this call. Count

wraps around at 65535.

Receive Frame Error Count Number of frames received in error by the client.

Retrain by Local Modem Number of retrains or rate renegotiations requested by the modem.

Retrain by Remote Modem Number of retrains or rate renegotiations requested by the remote

modem.

Call Termination Cause Reason for call ending. Only valid after call ends. Result codes are as fol-

lows: • 0 = local modem command: ATH, DTR drop. • 1 = remote modem: cleardown, loss of signal. • 2 = no answer, busy, etc. • 3 = training failure V.90 or V.34. • 4 = protocol failure if required by \N4, for example.

Robbed-Bit Signaling For PCM connection only, a hexadecimal 6-bit pattern of T1 frames with

robbed-bit signaling.

Digital Loss (dB) For PCM connection only, the downstream digital loss.

Remote Server ID

Note:* MNP is a trademark of Microcom Sysems, Inc.

—

- 13

L<value>—Speaker Volume

Use this command to set the monitor speaker volume setting when the speaker is on. Result codes:

OK if <value> = 0—3.

ERROR if <value> does not equal 0—3.

Command Function

L0 Low volume.

L1 Low volume.

L2 Medium volume (default).

L3 High volume.

56K Softmodem

Command Reference

Table 3-9: L<value> Commands

M<value>—Speaker Control

Use this command to turn the monitor speaker on or off. Result codes:

OK if <value> = 0—3.

ERROR if <value> does not equal 0—3.

Table 3-10: M<value> Commands

Command Function

M0 Speaker is off.

M1 Speaker is on until the modem detects the carrier signal (default).

M2 Speaker is always on when the modem is off-hook.

M3 Speaker is on until the carrier is detected, except when dialing.

N<value>—Modulation Handshake

Use this command to set the modem protocol for handling handshake negotiation at connection time if the communication speed of the remote modem is different from the speed of the local modem.

Result codes:

OK if <value> = 0—1.

ERROR if <value> does not equal 0—1.

- 14

56K Softmodem

Command Reference

Table 3-11: N<value> Commands

Command Function

N0 When originating or answering, this is for handshake only at the communication standard

specified by register S37 (see “S37—Dial Line Rate*” on page 90) and the B<value> (“B<value>—Communication Standard Setting” on page 8) command.

N1 When originating or answering, begin the handshake only at the communication standard

specified by S37 and the B<value> command. During handshake, fallback to a lower speed may occur (default).

O<value>—Return to On-Line Data Mode

Use this command to exit on-line command mode and reenter on-line data mode. If the modem is not in on-line command mode when this command is received, it generates an ERROR result code.

Result codes:

CONNECT if <value> = 0, 1, 3 and the result code and call progress monitor is set to 0 (X0).

CONNECT <text> if <value> = 0, 1, 3 and the result code and call progress monitor is not set to 0 (X<value> where <value> = 1—7).

NO CARRIER if the connection is not successfully resumed.

ERROR if <value> does not equal 0—1, 3.

Table 3-12: O<value> Commands

Command Function

O1 Issues a retrain before returning to on-line data mode.

O3 Issues a rate renegotiation before returning to on-line data mode.

Instructs the 56K Softmodem to exit on-line command mode and return to data mode (“+++Escape Sequence” on page 7).

P—Select Pulse Dialing

Use this command to configure the modem for pulse dialing. All subsequent D<dial string> commands use pulse dialing until either the T command or a tone dial modifier is received by the modem. Tone dialing is the default setting. Do not supply parameters with this command unless it is used as part of a dial modifier.

Q<value>—Result Code Control

Result codes are informational messages sent from the modem and displayed on the monitor. Basic result codes include OK, CONNECT, RING, NO CARRIER, and ERROR. The Q<value> command allows the user to turn result codes on or off.

- 15

Result codes:

56K Softmodem

Command Reference

OK if <value> = 0—1.

ERROR if <value> does not equal 0—1.

Table 3-13:

Q<value> Commands

Command Function

Q0 Enables result codes (default).

Q1 Disables result codes.

S<register_number>=<value>—S Register Control

Use this command to view or change an S-register. S-registers contain parameters used by the modem. This command has two forms: one to show the contents of the register and one to change the contents of the register. Some registers are read only and are not affected by the S<register number>=<value> command. Each register has a specific function. See “S-Registers” on page 84.

Result codes:

OK if <register number> is a valid register (see Table 5-3: S-Register Summary).

ERROR if <register number> is not a valid register.

Table 3-14: S<register_number> Extended Syntax Commands

Syntax Function

S<register_number>? Displays register contents.

S<register_number>=<value> Sets the contents of the register to <value> if the register is not read

only.

T—Select Tone Dialing

Use this command to configure the modem for DTMF tone dialing. All subsequent D<dial string> commands use tone dialing until either the P command or a pulse dial modifier is received by the modem. Tone dialing is the default setting. Do not supply parameters with this command unless it is used as part of a dial modifier.

V<value>—DCE Response Format

The 56K Softmodem generate result codes using one of two formats. Verbose mode generates result codes in a text format using words. Numerical mode generates result codes as a number. Each result code has a number assigned to it (see “Result Codes” on page 81). Use this command to switch between numerical and verbose modes. Call progress and negotiation progress messages are affected by this command.

- 16

Result codes:

Command Function

V0 Displays result codes as digits. Numerical mode.

V1 Displays result codes as text (default). Verbose mode.

56K Softmodem

Command Reference

OK if <value> = 0—1.

ERROR if <value> does not equal 0—1.

Table 3-15: V<value> Commands

Table 3-16:

V<value> Result Code Formats

Command Result Code Format

V0 <numeric code><CR>

V1 <CR><LF><verbose code><CR><LF>

W<value>—Result Code Option

Use this command to select the modems CONNECT message options. Result codes:

OK if <value> = 0—2.

ERROR if <value> does not equal 0—2.

Table 3-17: W<value> Commands

Command Function

W0 CONNECT result code reports DTE receive speed. Disables protocol result codes.

W1 CONNECT result code reports DTE receive speed. Enables protocol result codes.

W2 CONNECT result code reports DCE receive speed. Enables protocol result codes (default).

X<value>—Extended Result Codes Control

Use this command to select which result codes are used by the modem. The parameter of this command is stored in bits 4—6 of register S22.

- 17

56K Softmodem

Command Reference

Table 3-18: X<value> Commands

Command Description

X0 Busy detection is disabled; blind dialing (no dial tone detection) is enabled. The following result

codes are supported: • OK • CONNECT • RING • NO CARRIER • ERROR

X1 Busy detection is disabled; blind dialing (no dial tone detection) is enabled. The following result

codes are supported: • OK • RING • NO CARRIER • ERROR • CONNECT <RATE>

X2 Busy detection is disabled; blind dialing is disabled. The dialing cannot be conducted unless a dial

tone is detected. If dial tone is not detected within the time specified by register S6, the NO DIAL-

TONE result code will be reported. The following result codes are supported: • OK • RING • NO CARRIER • ERROR • NO DIALTONE • CONNECT <RATE>

X3 Busy detection is enabled; blind dialing is enabled. The following result codes are supported: • OK

• RING • NO CARRIER • ERROR • BUSY • CONNECT <RATE> • BLACKLISTED

X4 Busy detection is enabled; blind dialing is disabled. The dialing cannot be conducted unless a dial

tone is detected. If dial tone is not detected within the time specified by register S6, the NO DIAL-

TONE result code will be reported. The following result codes are supported: • OK • RING • NO CARRIER • ERROR • NO DIALTONE • BUSY • CONNECT <RATE> • DELAYED • BLACKLISTED

• WARBLE • CALL WAITING DETECTED

X5 Busy detection is enabled; blind dialing is disabled. The dialing cannot be conducted unless a dial

tone is detected. If dial tone is not detected within the time specified by register S6, the NO DIAL-

TONE result code will be reported. The following result codes are supported: • CARRIER • ERROR • NO DIALTONE • BUSY • CONNECT <RATE> • RRING • NO BONGTONE • DELAYED • BLACKLISTED • WARBLE • CALL WAITING DETECTED

OK • RING • NO

Y<value>—Long-Space Disconnect

This command is supported to ensure compatibility with communication software that issues the Y0 command. Long-space disconnect is always disabled.

Result codes:

OK if <value> = 0.

ERROR if <value> does not equal 0.

Table 3-19: Y<value> Commands

Command Function

Y0 Disabld long-space disconnect (default).

Z<value>—Reset and Recall Stored Profile

Use this command to force the 56K Softmodem to go on-hook and restore a profile saved by the &W command. The 56K Softmodem has two stored profiles and the active profile. The <value> parameter selects the stored profile to copy into the active profile.

- 18

Result codes:

OK if <value> = 0, 1.

ERROR if <value> does not equal 0, 1.

Table 3-20: Z<value> Commands

Command Function

Z0 Reset and restore stored profile 0.

Z1 Reset and restore stored profile 1.

&B<value>—V.32 Auto Retrain

This command is supported to ensure compatibility with communications software that issues the B1 command. The B0 version of this command is not supported.

Result codes:

56K Softmodem

Command Reference

OK if <value> = 1.

ERROR if <value> does not equal 1.

Table 3-21: &B<value> Commands

Command Function

&B0 Disable V.32 auto-retrain (not supported).

&B1 Enable V.32 auto-retrain (default).

&C<value>—Data Carrier Detect (DCD) Control

Use this command to control the modem’s response to receiving a remote modems carrier signal. Data carrier detect (DCD) is a signal from the modem to the DTE indicating that the carrier signal is being received from a remote modem. The modem typically turns off DCD when it no longer detects the remote modems carrier signal.

Result codes:

OK if <value> = 0—1.

ERROR if <value> does not equal 0—1.

- 19

56K Softmodem

Command Reference

Table 3-22: &C<value> Commands

Command Function

&C0 Modem ignores the state of the carrier from the remote modem. DCD remains on at all times.

&C1 Modem turns on DCD when the remote modem’s carrier signal is detected and turns off DCD

when the carrier signal is not detected (default).

&D<value>—Data Terminal Ready (DTR) Control

Use this command to set how the 56K Softmodem responds to the DTR signal. Result codes:

OK if <value> = 0—3.

ERROR if <value> does not equal 0—3.

Table 3-23: &D<value> Commands

Command Function

&D0

&D1 If the DTR signal is not detected while in on-line data mode, the modem enters command

&D2 If the DTR signal is not detected while in on-line data mode, the modem disconnects

&D3* Reset modem on the on-to-off DTR transition.

The 56K Softmodem ignores the true status of DTR and treats it as always on. Use this selection only if the computer does not provide DTR to the modem.

mode, issues the OK result code, and remains connected.

(default).

Note:ITU-T Recommendation V.250 (05/99) standardized this command. However, the standard does not

include the additional functionality added with the D3 command.

&F<value>—Restore Factory Default Configuration

Use this command to reset the modem to the configuration programmed at the factory. This operation replaces all of the command options* and S-register settings in the active configuration with factory default values.

Result codes:

OK if <value> = 0.

ERROR if <value> does not equal 0.

- 20

56K Softmodem

Command Reference

Table 3-24: &F<value> Commands

Command Function

&F0 Restores factory default configuration.

&G<guard tone>—V.22 bis Guard Tone Control

Use this command to select which guard tone, if any, the modem will send while transmitting in the high band (answer mode). This command is only used in V.22 and V.22 bis mode. This option is not used in North America; it is for international use only.

Result codes:

OK if <guard tone> = 0—2.

ERROR if <guard tone> does not equal 0—2.

Note:* There are several noted exceptions to this command, and caution should be used when determin-

ing the state of the command options once this command has been executed.

Table 3-25:

&G<guard tone> Commands

Command Function

&G0 Disables guard tone (default).

&G1 Selects 550 Hz guard tone.

&G2 Selects 1800 Hz guard tone.

&J<value>—Auxiliary Relay Option

This command is supported to ensure compatibility with communications software that issues the J0 command. Result codes:

OK if <value> = 0.

ERROR if <value> does not equal 0.

&J<value> Commands

Command Function

&J0 The Auxiliary relay is never closed (default).

&K<value>—Local Flow Control Selection

Use this command to set the 56K Softmodem flow control method. Result codes:

OK if <value> = 0, 3, or 4.

- 21

56K Softmodem

Command Reference

ERROR if <value> does not equal 0, 3, or 4.

Table 3-26: &K<value> Commands

Command Function

&K0 Disables flow control.

&K3 Enables RTS/CTS (hardware) flow control (default).

&K4 Enables XON/XOFF flow control.

&M<value>—Asynchronous Communications Mode

This command is supported to ensure compatibility with communication software that issues the &M0 command. The preferred method for changing the asynchronous communication mode is to use the \N<error control mode> command.

Result codes:

OK if <value> = 0.

ERROR if <value> does not equal 0.

Table 3-27:

&M<value> Commands

Command Function

&M0 Asynchronous mode (default).

&P<value>—Pulse Dial Make-to-Break Ratio Selection

This command is effective only for Japan. Result codes:

OK if <value> = 0—2.

ERROR if <value> does not equal 0—2.

Table 3-28: &P<value> Commands for Domestic Versions

Command Function

&P0 Selects 39%—61% make/break ratio at 10 pulses per second.

&P1 Selects 33%—67% make/break ratio at 10 pulses per second (default).

&P2 Selects 33%—67% make/break ratio at 20 pulses per second.

&Q<value>—Asynchronous Communications Mode

This command is supported to ensure compatibility with communication software that issues the &Q<value> command. The preferred method for changing the

- 22

56K Softmodem

Command Reference

asynchronous communication mode is to use the \N<error control mode> command.

Result codes:

OK if <value> = 0, 5, 6, 8, or 9.

ERROR if <value> does not equal 0, 5, 6, 8, or 9.

Table 3-29: &Q<value> Commands

Command Function

&Q0 Asynchronous mode, buffered. Same as \N0.

&Q5 Error control mode, buffered (default). Same as \N3.

&Q6 Asynchronous mode, buffered. Same as \N0.

&Q8 MNP error control mode. If an MNP error control protocol is not established, the modem will

fall back according to the current user setting in register S36.

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

will fall back according to the current user setting in register S36.

&S<value>—Data Set Ready (DSR) Option

Use this command to controls DSR action. Result codes:

OK if <value> = 0—1.

ERROR if <value> does not equal 0—1.

Table 3-30: &S<value> Commands

Command Function

&S0 DSR is always on (default).

&S1 DSR comes on after establishing a connection and goes off when the connection ends.

&T<value>—Self-Test Commands

Use this command to perform diagnostic tests on the modem. Each test is designed to isolate a problem location when experiencing periodic data loss or random errors.

Result codes:

OK if <value> = 0.

CONNECT if <value> = 1, 3, or 6.

ERROR if <value> does not equal 0, 1, 3, or 6.

- 23

56K Softmodem

Command Reference

Table 3-31: &T<value> Commands

Command Function

&T0 Abort. Terminates the test in progress.

&T1 Initializes local analog loopback, V.56 Loop 3. If a connection exists when this command is

issued, the modem hangs up. The modem displays the CONNECT <rate> message at the start of the test.

&T3

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

&V<value>—Display Current Configuration

Result codes:

Local digital loopback test, V.54 Loop2. If no connection exists, the 56K Softmodem returns ERROR.

the 56K Softmodem returns ERROR and generates the CONNECT<rate> result code.

Use this command to display the current 56K Softmodem configuration. The modem maintains two stored profiles and the active profile. This command displays all three configurations and any stored telephone numbers.

OK if <value> = 0.

ERROR if <value> does not equal 0.

The following is an example of the AT& V0 results.

ACTIVE PROFILE: B1 L2 M1 E1 N1 Q0 V1 W2 X1 Y0 &C1 &D2 &G0 &J0 &K3 &L0 &Q5 &S0 %C3 %E2 \J0 S00:001 S01:000 S02:043 S03:013 S04:010 S05:008 S06:003 S07:060 S08:002 S09:050 S10:014 S11:095 S12:050 S14:138 S18:000 S20:000 S21:048 S22:022 S23:008 S27:073 S28:160 S29:050 S30:000 S31:010 S32:010 S33:000 S35:000 S36:007 S37:000 S38:002 S39:003 S40:040 S41:107 S42:001 S43:001 S48:007 S49:027 S50:015 S51:095 S52:007 S53:047 S54:002 S55:035 S56:000 S57:000 S58:030 S60:255 S61:000 S62:000 S63:030 S70:000 S83:005 S90:000 S91:010 S92:010 S93:006 S94:000 S95:129

STORED PROFILE 0: B1 L2 M1 E1 N1 Q0 V1 W2 X1 Y0 &C1 &D2 &G0 &J0 &K3 &L0 &Q5 &S0 %C3 %E2 \J0 S00:001 S01:000 S02:043 S03:013 S04:010 S05:008 S06:003 S07:060 S08:002 S09:050 S10:014 S11:095 S12:050 S14:138 S18:000 S20:000 S21:048 S22:022 S23:008 S27:073 S28:160 S29:050 S30:000 S31:010 S32:010 S33:000 S35:000 S36:007 S37:000 S38:002 S39:003 S40:040 S41:107 S42:001 S43:001 S48:007 S49:027 S50:015 S51:095 S52:007 S53:047 S54:002 S55:035 S56:000 S57:000 S58:030 S60:255 S61:000 S62:000 S63:030 S70:000 S83:005 S90:000 S91:010 S92:010 S93:006 S94:000 S95:129

STORED PROFILE 1:

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B1 L2 M1 E1 N1 Q0 V1 W2 X1 Y0 &C1 &D2 &G0 &J0 &K3 &L0 &Q5 &S0 %C3 %E2 \J0 S00:002 S01:000 S02:043 S03:013 S04:010 S05:008 S06:003 S07:060 S08:002 S09:050 S10:014 S11:095 S12:050 S14:138 S18:000 S20:000 S21:048 S22:022 S23:008 S27:073 S28:160 S29:050 S30:000 S31:010 S32:010 S33:000 S35:000 S36:007 S37:000 S38:002 S39:003 S40:040 S41:107 S42:001 S43:001 S48:007 S49:027 S50:015 S51:095 S52:007 S53:047 S54:002 S55:035 S56:000 S57:000 S58:030 S60:255 S61:000 S62:000 S63:030 S70:000 S83:005 S90:000 S91:010 S92:010 S93:006 S94:000 S95:129

TELEPHONE NUMBERS: 0 = 5557107 1 = 5557106 2 = 3 =

&W<value>—Store Current Configuration

56K Softmodem

Command Reference

Use this command to store the modems command options and all S registers except S3, S4, and S5. The Z<value> command or a powerup reset, of the modem, restores this profiles.

Result codes:

OK if <value> = 0, 1.

ERROR if <value> does not equal 0, 1.

Table 3-32: &W<value> Commands

Command Function

&W0 Stores the current configuration as profile 0.

&W1 Stores the current configuration as profile 1.

&Y<value>—Select Stored Profile for Hard Reset

This command does not change the behavior of the modem but is included for compatibility with applications that issue the &Y command.

Result codes:

OK if <value> = 0, 1.

ERROR if <value> does not equal 0, 1.

&Z<storage location>=<dialing sting>—Store Telephone Number

Use this command to store a dialing string. The 56K Softmodem can save four

- 25

dialing strings. The dial string may contain up to 34 characters. The ATDS=<storage location> command (see “D<dial string>—Dial” on page 8) dials using the stored string.

Result codes:

OK if <storage location> = 0—3.

ERROR if <storage location> does not equal 0—3.

\A<value>—Select Maximum MNP Block Size

The modem will operate an MNP error corrected link using a maximum block size controlled by the \A parameter. Result codes:

OK if <value> = 0—3.

ERROR if <value> does not equal 0—3.

Table 3-33: \A<value> Commands

56K Softmodem

Command Reference

Command Function

\A0 64 characters.

\A1 128 characters.

\A2 192 characters.

\A3 256 characters (default).

\B<break time>—Send Break

Use this command in non-error-controlled mode. It instructs the modem to transmit a break signal to the remote modem. The minimum break length is 100 ms and the maximum break length is 900 ms. The <break time> parameter has values between one and nine with each increment representing 100 ms.

The command works in conjunction with the \K command (see “\K<value>—Set Break Control” on page 27).

Result codes:

OK if <break time> = 1—9 and connected in data modem mode.

ERROR if <break time> does not equal 1—9.

NO CARRIER if not connected or if connected in FAX modem mode. This result is

contingent upon have a valid <break time>.

\G<value>—Modem Port Flow Control

Instructs the DCE to process XON/XOFF flow control or pass XON/OFF flow

- 26

56K Softmodem

Command Reference

control to the remote DCE. Result codes:

OK if <value> = 0—1.

ERROR if <value> does not equal 0—1.

Table 3-34: \G<value> Commands

Command Function

\G0 The modem processes XON/XOFF flow control characters locally (default).

\G1 The modem passes XON/XOFF flow control characters.

\J<value>—Adjust Bits/s Rate Control

Use this command to specify whether or not the negotiated connect speed of the modem forces the adjustment of the speed of the DTE to the modem’s speed.

Result codes:

OK if <value> = 0—1.

ERROR if <value> does not equal 0—1.

Table 3-35: \J<value> Commands

Command Function

\J0 Buffer mode. Error control is set or disabled with the \N<value> command (default).

\J1 Forces the maximum DCE rate to the DTE rate.

\K<value>—Set Break Control

Use this command to control the response of the modem to a break received from the DTE, remote modem, or the \B<value> command.

Result codes:

OK if <value> = 0—5.

ERROR if <value> does not equal 0—5.

The response is different in three separate cases. The first case is where the modem receives a break from the DTE when it is operating in data transfer mode. See Table 3-36: \K<value> Commands When Modem Is Operating in Data Transfer Mode.

- 27

56K Softmodem

Command Reference

Table 3-36: \K<value> Commands When Modem Is Operating in Data Transfer Mode

Command Function

\K0, \K2, K4 Enter on-line command mode. No break is sent to the remote modem.

\K1 Clears data buffers and sends a break to the remote modem.

\K3 Sends a break to the remote modem immediately.

\K5 Sends a nondestructive, nonexpedited break to the remote modem (default).

The second case, shown in Table 3-37: \K<value> Commands When Modem Is On-Line Command State During Data Connection, occurs when the modem is in the on-line command state (waiting for AT commands) during a data connection, and the \B<value> command is received in order to send a break to the remote modem.

Table 3-37: \K<value> Commands When Modem Is On-Line Command State During Data Connec-

tion

Command Function

\K0, \K1 Clears data buffers and sends a break to the remote modem.

\K2, \K3 Sends a break to the remote modem immediately.

\K4, \K5 Sends a break to the remote modem in sequence with data (default).

Finally, the third case occurs when a break is received from a remote modem during a connection. These commands are shown in Table 3-38: \K<value> Commands When Break Is Received During Connection .

Table 3-38: \K<value> Commands When Break Is Received During Connection

Command Function

\K0, \K1 Clears data buffers and sends a break to the DTE.

\K2, \K3 Sends a break to the DTE immediately.

\K4, \K5 Sends a break to the DTE in sequence with received data (default).

\N<error_control>—Select Error Control Mode

Use this command to select the type of error control used by the modem when sending or receiving data. Result codes:

OK if <error_control> = 0—5, or 7.

ERROR if <error_control> does not equal 0—5, or 7.

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56K Softmodem

Command Reference

Table 3-39: N<value> Commands

Command Function

\N0 Buffer mode. No error control (same as &Q6).

\N1 Direct mode.

\N2 MNP or disconnect mode. The modem attempts to connect using MNP 2—4 error control proce-

dures. If this fails, the modem disconnects. This is also known as MNP reliable mode.

\N3 V.42, MNP, or buffered (default). The modem attempts to connect in V.42 error control mode. If

this fails, it will attempt to connect in MNP mode. If this also fails, the 56K Softmodem in buffer mode and continues operation. This is also known as V.42/MNP auto reliable mode (same as &Q5).

\N4 V.42 or disconnect. The modem attempts to connect in V.42 error control mode. If this fails, the

modem disconnects.

\N5 V.42, MNP, or buffered (same as \N3).

\N7 V.42, MNP, or buffered (same as \N3).

connects

\Q<value>—Local Flow Control Selection

Use this command to set the local flow control method. Result codes:

OK if <value> = 0—1, or 3.

ERROR if <value> does not equal 0—1, or 3.

Table 3-40: \Q<value> Commands

Command Function

\Q0 Disables flow control (same as &K0).

\Q1 XON/XOFF software flow control (same as &K4).

\Q3 RTS/CTS to DTE (same as &K3) (default).

\R<value>—Ring Indicator Signal Off After Answer

This command is supported to ensure compatibility with communications software that issues the \R0 command.

Result codes:

OK if <value> = 0.

ERROR if <value> does not equal 0.

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Table 3-41: \R<value> Commands

Command Functions

\R0 Ring indicator is off after the telephone call is answered.

\T<time delay>—Inactivity Timer

Use this command to specify the delay time used by the inactivity timer. The delay time is the length of time in minutes that the modem waits during periods of inactivity before disconnecting. Periods of inactivity are defined by no data being sent or received by the DCE. To disable the inactivity timer, use the T0 command. The delay time may also be specified in register S30 (see “S30—Inactivity Timer” on page 89).

This function is only applicable in buffer mode.

Result codes:

OK if <time delay> = 0—255.

56K Softmodem

Command Reference

ERROR if <time delay> does not equal 0—255.

Table 3-42: \T<value> Commands

Command Function

\T0 Inactivity timer disabled (default).

\T1—\T255 Specifies the length of time in minutes that the modem will wait

before disconnecting when no data is sent or received.

\V<value>—Protocol Result Code

Use this command to enable or disable protocol result codes. Result codes:

OK if <value> = 0—2.

ERROR if <value> does not equal 0—2.

Table 3-43: \V<value> Commands

Command Function

\V0 Disables protocol result code appended to DCE speed.

\V1 Enables protocol result code appended to DCE speed (default).

\V2 Enables protocol result code appended to DCE speed (same as \V1).

%B—View Numbers in Blacklist

If blacklisting is in effect, this command displays the numbers that are currently

- 30

blacklisted, failed, or delayed. The ERROR result code appears for countries that do not support blacklisting.

%C<value>—Data Compression Control

Use this command to enable or disable V.42 bis and MNP class 5 data compression. On-line changes do not take effect until a disconnect occurs.

Result codes:

OK if <value> = 0—3.

ERROR if <value> does not equal 0—3.

Table 3-44: %C<value> Commands

Command Function

%C0 V.42 bis/MNP 5 disabled. No data compression.

%C1 V.42 bis/MNP 5 enabled. Data compression enabled (default).

56K Softmodem

Command Reference

%C2

%C3

%E<value>—Auto Fallback/Fallforward Control

This command provides the option for the modem to automatically monitor line quality, to fall back when line quality is insufficient, and to fall forward when line quality is sufficient.

Result codes:

OK if <value> = 0—2.

ERROR if <value> does not equal 0—2.

Table 3-45: %E<value> Commands

Command Function

%E0 Disables fallback/fallforward.

%E1 Enables fallback and disable fallforward.

%E2 Enables fallback/fallforward (default).

-C<value>—Data Calling Tone

Use this command to enable or disable the data calling tone after a call is originated. The data calling tone is a tone of a certain frequency and cadence as specified in V.25, which allows remote data/FAX/voice discrimination. The frequency is 1300 Hz with a cadence of 0.5 s on and 2.0 s off.

- 31

Result codes:

56K Softmodem

Command Reference

OK if <value> = 0, 1.

ERROR if <value> does not equal 0, 1.

Table 3-46:

-C<value> Commands

Command Function

-C0 Disabled (default).

-C1 Enabled.

-V90=<rate>—Enable/Disable V.90 Settings

Result codes:

OK if <rate> = 0—23.

ERROR if <rate> does not equal 0—23.

Table 3-47: -V90 Commands

Command Function

-V90=<rate> Controls the downstream rate. See Table 3-48: -V90=<rate> Equivalent Downstream Rates for the possible values of <rate>.

-V90=0 Disables V.90.

-V90=1 Enables V.90 auto rate (default).

-V90? Displays the current value.

-V90=? Shows the range of <rate>.

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56K Softmodem

Command Reference

Table 3-48: -V90=<rate> Equivalent Downstream Rates

<rate> Value Downstream Rate <rate> Value Downstream Rate

0 V.90 disabled. 12 41333 kbits/s.

1 Auto rate (default). 13 42666 kbits/s.

2 28000 kbits/s. 14 44000 kbits/s.

3 29333 kbits/s. 15 45333 kbits/s.

4 30666 kbits/s. 16 46666 kbits/s.

5 32000 kbits/s. 17 48000 kbits/s.

6 33333 kbits/s. 18 49333 kbits/s.

7 34666 kbits/s. 19 50666 kbits/s.

8 36000 kbits/s. 20 52000 kbits/s.

9 37333 kbits/s. 21 53333 kbits/s.

10 38666 kbits/s. 22 54666 kbits/s.

11 40000 kbits/s 23 56000 kbits/s.

+A8E=<v8o>,<v8a>,<v8cf>,<v8b>—V.8 and V.8 bis Operation Controls

Use this command to set the control parameters for early call negotiation through V.8 and V.8 bis. +A8E* may also be used as an action command to reinitiate V.8 or V.8 bis if an earlier attempt to use either protocol has failed.

<v8o> enables or disables DCE-controlled V.8 origination negotiation; <v8a> enables or disables DCE-controlled

V.8 answer negotiation; <v8b> disables V.8 negotiation or sets it to DCE controlled or DTE controlled negotiation. The <a8cf> parameter sets the V.8 CI signal call function to the value specified. The valid range for this parameter is 0— FF, with a default of 0xC1.

Result codes:

OK if <v8o> = 1, 6 and <v8a> = 1, 5 and <v8cf> = 0—FF and <v8b> = 0—2.

ERROR if <v8o> does not equal 1, 6 or <v8a> does not equal 1, 5 or <v8cf> does

not equal 0—FF or <v8b> does not equal 0—2. The following parameter values are supported when V.80 is enabled.

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56K Softmodem

Command Reference

Table 3-49: Valid <v8o> Values

Value Description

1 Enables DCE-controlled V.8 origination negotiation (default).

6 Enables DCE-controlled V.8 origination negotiation, issue +A8x indications.

Table 3-50: Valid <v8a> Values

Value Description

1 Enables DCE-controlled V.8 answer negotiation (default).

5 Enables DCE-controlled V.8 answer negotiation, issue +A8x indications.

Table 3-51: Valid <v8cf> Values

Value Description

1 Enables DCE-controlled V.8 origination negotiation.

6 Enables DCE-controlled V.8 origination negotiation, issue +A8x indications.

Table 3-52: Valid <v8b> Values

Value Description

0 Disables V.8 negotiation.

1 Enables DCE-controlled V8 bis negotiation (default).

2 Enables DTE-controlled V.8 negotiation.

Table 3-53: +A8E Extended Syntax Commands

Command Description

+A8E=<v8o>,<v8a>,<v8cf>,<v8b> Sets the parameters used by the modem during V.8 negotiation.

+A8E? Displays the current settings for V.8 or V.8 bis negotiation.

+A8E=? Displays the supported parameter values for the A8E commands.

Note:* ITU-T recommendation V.251 (02/98) standardized this command. However, the 56K Softmodem

command set only includes partial support for the standard. For complete detail of the standard form of this command, refer to recommendation V.251.

+A8T=<signal>,<1st_message>,<2nd_message>,<sig_en>,<msg_en>,<supp_delay>—Send V.8 bis Signal and/or Message

This command instructs the DCE to send a V.8 bis signal or message. This command is only supported when V.80 is enabled.

- 34

Result codes:

56K Softmodem

Command Reference

OK if <signal> = 0—10 and <sig_en> = 0, 1 and <msg_en> = 0, 1 and <supp_delay> = 0,1.

ERROR if <signal> does not equal 0—10 or <sig_en> does not equal 0, 1 or <msg_en> does not equal 0, 1 or <supp_delay> does not equal 0,1.

Table 3-54: Valid <signal> Values

Value Meaning

0 None.

1 Initiating Mre.

2 Initiating MRd.

3 Initiating CRe, low power.

4 Initiating CRe, high power.

5 Initiating CRd.

6 Initiating Esi.

7 Responding MRd, low power.

8 Responding MRd, high power.

9 Responding CRd.

10 Responding Esr.

Table 3-55: Valid <sig_en> Values

Value Meaning

0 Enables detection of initiation signals (default).

1 Enables detection or responding signals.

Table 3-56: Valid <msg_en> Values

Value Meaning

0 Disables detection of messages (default).

1 Enables detection of V.8 bis messages.

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56K Softmodem

Command Reference

Table 3-57: Valid <supp_delay> Values

Value Meaning

0 No delay inserted (default).

1 Inserts a 1.5 s delay between transmitted V.8 bis signal and the

subsequent V.8 bis message.

+A8T=<signal>,<1st_message>,<2nd_message>,<sig_en>,<msg_en>,<supp_delay >—Send V.8 bis

Table 3-58: +A8T Extended Syntax Commands

Command Description

+A8T=<signal>,<1st_message>, <2nd_message>,<sig_en>,<msg_en>,<supp_delay>

+A8T? Displays the current configuration for sending a V.8

+A8T=? Displays the supported configuration parameters.

Sends a V.8 bis command or message.

bis message or command.

+DR<value>—Data Compression Reporting

Use this command to enable or disable the compression report. If the compression report is enabled, the +DR:<type> intermediate result code reports the current DCE-DCE data compression type. It is issued after the error control report (+ER) and before the final result code (e.g., CONNECT).

Result codes:

OK if <value> = 0, 1.

ERROR if <value> does not equal 0, 1.

Table 3-59: +DR Data Compression Report Value

Command Function

+DR=0 This command disables the compression report.

+DR=1 This command enables the compression report.

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56K Softmodem

Command Reference

Table 3-60: +DR Data Compression Reporting Intermediate Result Codes

Result Code Description

+DR: NONE Data compression is not in use.

+DR: V42B V.42 bis is in use in both directions.

+DR: V42B RD V.42 bis is in use in the receive direction.

+DR: V42B TD V.42 bis is in use in the transmit direction.

+DR: V44 V.44 is in use in both directions.

+DR: V44 RD V.44 is in use in the receive direction.

+DR: V44 TD V.44 is in use in the transmit direction.

Table 3-61: +DR Extended Syntax Commands

Command Description

+DR=<value> Turns the data compression report result code on or off.

+DR? Displays the current status of the data compression report result code.

+DR=? Displays all of the supported values for the <value> parameter.

+DS=<direction>,<compression_negotiation>,<max_dict>,<max_string>—V.42 bis Data Compression

Use the +DS command to configure the V.42 bis data compression method used by the modem. The settings of this command overwrite the setting of a %C<value> command. However, it can also be overwritten by %C<value> command.

Result codes:

OK if <direction> = 0—3 and <compression negotiation> = 0 and <max_dict> = 512, 1024, 2048 and <max_string> = 6—32.

ERROR if <direction> does not equal 0—3 or <compression negotiation> does not equal 0 or <max_dict> does not equal 512, 1024, 2048 or <max_string> does not equal 6—32.

The <direction> parameter sets which directions use the compression method. The 56K Softmodem uses compression in one or both directions.

- 37

56K Softmodem

Command Reference

Table 3-62: Valid <direction> Values

Value Meaning

0 Modem negotiates no V.42 bis compression.

1 Modem negotiates transmit only V.42 bis compression.

2 Modem negotiates receive only V.42 bis decompression.

3 Modem accepts V.42 bis compression in both or either direction (default).

The <compression_negotiation> parameter tells the modem whether it should disconnect if V.42 negotiations fail. The 56K Softmodem AT command set does not support the disconnect feature when V.42 negotiation fails and the <compression_negotiation> parameter is always set to 0. The <max_dict> and <max_string> parameters specify the maximum number of dictionary entries and maximum string length for the modem to negotiate. Their default values are 4096 and 32, respectively.

Table 3-63: +DS Extended Syntax Commands

Command Description

+DS=<direction>,<0>,<max_dict>,<max_string> Configures modem V.42 compression method.

+DS? Displays the current V.42 compression configuration.

+DS=? Displays the supported V.42 compression setting.

+DS44=<direction>,<compression_negotiation>, <capability>, <max_codewords_tx>, <max_codewords_rx>,<max_string_tx>,<max_string_rx>,<max_history_tx>,<m ax_history_rx>— V.44 Data Compression

Use this command to configure the V.44 data compression method used by the modem. The 56K Softmodem never disconnects if V.44 is not negotiated and always use the streaming method for data transfers. As a result, <compression_negotiation> and <capability> are always 0.

+DS44=<direction>,<compression_negotiation>, <capability>, <max_codewords_tx>, <max_codewords_rx>,<max_string_tx>,<max_string_rx>,<max_history_tx>,<m ax_history_rx>

Result codes:

OK if <direction> = 0—3, and <compression_negotiation> = 0, and <capability> = 0, and <max_codewords_tx> = 512, 1024, 2048, and <max_codewords_rx> = 512, 1024, 2048, and <max_history_tx> = 1024, 2048, 4096, 1536, 3072, 6144, and <max_history_rx> = 1024, 2048, 4096, 1536, 3072, 6144.

ERROR if <direction> does not equal 0—3, or <compression_negotiation> does not equal 0, or <capability> does not equal 0, or <max_codewords_tx> does not

- 38

56K Softmodem

Command Reference

equal 512, 1024, 2048, or <max_codewords_rx> does not equal 512, 1024, 2048, or <max_history_tx> does not equal 1024, 2048, 4096, 1536, 3072, 6144, or <max_history_rx> does not equal 1024, 2048, 4096, 1536, 3072, 6144.

The <direction> parameter sets which directions use the compression method. The 56K Softmodem uses compression in one or both directions.

Table 3-64: Valid <direction> Values

Value Meaning

0 Modem negotiates no V.44 compression.

1 Modem negotiates transmit only V.44 compression.

2 Modem negotiates receive only V.44 decompression.

3 Modem accepts compression in both or either direction (default).

The <max_codewords_tx> parameter specifies the maximum number of code words to negotiate in the transmit direction. The <max_codewords_rx> parameter specifies the maximum number of code words to negotiate in the receive direction.

Table 3-65: Valid <max_codewords_tx> and <max_codewords_rx> Values

Value Meaning

2048 Default <max_codewords_tx> and <max_codewords_rx> value.

512, 1024, 2048 Valid transmit and receive code word settings.

The <max_string_tx> parameter specifies the maximum string length to negotiate in the transmit direction. The <max_string_rx> parameter specifies the maximum string length to negotiate in the receive direction.

Table 3-66: Valid <max_string_tx> and <max_string_rx> Values

Value Meaning

255 Default <max_string_tx> and <max_string_rx> value.

32—255 Valid transmit and receive string lengths.

+DS44=<direction>,<compression_negotiation>, <capability>, <max_codewords_tx>,

<max_codewords_rx>,<max_string_tx>,<max_string_rx>,<max_history_tx>,<m ax_history_rx>—

The <max_history_tx> parameter specifies the maximum length of the history buffer to negotiate in the transmit direction. The <max_history_rx> parameter specifies the maximum length of the history buffer to negotiate in the receive direction.

- 39

56K Softmodem

Command Reference

Table 3-67: Valid <max_history_tx> and <max_history_rx> Values

Value Meaning

6144 Default <max_history_tx> and <max_history_rx> value.

1024, 2048, 4096, 1536, 3072, 6144 Valid maximum transmit and receive history buffer sizes.

Table 3-68: +DS44 Extended Syntax Commands

Command Description

+DS44=<direction>,<0>,<0><max_code_ words_tx>,<max_code_words_rx>,<max_ string_tx>,<max_string_tx>,<max_sting_rx>, <max_history_tx>,<max_history_rx>

+DS44? Displays the current V.44 compression configuration.

+DS44=? Displays the supported V.44 compression setting.

Configures modem V.44 compression method.

+EB=<break_selection>,<timed>,<default_length>—Break Handling In Error Control Operation

Use this command to set the modem behavior when a BREAK is received. The <break_selection> parameter sets the type of break sent to the remote DCE when a break is received from the local DTE. The <timed> parameter sets whether the V.42 L-SIGNAL sends the break length. The <default_length> parameter sets the length of the break sent to the local DTE when the modem receives a break from the remote DTE that does not have a defined break length. The <default_length> is defined in milliseconds and has a default value of 30 (30 ms).

Result codes:

OK if <break_selection> = 0—3 and <timed> = 0, 1 and <default_length> = 0— 255 in increments of 10.

ERROR if <break_selection> does not equal 0—3 or <timed> does not equal 0, 1 or <default_length> does not equal 0—255 in increments of 10.

Table 3-69: Valid <break_selection> Values

0 Ignore break (default).

1 Non expedited, nondestructive.

2 Expedited, nondestructive.

3 Expedited, destructive.

Note:* ITU-T recommendation V.250 (05/98) standardized this command. The standard version includes

two additional parameters that are not included in the 56K Softmodem command set. For more infor-

Value Meaning

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56K Softmodem

Command Reference

mation on the standardized version of this command, refer to ITU-T recommendation V.250.

Table 3-70:

Valid <timed> Values

Value Meaning

0 V.42 L-SIGNAL does not indicate break signal length.

1 V.42 L-SIGNAL indicates break signal length.

Table 3-71: Valid <default_length> Values

Value Meaning

0 Modem does not deliver a break to the DTE.

1—255 Modem delivers a break of the length set by the <default_length> parameter.

Table 3-72: +EB Extended Syntax Commands

Command Description

+EB=<break selection>,<timed>, <default length> Sets the modem behavior when a break is received.

+EB? Displays the current break selection settings.

+EB=? Displays the supported break selection settings.

+EFRAM=<value 1>,<value 2>—Frame Length

Use this command to set the maximum link-layer frame information field size that the 56K Softmodem attempts to establish. <value 1> defines the field size for the sending direction in octets. <value 2> defines the field size for the receiving direction in octets and is not required.

Result codes:

OK if <value 1> = 8, 16, 32, 64, 128, 256 and <value 2> = 0

ERROR if <value 1> does not equal 8, 16, 32, 64, 128, 256 or <value 2> does not

equal 0

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56K Softmodem

Command Reference

Table 3-73: +EFRAM Extended Syntax Commands

Command Description

+EFRAM=<value 1>,<value 2> Sets the link-layer frame fields size.

+EFRAM? Displays the current maximum link-layer frame field size settings.

+EFRAM=? Displays the supported maximum frame sizes.

+ER=<value>—Error Control Reporting

Use this command to turn on or turn off the error control report. If the compression report is enabled, the +ER:<type> intermediate result code reports the current DCE-DCE error control type. It is issued after the determination of the error control protocol and before the final result code (e.g., CONNECT). Specifically, the +ER intermediate result code is issued after the modulation report (+MCR and +MRR) and before the data compression report (+DR).

Result codes:

OK if <value> = 0, 1.

ERROR if <value> does not equal 0, 1.

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56K Softmodem

Command Reference

Table 3-74: +ER Control Reporting Commands

Command Function

+ER=0 This command enables error control report (default).

+ER=1 This command disables error control report.

Table 3-75: +ER Error Control Reporting Intermediate Result Codes

Result Code Description

+ER: NONE Data compression not in use.

+ER: LAPM V.42 LAPM protocol is in use.

+ER: ALT V.42 alternative protocol is in use.

Table 3-76: +ER Extended Syntax Commands

Command Description

+ER=<value> Enables or disables error control reporting.

+ER? Displays the current setting for error control reporting.

+ER=? Displays the supported error control reporting settings (0, 1).

+ES=<orig_rqst>,<orig_fbk>,<ans_fbk>—Error Control Selection

Use this command to select the error correction mode. If the modem is operated in V.80 mode (synchronous buffered mode), and +ES=,,8, the +ES? will always return +ES: 6,,8. The setting of this command overwrites the \N command. However, the +ES command is overwritten by the setting on a \N command.

Result codes:

OK if one of the combinations shown in Table 3-77: +ES Combinations.

ERROR all other parameter combinations.

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Command Reference

Table 3-77: +ES Combinations

Combination Mode

+ES=1,0,1 Buffered mode.

+ES=0,1,0 Direct mode.

+ES=4,4,6 MNP or disconnect mode.

+ES=3,3,5 LAPM or disconnect mode.

+ES=4,0,6 MNP or buffered mode.

+ES=3,0,2 LAPM, MNP, or buffered mode (default).

+ES=2,0,2 LAPM or buffered mode.

+ES=3,2,4 LAPM, MNP, or disconnect mode.

+ES=,,8 V.42 sync buffer mode (V.80 enabled).

+ES=6,,8 V.42 sync buffer mode (V.80 enabled).

56K Softmodem

Table 3-78: +ES Extended Syntax Commands

Command Description

+ES=<value> Selects the modem error control method.

+ES? Displays the current error control settings.

+ES=? Displays the supported error control settings.

+ESR=<value>—Selective Repeat

Use this command to enable or disable the selective reject mode*. Result codes:

OK if <value> = 0, 1.

ERROR if <value> does not equal 0, 1.

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56K Softmodem

Command Reference

Table 3-79: +ESR Parameter Values

Command Description

0 Enables the selective reject mode.

1 Disables the selective reject mode.

Table 3-80: +ESR Extended Syntax Commands

Command Description

+ESR=<value> Turns on or turns off the selective reject mode.

+ESR? Displays the current settings for the selective reject mode.

+ESR=? Displays the supported settings for the selective reject mode.

Note:* Refer to ITU- T recommendation V.42 for a complete definition of the selective reject mode.

+ETBM=<pending_TD>,<pending_RD>,<timer>—Call Termination Buffer Management

Result codes:

Use this command to set the behavior of the modem during call termination. The <pending_TD> parameter controls how previously transmitted data remaining in the DCE buffers is handled when the DTE request a disconnect from the call. The <pending_RD> parameter controls how previously received data remaining in the DCE buffers is handled when the remote DCE disconnects the call. The <timer> parameter sets the maximum amount of time the 56K Softmodem will attempt to deliver the buffered data before abandoning the attempt and discarding any remaining data.

OK if <pending_TD> = 0—2 and <pending RD> = 0—2 and <timer> = 0—254.

ERROR if <pending_TD> does not equal 0—2 or <pending RD> does not equal

0—2 or <timer> does not equal 0—254.

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56K Softmodem

Command Reference

Table 3-81: <pending_TD> Parameter Values

Value Description

0 Modem discards all buffered data immediately and disconnects.

1 Modem ignores the timer and attempts to deliver the data until it is acknowledged. If the

remote DCE disconnects, discard the remaining data.

2 Modem attempts to deliver the data until the data is acknowledged. If the remote DCE

disconnects, or the timer expires, discard the remaining data.

Table 3-82: <pending_RD> Parameter Values

Value Description

0 Modem discards all buffered data immediately and disconnects.

1 Modem ignores the timer and attempts to deliver the data until it is acknowledged. If

the local DTE request a disconnect, discard the remaining data.

2 Modem attempts to deliver the data until the data is acknowledged. If the local DTE

request a disconnect, or the timer expires, discard the remaining data.

Table 3-83: <timer> Parameter Values

Value Description

0 Modem does not attempt to deliver data.

1—254 Modem attempts to deliver data for the amount of time set by the <timer> parameter.

Table 3-84: +ETBM Extended Syntax Commands

Command Description

+ETBM=<pending_TD>,<pending_RD>,<timer> Sets the modem behavior during call termination.

+ETBM? Displays the current settings for call termination behavior.

+ETBM=? Displays the supported settings for call termination behavior.

+EWIND=<value_1>,<value_2>—Window Size

Use this command to set the maximum number of acknowledged frames allowed at the link layer. Changes set by the command take effect when the next connection is established. <value_1> sets the maximum window size for the transmit direction and <value_2> sets the maximum window size for the receive direction. The default value for <value_1> is 15.

Result codes:

OK if <value_1> = 1—31 and <value_2> = 0.

ERROR if <value_1> does not equal 1—31 or <value_2> does not equal 0.

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Command Reference

Table 3-85: +EWIND Extended Syntax Commands

Command Description

+EWIND=<value_1>,<value_2> Sets the maximum link-layer window size.

+EWIND? Displays the current maximum link-layer window size.

+EWIND=? Displays the supported maximum link-layer window sizes.

+FCLASS=<value>—Service Class Indication

Use this command to set the modem service class. The service class determines if the modem is in data, FAX. The +FCLASS command is an extended syntax command.

Result codes:

OK if <value> = 0, 1.

ERROR <value> does not equal 0, 1.

56K Softmodem

Table 3-86: +FCLASS Values

Commands Description

+FCLASS=0 Selects the modems data mode.

+FCLASS=1 Selects the modems class 1 fax mode.

Table 3-87: +FCLASS Extended Syntax Commands

Command Description

+FCLASS=<value> Selects the class or mode of the modem.

+FCLASS? Displays the current class or mode.

+FCLASS=? Displays the available parameter values for the +FCLASS command.

+GCAP—Request Complete Capabilities List

Use this command to display a list of the 56K Softmodem’s capabilities. This is an extended syntax command, but it has only one form, +GCAP.

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56K Softmodem

Command Reference

Table 3-88: +GCAP Responses

+GCAP Responses* DCE Control Standard Description

+FCLASS T.class 1, +F Class 1 FAX DCE control

+MS +M commands Modulation control: • +MS • +MR

+ES +E commands Error control: • +ES • +EB • +ER •

+EFCS • +ETBM

+DS +D commands Data compression • +DS • +DR

Note:* ITU-T recommendation V.250 (05/99) identifies an additional response (+MV18S) that is not

included with the 56K Softmodem. +MV18S is for V.18 modulation control. For more information refer to ITU-T recommendation V.250 (05/99).

+GCI=<T.35_country_code>—Country of Installation

Use this command to set the modem country code. ITU-T Recommendation T.35 defines the country codes and the country names. Table 158 on page 82 has a complete list of the T.35 country codes.

Result codes:

OK if <T.35_country_code> = valid country code as defined by Table 158.

ERROR if <T.35_country_code> does not equal valid country code as defined by

Table 158.

Table 3-89: +GCI Extended Syntax Commands

Command Description

+GCI=<T.35_country_code> Set the country code.

+GCI? Display the current country code setting.

+GCI=? Display all supported country code settings.

+GMI—Manufacturer Identification

+GMI is an extended syntax command. It returns the modem manufacturer and either the OK or ERROR result code. The +GMI=? syntax returns an ERROR result code. The other two forms return an OK result code.

Result codes:

OK when using the +GMI or +GMI? syntax.

ERROR when using the +GMI=? syntax.

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56K Softmodem

Command Reference

Table 3-90: +GMI Extended Syntax Commands

Command Description

+GMI, +GMI? Display modem manufacturer and generates an OK result code.

+GMI=? Display modem manufacturer and generates an ERROR result code.

+GMM—Modem Identification

This command is supported to ensure compatibility with communication software that issues the +GMM command. The +GMM command returns the string "H.324 video ready rev 1.0."

Result codes:

OK when using the +GMM or +GMM? syntax.

ERROR when using the +GMM=? syntax.

Table 3-91: +GMM Extended Syntax Commands*

Command Description

+GMM, +GMM? Displays "H.324 video ready rev. 1.0"

Note:* ITU-T recommendation V.250 standardized this command. The standard version did not include the

extended syntax version included with the 56K Softmodem version of the +GMM commands. For more information, see recommendation V.250.

+GMR—Request Revision Information

This command returns the version of the modem code. Result codes:

OK when using the +GMR or +GMR? syntax.

ERROR when using the +GMR=? syntax.

Table 3-92: +GMR Extended Syntax Commands

Command Description

+GMR, +GMR? Displays the version and revision information followed by the OK result code.

+GMR=? Displays the version and revision information followed by the ERROR result code.

+GOI—Request Global Object Identification

This command returns the ISO registration object identifier. Result codes:

OK when using the +GOI syntax.

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56K Softmodem

Command Reference

ERROR when using the +GOI=? or +GOI? syntax.

Table 3-93: +GOI Extended Syntax Commands

Command Description

+GOI Displays the ISO registration object identifier followed by the OK result code.

+GOI=?, +GOI? Displays the ISO registration object identifier followed by the ERROR result code.

+GSN—Request Product Serial Number Identification

This command returns the product serial number. Result codes:

OK when using the +GSN syntax.

ERROR when using the +GSN=? or +GSN? syntax.

Table 3-94: +GSN Extended Syntax Commands

Command Description

+GSN Displays the product serial number followed by the OK result code.

+GSN=?, +GSN? Displays the product serial number followed by the ERROR result code.

+IDSR=<value>—Select Data Set Ready Option

Use this command to select how the 56K Softmodem manages the DSR signal (V.24 circuit 107). Result codes:

OK if <value> = 0, 1.

ERROR if <value> 0, 1.

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Command Reference

Table 3-95: +IDSR Values

Commands Description

+IDSR=0 DSR is always on.

+IDSR=1 DSR functions as defined in ITU-T recommendation V.24.

Table 3-96: +IDSR Extended Syntax Commands

Command Description

+IDSR=<value> Sets how the modem manages DSR.

+IDSR? Displays the current parameter value.

+IDSR=? Displays the available parameter values for the +IDSR command.

+IFC=<DCE_by_DTE>, <DTE_by_DCE>—DTE-DCE Local Flow Control

Use this command to select the local flow control method. The input parameters of the +IFC command overwrite the settings of the \Q and \X<value> commands. The reverse is also true. By modifying the settings of the \Q and \X<value> commands, the +IFC command parameters are overwritten.

56K Softmodem

Result codes:

OK if <DCE by DTE> = 0—3 and <DTE by DCE> = 0—2.

ERROR if <DCE by DTE> does not equal 0—3 or <DTE by DCE> does not equal

0—2. The following combinations are accepted by the modem.

Table 3-97: +IFC Commands

Command Data Format

+IFC=0,0 No flow control.

+IFC=1,1 Software flow control.

+IFC=2,2 Hardware flow control (default).

+IFC=3,1 Software flow control with XON/OFF characters passed on to

the remote DCE.

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56K Softmodem

Command Reference

Table 3-98: +IFC Extended Syntax Commands

Command Description

+IFC=<DCE by DTE>,<DTE by DCE> Sets the local flow control method.

+IFC? Displays the current local flow control settings.

+IFC=? Displays the supported local flow control parameter settings.

+ILRR=<value>—DTE-DCE Local Rate Reporting

Use this command to display or hide the local rate report result code. If the rate report is enabled, the reported <rate> is the current DTE-DCE rate. The rate report is an intermediate result code. It is transmitted after any modulation, error control, or data compression reports, and before the final result code (e.g., CONNECT).

Result codes:

OK if <value> = 0, 1.

ERROR if <value> does not equal 0, 1.

Table 3-99: +ILRR Commands

Command Function

+ILRR=0 Disables the local rate report (default).

+ILRR=1 Enables the local rate report.

Table 3-100:

+ILRR Extended Syntax Commands

Command Description

+ILRR=<value> Selects or deselects transmission of the rate report result code.

+ILRR? Displays the current status of the rate report result code.

+ILRR=? Displays the supported parameter values for DTE-DCE local rate reporting.

+IPR=<DTE rate>—Fixed DTE Rate

Use this command to set the DTE to DCE transmission rate. There are twelve fixed transmission rates used by the DTE to communicate with the DCE. This command selects one of the predefined transmission rates. If a rate is entered which is not supported, the transmission rate defaults to the next lower rate.

Result codes:

• OK for all values of <DTE rate>.

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Command Reference

Table 3-101: +IPR Commands

Command DTE Rate

+IPR=0 Automatic rate detection (default).

+IPR=300 300 bits/s.

+IPR=1200 1200bits/s.

+IPR=2400 2400 bits/s.

+IPR=4800 4800 bits/s.

+IPR=9600 9600 bits/s.

+IPR=19200 19200 bits/s

+IPR=38400 38400 bits/s.

+IPR=57600 57600 bits/s.

+IPR=115200 115200 bits/s.

+IPR=230400 230400 bits/s.

56K Softmodem

+IPR=460800 460800 bits/s.

+IPR=921600 921600 bits/s.

Table 3-102: +IPR Extended Syntax Commands

Command Description

+IPR=<DTE rate> Sets the DTE to DCE transmission rate.

+IPR? Displays the current DTE to DCE transmission rate.

+IPR=? Displays all supported transmission rates.

+MA=<carrier 1>,<carrier 2>, ...—Modulation Automode Control

Use this parameter to define a list of modulations that the 56K Softmodem may use to connect with a remote modem for answering or originating automode (automatic modulation negotiation) data calls. The list acts as an extension to the modulation specified by the +MS=<carrier> command. The modulation identified by <carrier> in the +MS command limits the values in the +MA carrier list. Modulations which exceed the rate set by the +MS command (see Table 3-108: Valid <max_rate> Range. Valid <max rate> for each <carrier> for more information), generate an ERROR result code and are not implemented by the 56K Softmodem. <carrier> values omitted from the list are not available for automode negotiation and are not used in automode negotiation even when the modem is capable of generating the modulation.

Result codes:

OK if <carrier x> = V90, V34, V32T, V32B, V32, V22B, V22, Bell212A, V23C, V21, Bell103 and <carrier x> is less than the carrier set by the +MS command.

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ERROR if <carrier x> does not equal V90, V34, V32T, V32B, V32, V22B, V22, Bell212A, V23C, V21, Bell103 or <carrier x> is greater than the carrier set by the

+MS command.

Table 3-103: +MA Extended Syntax Commands

Command Description

+MA=<carrier 1> Defines automode modulation list.

+MA? Displays the current automode modulation list.

+MA=? Displays the all available modulations.

+MR=<value>—Modulation Reporting Control

Use this command to enable or disable modulation report result codes. When the modulation report is enabled, the DCE transmits the +MRR: <rate>, <rx_rate> and the +MCR:<carrier> intermediate result codes to the DTE. The <carrier> reported is the current modulation, for example, V.34. The <rate> reported is the transmit rate in bits per second or is zero if negotiation fails. The <rx_rate> is the receive channel rate and is only reported when different receive and transmit rates have negotiated.

56K Softmodem

Command Reference

Result codes:

The intermediate result codes are transmitted after the modulation and the rate have been determined and before any error control or data compression reports or the final result code (e.g., CONNECT) is transmitted.

OK if <value> = 0, 1.

ERROR if <value> does not equal 0, 1.

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56K Softmodem

Command Reference

Table 3-104: +MR Commands

Command Function

+MR=0 Enables the modulation report (default).

+MR=1 Disables the modulation report.

Table 3-105:

+MR Extended Syntax Commands

Command Description

+MR=<value> Select or deselect transmission of the modulation result codes.

+MR? Display the current status of the modulation report result code.

+MR=? Display the supported parameter values for modulation rate reporting.

+MS=<carrier>,<automode>,<min_rate>,<max_rate>—Modulation Selection

Use this command to set the modem’s modulation, the modulation’s minimum and maximum transmission rate, and the status of automatic modulation negotiation (automode). The <carrier>, <min_rate>, and <max_rate> parameters define the modulation and its minimum and maximum rates.

The <automode> parameter enables or disables automatic modulation negotiation. If a subsequent +MA command is not provided, the automode parameters are constrained by the modulation set by the <carrier> parameter. The +MA command can further restrict the automatic modulation negotiation settings, but it cannot set a modulation that is higher than the modulation set by the +MS command.

Result codes:

OK if <automode> = 0, 1 and <min_rate> = 0, 300—57333, and <max_rate> = 0, 300—57333, and carrier is equal to one of the entries in Table 3-106: Valid <carrier> Values.

ERROR if <automode> does not equal 0, 1 or <min_rate> does not equal 0, 300—57333, or <max_rate> does not equal 0, 300—57333, or carrier is not equal to one of the entries in Table 3-106: Valid <carrier> Values.

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Command Reference

Table 3-106: Valid <carrier> Values

Value Meaning

V92 V.92 (default)

V90 V.90

V34 V.34

V32T V.32ter

V32B V.32 bis

V32 V.32

V22B V.22 bis

V.22 V.22

Bell212A Bell 212A*

V23C V.23, constant carrier, asymmetric FDM

V21 V21

56K Softmodem

Bell103 Bell 103*

Note:* The +MS command was standardized by ITU-T recommendation V.250. However, the standard

command does not include the additional functionality provided by the Bell212A and Bell103 values of the <carrier> parameter. Refer to ITU-T recommendation V.250 for information regarding the standard command format.

Automatic modulation negotiation is enabled or disabled by <automode>. However, if a value is specified for the <max_rate>, then automatic rate selection is disabled and the modem will attempt to connect at the specified rate.

Table 3-107: Valid <automode> Values

Value Meaning

0 Disables.

1 Enabled (default).

The <max_rate> specifies the highest connections rate for the DCE.

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56K Softmodem

Command Reference

Table 3-108: Valid <max_rate> Range

Value Meaning

0 Determined by modulation selected in <carrier> (default).

300—57333 Value limited by modulation selected in <carrier>.

Table 3-109: Valid <max_rate> for each <carrier>

Value Meaning

V92 28000 bits/s—57333 bits/s in steps of 1333 bits/s.

V90 28000 bits/s—57333 bits/s in steps of 1333 bits/s.

V34 2400 bits/s—33600 bits/s in steps of 2400 bits/s.

V32bis 4800 bits/s—19200 bits/s in steps of 2400 bits/s.

V32 4800 bits/s—14400 bits/s in steps of 2400 bits/s.

V22bis 2400 bits/s.

V22 2200 bits/s.

V23C, Bell212A 1200 bits/s.

V.21, Bell103 300 bits/s.

Table 3-110: +MS Extended Syntax Commands

Command Description

+MS=<carrier>,<automode>, <min_rate>,<max_rate>

+MS? Display the current status of the rate report result code.

+MS=? Display the supported parameter values for DTE-DCE local

Select or deselect transmission of the rate report result code.

rate reporting.

Once a modulation is selected by the +MS command, the autorate in both directions and the automode will be activated unless <max_rate> is specified by the same command.

The settings of this command overwrite the settings of S28, S37, S38, S109. Likewise, changes to these registers overwrite the settings of the +MS command.

+MSC=<src_v34>—Seamless Rate Change Enable

Use this command to enable or disable V.34 seamless rate changes. Result codes:

OK if <src_v34> = 0, 1.

ERROR if <src_v34> does not equal 0, 1.

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56K Softmodem

Command Reference

Table 3-111: +MSC Commands

Command Function

+MSC=0 Disables V.34 seamless rate change.

+MSC=1 Enables V.34 seamless rate change (default).

Table 3-112: +MSC Extended Syntax Commands

Command Description

+MSC=<value> Enable or disable V.34 seamless rate changes.

+MSC? Display the current status of the V.34 seamless rate change parameter.

+MSC=? Display the supported parameter values seamless rate change (0, 1).

+PCW=<call_waiting>—Call Waiting Enable

Use this command to select how the modem responds to a call waiting signal. The 56K Softmodem’s response is also dependent on the current setting of the caller ID command, +VCID (see “+VCID=<value>—Caller ID” on page 60).

Result codes:

OK if <call_waiting> = 0—2.

ERROR if <call_waiting> does not equal 0—2.

Table 3-113: Valid <call_waiting> Values

Value Meaning

0 Enable the call waiting detector. When a call waiting signal is detected, toggle V.24 circuit 125

and collect caller ID as set by +VCID (default).

1 Enable the call waiting detector. When a call waiting signal is detected, hang up the current

call.

2 Disable call waiting detector.

Table 3-114: +PCW Extended Syntax Commands

Command Meaning

+PCW=<call_waiting> Enable or disable call waiting.

+PCW? Display the current call waiting configuration.

+PCW=? Display the supported <call_waiting> parameter values.

+PIG=<value>—PCM Upstream Ignore

Use this command to enable or disable PCM upstream in a V.92 connection.

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56K Softmodem

Command Reference

Result codes:

OK if <value> = 0, 1.

ERROR if <value> does not equal 0, 1.

Table 3-115: Valid +PIG Commands

Command Meaning

+PIG=0 Enable PCM upstream.

+PIG=1 Disable PCM upstream (default).

Table 3-116: +PIG Extended Syntax Commands

Value Meaning

+PIG=<value> Enable or disable PCM upstream.

+PIG? Display the current state of the +PIG command.

+PIG=? Display the supported +PIG parameter values.

+PMH=<value>—Modem On Hold Enable

Use this command to enable or disable modem on hold. Note, that the +PMH command does not effect the parameters of the +PMHT (see “+PMHT=<value>— Modem On Hold Timer” on page 59) command. The +PMH command only enables or disables modem on hold. The +PMHT command configures the modem to deny a modem on hold request or grant a modem on hold request with the selected hold time.

Result codes:

OK if <value> = 0, 1

ERROR if <value> does not equal 0, 1

- 59

Table 3-117: Valid +PMH Parameter Values

Value Meaning

+PMH=0 Enables modem on hold ( default).

+PMH=1 Disables modem on hold.

Table 3-118: +PMH Extended Syntax Commands

Value Meaning

+PMH=<value> Enable or disable modem on hold.

+PMH? Display the current state of the +PMH command.

+PMH=? Display the supported +PMH parameter values.

+PMHF—Modem On Hold Hook Flash

Use this command to generate a hook flash during modem on hold operations. The command causes the modem to go on-hook for a period of time set by S29 (see “S29—Flash Dial Modifier Duration” on page 89). Then the modem returns to the off-hook state for at least 1.5 s.

56K Softmodem

Command Reference

Result codes:

• ERROR if the modem is not on hold when the command is executed.

+PMHR—Initiate Modem On Hold

Use this command to initiate a modem on hold request. Once the local modem receives this request from the user or controlling application, the 56K Softmodem requests that the remote modem go on hold. The remote modem either denies the request or grants the request. If the request is granted, the remote modem initialized the modem on hold timer and informs the local modem what the length of the hold duration is. If the request is denied, the local modem generates an ERROR result code and hangs up the line.

The +PMHR command does not have any extended syntax command forms.

Result codes:

OK if the modem on hold request is granted.

ERROR if the modem on hold request is denied or modem on hold is not enabled.

+PMHT=<value>—Modem On Hold Timer

Use this command to configure the 56K Softmodem to grant or reject a modem on hold request. This command configures the modem so it can respond to a modem on hold request. The command must be executed prior to reception of a modem on hold request. If a modem on hold request is made prior to execution of the

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Result codes:

+PMHT=0 Deny modem on hold request (default).

+PMHT=1 Grant modem on hold request with a 10 s time-out.

+PMHT=2 Grant modem on hold request with a 20 s time-out.

56K Softmodem

Command Reference

+PMHT command, by default, the modem on hold request is denied.

This command also sets the modem on hold timer. The modem on hold timer sets the amount of time the modem will remain on hold waiting for the requesting modem to return to the line. If the timer expires, the 56K Softmodem will hang up the call.

OK if <value> = 0—13.

ERROR if <value> does not equal 0—13.

Table 3-119: Valid +PMHT Commands

Command Meaning

+PMHT=3 Grant modem on hold request with a 30 s time-out.

+PMHT=4 Grant modem on hold request with a 40 s time-out.

+PMHT=5 Grant modem on hold request with a 1 min. time-out.

+PMHT=6 Grant modem on hold request with a 2 min. time-out.

+PMHT=7 Grant modem on hold request with a 3 min. time-out.

+PMHT=8 Grant modem on hold request with a 4 min. time-out.

+PMHT=9 Grant modem on hold request with a 6 min. time-out.

+PMHT=10 Grant modem on hold request with a 8 min. time-out.

+PMHT=11 Grant modem on hold request with a 12 min. time-out.

+PMHT=12 Grant modem on hold request with a 16 min. time-out.

+PMHT=13 Grant modem on hold request with an indefinite time-out.

- 61

56K Softmodem

Command Reference

Table 3-120: +PMHT Extended Syntax Commands

Value Meaning

+PMHT=<value>

+PMHT? Display the current modem on hold settings.

+PMHT=? Display the valid +PMHT parameter values.

Configure the 56K Softmodem response to a modem on hold request.

+VCID=<value>—Caller ID

Use this command to enable or disable caller ID. Result codes:

OK if <value> = 0—2.

ERROR if <value> = 0—2.

Table 3-121: Valid +VCID Commands

Command Meaning

+VCID=0 Disable caller ID.

+VCID=1 Enable caller ID with formatted presentation.

+VCID=2 Enable caller ID without formatting.

Table 3-122: +VCID Extended Syntax Commands

Value Meaning

+VCID=<value> Configure caller ID.

+VCID? Display current caller ID settings.

+VCID=? Display all valid +VCID parameter values.

- 62

Fax Commands

FAX Commands

The 56K Softmodem supports FAX commands conforming to EIA* standard 578 and ITU-T recommendation T.31 (08/95) which outlines class 1 asynchronous facsimile under DCE control.

The nature of FAX communication is for a facsimile machine to transmit a graphic image to a receiving facsimile machine. As a result, most of the commands in this section are not designed for interaction with an end user.

The commands still generate a result code to acknowledge reception and the action taken on a command. However in many cases, the command will generate an ERROR result code if it is not connected to a sending or receiving facsimile device.

56K Softmodem

Command Reference

+FAA=<value>—Adaptive Answer

A service class 1 FAX DCE may have the ability to answer as a data modem DCE or as a FAX DCE. It may also be able to change from class 1 FAX mode to data modem operation in response to an incoming call.

Note: This command controls automatic switching from class 1 to class 0 for call answering only. It does not affect call origination, switching to class 1 from other classes, or switching to classes other than class 0.

OK if <value> = 0, 1.

ERROR if <value> does not equal 0, 1.

- 61

56K Softmodem

Command Reference

Table 4-1: +FAA Commands

Command Function

+FAA=0 The DCE will answer only as a class 1 FAX device. No automatic switching of service class will occur

based on the calling device type (default).

+FAA=1 The DCE can answer and automatically determine whether to answer as a facsimile DCE or as a data

modem.

Table 4-2: +FAA Extended Syntax Commands

Command Description

+FAA=<value> Enables or disables adaptive answer.

+FAA? Display the current setting for adaptive answer.

+FAA=? Display the available parameter values for the +FAA command.

+FCLASS=1—Enter Class 1 FAX Mode

The +FCLASS=1 command (see “+FCLASS=<value>—Service Class Indication” on page 46) puts the modem in class 1 FAX mode.

* EIA is a registered trademark of Electronics Industries Association.

+FMI?—Manufacturer Identification

This command returns the manufacturer identification information.

Table 4-3: +FMI Extended Syntax

Command Description

+FMI, +FMI? Displays the modem manufacturer identification.

+FMM?—Product Identification

This command returns the following result:

Data/FAX. Result codes:

This command always yields an OK result code.

- 62

Table 4-4: +FMM Extended Syntax

Command Description

+FMM, +FMM? Displays the modem product identification.

+FMR?—Version/Revision Information

This command returns the modem version code. Result codes:

•

This command always yields an OK result code.

Table 4-5: +FMR Extended Syntax

Command Description

+FMR, +FMR? Displays the modem product identification.

+FPR=<value>—Select FAX Port Rate

56K Softmodem

Command Reference

This command sets the DTE to DCE FAX port rate. The +FPR command is supported to ensure compatibility with communications software that issues the this command.The 56K Softmodem does not maintain the traditional relationship between the DTE and DCE that this command was designed to control. The 56K Softmodem interfaces with the host system via a PCI or AC97 interface.

Result codes:

• This command always yields and OK result code.

Table 4-6: +FPR Commands

DTE Command* Description

+FPR=0 Select automatic rate detection.

+FPR=1 Set DTE-DCE to 2400 bits/s.

+FPR=2 Set DTE-DCE to 4800 bits/s.

+FPR=4 Set DTE-DCE to 9600 bits/s.

+FPR=8 Set DTE-DCE to 19200 bits/s.

+FPR=10 Set DTE-DCE to 38400 bits/s.

+FPR=18 Set DTE-DCE to 57600 bits/s.

* The listed values do not have any significance for the 56K Softmodem. The values listed here are only useful in controller based systems.

- 63

56K Softmodem

Command Reference

Table 4-7: +FPR Extended Syntax

DTE Command Description

+FPR=<value> Does not perform any particular action in soft modem based systems.

+FPR? Does not perform any particular action in soft modem based systems.

+FRH=<mod>—Receive HDLC Data with <mod> Carrier

Use the +FRH command to instruct the modem to receive data framed in the HDLC protocol at the modulation defined by Table 4-8: +FRH Commands on page

65.

Result codes:

CONNECT if <mod> = 3, 24, 48, 72—74, 96—98, 121, 122, 145, 146 and the connection is established. This is an intermediate result code.

OK if <mod> = 3, 24, 48, 72—74, 96—98, 121, 122, 145, 146 and the connection is established. This is a final result code.

ERROR if <mod> does not equal 3, 24, 48, 72—74, 96—98, 121, 122, 145, 146 or the connection is not established. This is a final result code.

- 64

56K Softmodem

Command Reference

Table 4-8: +FRH Commands

Command Modulation Speed

+FRH=3 V.21 channel 2. 300 bits/s.

+FRH=24 V.27ter. 2400 bits/s.

+FRH=48 V.27ter. 4800 bits/s.

+FRH=72 V.29. 7200 bits/s.

+FRH=96 V.29. 9600 bits/s.

+FRH=73 V.17. 7200 bits/s.

+FRH=74 V.17 (short train). 7200 bits/s.

+FRH=97 V.17. 9600 bits/s.

+FRH=98 V.17 (short train). 9600 bits/s.

+FRH=121 V.17. 12000 bits/s.

+FRH=122 V.17 (short train). 12000 bits/s.

+FRH=145 V.17. 14400 bits/s.

+FRH=146 V.17 (short train). 14400 bits/s.

Table 4-9: +FRH Extended Syntax Commands

Command Description

+FRH=<mod> Sets the FAX receive rate and frames the data using HDLC protocol.

+FRH=? Displays all available parameter values for the +FRH command.

+FRM=<mod>—Receive Data

Use the +FRM command to instruct the modem to received data using the modulation defined by Table 4-10: +FRM Commands on page 66.

CONNECT if <mod> = 3, 24, 48, 72—74, 96—98, 121, 122, 145, 146 and

the connection is established. This is an intermediate result code.

OK if <mod> = 3, 24, 48, 72—74, 96—98, 121, 122, 145, 146 and the

connection is established. This is a final result code.

ERROR if <mod> does not equal 3, 24, 48, 72—74, 96—98, 121, 122,

145, 146 or the connection is not established. This is a final result code.

- 65

56K Softmodem

Command Reference

Table 4-10: +FRM Commands

Command Modulation Speed

+FRM=3 V.21 channel 2. 300 bits/s.

+FRM=24 V.27ter. 2400 bits/s.

+FRM=48 V.27ter. 4800 bits/s.

+FRM=72 V.29. 7200 bits/s.

+FRM=96 V.29. 9600 bits/s.

+FRM=73 V.17. 7200 bits/s.

+FRM=74 V.17 (short train). 7200 bits/s.

+FRM=97 V.17. 9600 bits/s.

+FRM=98 V.17 (short train). 9600 bits/s.

+FRM=121 V.17. 12000 bits/s.

+FRM=122 V.17 (short train). 12000 bits/s.

+FRM=145 V.17. 14400 bits/s.

+FRM=146 V.17 (short train). 14400 bits/s.

Table 4-11: +FRM Extended Syntax Commands

Command Description

+FRM=<mod> Sets the FAX receive rate.

+FRM=? Displays all available parameter values for the

+FRM command.

+FRS=<value>—Receive Silence

+FRS=<value> causes the modem to listen and wait for <value> x 10 ms of silence to be detected on the line. For example, <value> = 5 results in a 50 ms interval. At the end of this period, the modem responds with the OK result code. <value> has a range of 0—255.

Result codes:

OK if <value> = 0—255.

ERROR if <value> does not equal 0—255.

+FTH=<mod>—Transmit HDLC Data with <mod> Carrier

The +FTH=<mod> command causes the modem to transmit data framed in the HDLC protocol at the modulation defined by Table 4-12: +FTH Commands on page 67.

- 66

Command Reference

Result codes:

CONNECT if <mod> = 3, 24, 48, 72—74, 96—98, 121, 122, 145, 146 and

the connection is established. This is an intermediate result code.

OK if <mod> = 3, 24, 48, 72—74, 96—98, 121, 122, 145, 146 and the

connection is established. This is a final result code.

ERROR if <mod> does not equal 3, 24, 48, 72—74, 96—98, 121, 122,

145, 146 or the connection is not established. This is a final result code.

Table 4-12: +FTH Commands

Command Modulation Speed

+FTH=3 V.21 channel 2. 300 bits/s.

+FTH=24 V.27ter. 2400 bits/s.

+FTH=48 V.27ter. 4800 bits/s.

+FTH=72 V.29. 7200 bits/s.

56K Softmodem

+FTH=96 V.29. 9600 bits/s.

+FTH=73 V.17. 7200 bits/s.

+FTH=74 V.17 (short train). 7200 bits/s.

+FTH=97 V.17. 9600 bits/s.

+FTH=98 V.17 (short train). 9600 bits/s.

+FTH=121 V.17. 12000 bits/s.

+FTH=122 V.17 (short train). 12000 bits/s.

+FTH=145 V.17. 14400 bits/s.

+FTH=146 V.17 (short train). 14400 bits/s.

Table 4-13: +FTH Extended Syntax Commands

Command Description

+FTH=<mod> Sets the FAX transmit rate and frames the data using HDLC protocol.

+FTH=? Displays all available parameter values for the +FTH command.

+FTM=<mod>—Transmit FAX Data with <mod> Carrier

+FTM=<mod> command causes the modem to transmit data using the modulation defined by Table 4-14: +FTM Commands on page 68.

Result codes:

the connection is established. This is an intermediate result code.

CONNECT if <mod> = 3, 24, 48, 72—74, 96—98, 121, 122, 145, 146 and

- 67

56K Softmodem

Command Reference

OK if <mod> = 3, 24, 48, 72—74, 96—98, 121, 122, 145, 146 and the

connection is established. This is a final result code.

ERROR if <mod> does not equal 3, 24, 48, 72—74, 96—98, 121, 122,

145, 146 or the connection is not established. This is a final result code.

Table 4-14: +FTM Commands

Command Modulation Speed

+FTM=3 V.21 channel 2. 300 bits/s.

+FTM=24 V.27ter. 2400 bits/s.

+FTM=48 V.27ter. 4800 bits/s.

+FTM=72 V.29. 7200 bits/s.

+FTM=96 V.29. 9600 bits/s.

+FTM=73 V.17. 7200 bits/s.

+FTM=74 V.17 (short train). 7200 bits/s.

+FTM=97 V.17. 9600 bits/s.

+FTM=98 V.17 (short train). 9600 bits/s.

+FTM=121 V.17. 12000 bits/s.

+FTM=122 V.17 (short train). 12000 bits/s.

+FTM=145 V.17. 14400 bits/s.

+FTM=146 V.17 (short train). 14400 bits/s.

Table 4-15: +FTM Extended Syntax Commands

Command Description

+FTM=<mod> Sets FAX transmit rate.

+FTM=? Displays all available para meter values for the +FTM command.

+FTS=<value>—Transmission Silence

+FTS=<value> causes the modem to terminate a transmission and wait for <value> x 10 ms before responding with the OK result code. For example, <value> = 5 results in a 50 ms interval. <value> has a range of 0—255.

Result codes:

OK if <value> = 0—255.

ERROR if <value> does not equal 0—255.

- 68

Test and Debug AT Command

The following command is used for testing and debugging only. It is not meant for general use.

#UD—Unimodem Diagnostics

This command is defined by Microsoft ’s* unimodem diagnostics command specification. The 56K Softmodem implements a subset of the parameters in that specification.

#UD is an action command. It does not take parameters. It should be the last command in the command line. The modem logs aspects of its operation for each call and saves these results in volatile memory until cleared by one of the following events. These results are not cleared by changing DTR, V.24 circuit

108.2, &D0, &D1, or &D2.

Power off (or D1 or D3 state entered).

Hard reset (e.g., negate DTR with &D3 set, reset button).

56K Softmodem

Command Reference

Soft reset = ATZ or AT&F.

ATD or ATA command issued.

Automatic answer (e.g., set register S0 > 0 and ring detected). In response to this command, the modem reports one or more lines of information text. Information text format is defined in ITU-T recommendation V.253. Each line is both preceded and terminated by a <CR><LF> pair. Note that, as per V.253, CR and LF characters may be changed by writing new values to the contents of registers S2 and S3 respectively. DIAG <token key = value [[key = value [key = value]] . . . > where: DIAG = 5 characters, hexadecimal 44, 49, 41, 47, 20. ’<’ = left angle bracket, hexadecimal 3C. ’=’ = equal sign, hexadecimal 3D. ’>’ = right angle bracket, hexadecimal 3E. token = unique 32-bit hexadecimal string, i.e., 2A4D3263. key = one- or two-digit hexadecimal number. See Table 4-16: #UD Last Call Status Report Format on page 71. value = any string.

Unless otherwise noted, all values are hexadecimal numbers. Any numeric values from tables in ITU-T recommen

dation V.58 are converted to hexadecimal. Multidigit values are reported MSD first. Leading zeros may be deleted. The following table includes all items listed in Microsoft’s specification for the #UD command. The items that have an X in the Implemented column have been implemented in this release.

Please refer to Microsoft ’s unimodem diagnostics command specification for more information.

- 69

Command Reference

* Microsoft is a registered trademark of Microsoft Corporation.

56K Softmodem

- 70

56K Softmodem

Command Reference

Table 4-16: #UD Last Call Status Report Format

* Refers to Table 1 in the Microsoft specification.

Note:

Key Value(s) Required Definition Implemented

0 2 digits Yes Diagnostic command specification revision

number, digit.digit.

1 See

Table 417: Call Setup Result Codes on page 75

2 See

Table 3*

3 See

Table 4*

4 String Yes V.8 CM octet string. Same format as V.25ter Annex

5 String Yes V.8 JM octet string. Same format as V.25ter Annex

6 — F

1 0

—

2 digits Note 4* Received signal power level in –dBm (0—43). X

0-A Call setup result code. X

0-1 Multimedia mode.

0 DTE-DCE interface mode.

A, in quotes.

A in quotes.

Reserved for call negotiation reports.

—

1 1

1 2

1 3

1 4

1 5

1 6

1 7

1 8

2 digits Note 4* Transmit signal power level in –dBm (0—17). X

2 digits Note 4* Estimated noise level in –dBm (10—90). X

2 digits Note 4* Normalized mean squared error. 100 (0x64) = min-

imum intersymbol distance.

2 digits Note 4* Near echo loss in dB. X

2 digits Note 4* Far echo loss in dB. X

4 digits Note 4* Far echo delay in ms.

—

Note 4*

—

- 71

56K Softmodem

Command Reference

1 9 — 1 F

2 0

2 1

—

See Table 418: gstnModulationSche meActive from

3.7.2/ V.58 on page 75

See Table 418: gstnModulationSche meActive from

3.7.2/ V.58 on page 75

Reserved for modulation setup and training reports (see note 5*).

Note 6* Transmit carrier negotiation result. X

Note 6* Receive carrier negotiation result. X

—

2 2

2 3

2 4

2 5

2 6

2 7

2 8 — 2 F

3 0

3 1

4 digits 0—

1F40

4 digits 0—

1F40

4 digits 0—FA0 Transmit carrier frequency (0—4000).

4 digits 0—FA0 Receive carrier frequency (0—4000).

4 digits 0—

FA00

4 digits 0—

FA00

—

2 digits 0—FF Temporary carrier loss event count.

2 digits 0—FF Carrier rate renegotiation event count.

Transmit carrier symbol rate (0—8000). X

Receive carrier symbol rate (0—8000). X

Initial transmit carrier data rate (0—64000). X

Initial receive carrier data rate (0—64000). X

Reserved.

—

3 2

2 digits 0—FF Carrier retrains requested. X

- 72

56K Softmodem

Command Reference

3 3

3 4

3 5

3 6 — 3 F

4 0

4 1

4 2

2 digits 0—FF Carrier retrain requests granted. X

4 digits 0—

FA00

4 digits 0—

FA00

—

See Table 419: errorControl Active from

3.5.2/ V.58 on page 77

3 digits 0—400 Error control frame size.

2 digits 0—FF Error control link time-outs. X

0—2 Protocol negotiation result (see note 7*). X

Final transmit carrier rate. X

Final receive carrier rate. X

Reserved.

—

4 3

4 4

4 5

4 6 — 4 F

5 0

5 1

2 digits 0—FF Error control link NAKs.

See Table 420: compressionActiv e from

3.2.2/ V.58 on page 77

4 digits 0—200 Compression dictionary size (see note 7*).

—

1 digit 0—2 Transmit flow control: • 0 = off. • 1 = DC1/DC3. • 2

1 digit 0—2 Receive flow control: • 0 = off. • 1 = DC1/DC3. • 2 =

0—1 Compression negotiation result (see note 7*). X

Reserved.

= V.24 ckt 106/133.

V.24 ckt 106/133.

—

- 73

56K Softmodem

Command Reference

5 2

5 3

54 8 digits 0—FFFF Transmit characters lost (data overrun errors from

55 8 digits 0—FFFF Receive characters lost (data overrun errors from

56 8 digits 0—

57 8 digits 0—

58 8 digits 0—FFFF Transmit frame error count, if error control protocol

59 8 digits 0—FFFF Receive frame error count, if error control protocol

5A — 5F

8 digits 0—

—

FFFFFF FF

FFFFFFFF

Transmit characters sent from DTE (see note 8*).

Receive characters sent to DTE (see note 8*).

DTE) (see note 9*).

Transmit frame count, if error control protocol running (see note 9*).

Receive frame count, if error control protocol running (see note 9*).

running (see note 9*).

Reserved.

—

60 See Table

4-21: Additional callCleared Codes (3.6.4/V.58) on page 77 and Table 4-22: callCleared Codes from

3.6.4/V.581994 on page 78

61 2 digits 0—FF Call waiting event count.

62— 7F

80— FF

—

Note 10* Termination cause. X

Reserved for future versions of the specification.

Reserved for manufacturer proprietary keys.

—

- 74

56K Softmodem

Command Reference

Note:* Refers to notes or tables in the Microsoft specification.

Table 4-17: Call Setup Result Codes

Note:* Refers to Table 2 in the Microsoft specification.

Code Definition Implemented

0 No previous call (modem log has been cleared since any previous call). X

1 No dial tone detected. X

2 Reorder signal detected. Network busy.

3 Busy signal detected. X

4 No recognized signal detected. X

5 Voice detected.

6 Text telephone signal detected (see V.18).

7 Data answering signal detected (e.g., V.25 ANS, V.8ANSam). X

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.8 bis signal detected.

C—F Reserved.

Table 4-18: gstnModulationSchemeActive from 3.7.2/V.58

Note:* Refers to Table 6 in the Microsoft specification.

Value

Description Implemented

(hexadecimal)

—

0 V.17.

1 V.21.

2 V.22.

3 V.22 bis.

4 V.23 constant carrier (1200/75).

5 V.23 switched carrier (half duplex).

6 V.26 bis.

7 V.26 ter.

8 V.27 ter.

9 V.29 HD.

—

- 75

56K Softmodem

Command Reference

A V.32. X

B V.32 bis.

C V.34. X

D V.34 HD.

E V.pcm (asymmetric).

F V.pcm (symmetric).

E–7F Reserved (V.58).

80 X2.

82 V.FC.

83 V.32terbo.

80–FF Reserved for mfgs.

—

- 76

Table 4-19: errorControl Active from 3.5.2/V.58

Note:* Refers to Table 7 in the Microsoft specification.

Value Description Implemented

0 Disable/none. X

1 V.42 LAPM. X

2 V.42 alternative protocol (MNP). X

56K Softmodem

Command Reference

3—7F Reserved (V.58).

80 MNP Class 10.

81 Enhanced cellular protocol.

82 ETC *.

82—FF Reserved for mfgs.

Note:* ETC is a registered trademark of Paradyne Corporation.

Table 4-20: compressionActive from 3.2.2/V.58

Note:* Refers to Table 8 in the Microsoft specification.

Value Description Imple-

0 None. X

1 V.42 bis. X

2—7F Reserved (V.58).

80 MNP Class 5. X

—

mented

81—FF Reserved for manufacturers.

Table 4-21: Additional callCleared Codes (3.6.4/V.58)

Note:* Refers to Table 9 in the Microsoft specification.

Code Definition Imple-

1 No previous call. X

2 Call is still in progress. X

3 Call waiting signal detected.

4 Delayed (see ETS 300 001). X

—

mented

—

- 77

56K Softmodem

Command Reference

Table 4-22: callCleared Codes from 3.6.4/V.58-1994

Note:callCleared indicates that the DCE has gone on-hook and that the previously existing network con-

nection has been cleared. These values are hexadecimal, converted from decimal in V.58. Refer to Table 10 in the Microsoft specification.

Value Description Notes Implemented

0 CauseUnidentified. Call setup issues. X

1—3 See Table 4-21: Additional call-

Cleared Codes (3.6.4/V.58) on page

77.

A NMSinitiatedDialCall. Network management system.

B NMSinitiatedLeasedLineRestoral. Network management system.

C NMSinitiatedRedial. Network management system.

D NMSinitiatedDialDisconnect. Network management system.

14 PowerLoss. DCE.

15 EquipmentFailure.

16 FrontPanelDisconnectRequested.

17 FrontPanelLeasedLineRestoral.

18 AutomaticLeasedLineRestoral.

19 InactivityTimerExpired.

1E cct116RestoralRequest. DTE interface.

1F cct108isOffInhibitsDial.

20 cct108turnedOff.

—

28 NoNumberProvided. Line interface.

29 BlacklistedNumber.

2A CallAttemptsLimitExceeded.

2B ExtensionPhoneOffhook.

2C CallSetupFailTimerExpired.

2D IncomingCallDetected.

2E LoopCurrentInterrupted.

2F NoDialTone.

30 VoiceDetected.

31 ReorderTone.

32 SitTone.

—

— —

—

- 78

56K Softmodem

Command Reference

33 EngagedTone.

—

Value Description Notes Implemented

34 LongSpaceDisconnect.

3C CarrierLost. Signal converter. X

3D TrainingFailed.

3E NoModulationinCommon.

3F RetrainFailed.

40 RetrainAttemptCountExceeded.

41 GstnCleardownReceived.

42 FAXDetected.

46 InTestMode. Test.

47 IntrusiveSelfTestInitiated.

50 AnyKeyAbort. Call control. X

51 DteHangupCommand.

52 DteResetCommand.

—

— —

—

5A FrameReject. Error control.

5B NoErrorControlEstablished.

5C ProtocolViolation.

5D n400exceeded.

5E NegotiationFailed.

5F DisconnectFrameReceived.

60 SabmeFrameReceived.

64 LossOfSynchronization. Data compression.

—

- 79

56K Softmodem

Command Reference

- 80

Result Codes

The 56K Softmodem AT command handler responds to commands from the caller and to activity on the line via result codes. Table 5-1: presents a summary of these result codes.

Two forms of each result code are available. The long-form, or verbose, response is given when V1 is selected, and the short-form, numeric response is given when V0 is selected. The long-form code is preceded and terminated by the sequence <CR> <LF>. The short-form is also terminated by <CR>, but it has no preceding sequence. If result codes are suppressed, nothing is returned to the caller.

56K Softmodem

Command Reference

Table 5-1: Result Code Summary

Result Code Numeric

Description

Code

OK 0 Acknowledges the execution of a command line.

CONNECT 1 Modem connected to line.

RING 2 Incoming ring signal has been detected.

NO CARRIER 3 Modem lost carrier signal, does not detect carrier signal, or does not

detect answer tone.

ERROR 4 Invalid command.

CONNECT 1200 EC* 5 Connection at 1200 bits/s.

NO DIALTONE 6 No dial tone detected.

BUSY 7 Busy signal detected.

NO ANSWER 8 Remote end never answered.

CONNECT 2400 EC* 10 Connection at 2400 bits/s.

CONNECT 4800 EC* 11 Connection at 4800 bits/s.

CONNECT 9600 EC* 12 Connection at 9600 bits/s.

CONNECT 14400 EC* 13 Connection at 14400 bits/s.

CONNECT 19200 EC* 14 Connection at 19200 bits/s.

CONNECT 7200 EC* 24 Connection at 7200 bits/s.

CONNECT 12000 EC* 25 Connection at 12000 bits/s.

CONNECT 16800 EC* 86 Connection at 16800 bits/s.

CONNECT 300 EC* 40 Connection at 300 bits/s.

CONNECT 21600 EC* 55 Connection at 21600 bits/s.

CONNECT 24000 EC* 56 Connection at 24000 bits/s.

CONNECT 26400 EC* 57 Connection at 26400 bits/s.

CONNECT 28800 EC* 58 Connection at 28800 bits/s.

- 81

56K Softmodem

Command Reference

Result Code Numeric

Description

Code

CONNECT 31200 EC* 59 Connection at 31200 bits/s.

CONNECT 33600 EC* 60 Connection at 33600 bits/s.

CONNECT 38400 EC* 28 Connection at 38400 bits/s (DTE rate).

CONNECT 57600 EC* 18 Connection at 57600 bits/s (DTE rate).

CONNECT 115200 EC*

DELAYED 88 Delay is in effect for the dialed number.

BLACKLISTED 89 Dialed number is blacklisted.

BLACKLIST FULL 90 Blacklist is full.

CONNECT 32000 EC* 70 Connection at 32000 bits/s.

CONNECT 34000 EC* 71 Connection at 34000 bits/s.

CONNECT 36000 EC* 72 Connection at 36000 bits/s.

CONNECT 38000 EC* 73 Connection at 38000 bits/s.

CONNECT 40000 EC* 74 Connection at 40000 bits/s.

CONNECT 42000 EC* 75 Connection at 42000 bits/s.

87 Connection at 115200 bits/s (DTE rate).

CONNECT 44000 EC* 76 Connection at 44000 bits/s.

CONNECT 46000 EC* 77 Connection at 46000 bits/s.

CONNECT 48000 EC* 78 Connection at 48000 bits/s.

CONNECT 50000 EC* 79 Connection at 50000 bits/s.

CONNECT 52000 EC* 80 Connection at 52000 bits/s.

CONNECT 54000 EC* 81 Connection at 54000 bits/s.

CONNECT 56000 EC* 82 Connection at 56000 bits/s.

CONNECT 28000 EC* 100 Connection at 28000 bits/s.

CONNECT 29333 EC* 101 Connection at 29333 bits/s.

CONNECT 30666 EC* 102 Connection at 30666 bits/s.

CONNECT 33333 EC* 103 Connection at 33333 bits/s.

CONNECT 34666 EC* 104 Connection at 34666 bits/s.

CONNECT 37333 EC* 105 Connection at 37333 bits/s.

CONNECT 38666 EC* 106 Connection at 38666 bits/s.

CONNECT 41333 EC* 107 Connection at 41333 bits/s.

CONNECT 42666 EC* 108 Connection at 42666 bits/s.

CONNECT 45333 EC* 109 Connection at 45333 bits/s.

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56K Softmodem

Command Reference

Result Code Numeric

Description

Code

CONNECT 46666 EC* 110 Connection at 46666 bits/s.

CONNECT 49333 EC* 111 Connection at 49333 bits/s.

CONNECT 50666 EC* 112 Connection at 50666 bits/s.

CONNECT 53333 EC* 113 Connection at 53333 bits/s.

CONNECT 54666 EC* 114 Connection at 54666 bits/s.

Note:*EC only appears when the extended result codes configuration option is enabled. EC is replaced by

one of the following symbols, depending on the error control method used: V42bis—V.42 error control and V.42 bis data compression. V42—V.42 error control only. MNP 5—MNP class 4 error control and MNP class 5 data compression. MNP 4—MNP class 4 error control only. NoEC—no error control protocol.

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56K Softmodem

Command Reference

S-Registers

The current setting of each S-register may be displayed by the S<register number>? command. There are two forms for this command.

Table 5-2: S<register number> Extended Syntax

Syntax Function

S<register_number>? Displays register contents.

S<register_number>=<value>* Sets the contents of the register to <value>.

Note:* Some registers are read only and are not affected by the S<register number>=<value> command.

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56K Softmodem

Command Reference

Table 5-3: S-Register Summary

Note: * Values presented in decimal except where noted.

S0 Auto answer ring number. 0—255 Rings

S1 Ring counter. 0—255 Rings 0

S2 AT escape character (user defined). 0—255 ASCII 43(2Bh)

S3 Carriage return character. 0—127 ASCII 13(0Dh)

S4 Line feed character. 0—127 ASCII 10(0Ah)

S5 Back space character. 0—255 ASCII 8(08h)

S6 Time for dial tone. 3—255 s

S7 Wait time for carrier. 1—255 s

S8 Pause time for dial delay modifier. 0—255 s

S9 Reserved.

S10 Reserved.

S11 DTMF tone duration. 50—255 ms

S12 Escape guard time. 0—255 20 ms 50

S20 Sync underrun fill character. 0—255

S21 V.24/general bit-mapped options sta-

tus: DTR behavior, DCD behavior.

—

— —

—

— —

—

0†

3†

50†

2†

95†

48(00110000b)

S29 Flash dial modifier time. 0—255 10 ms 50

S30 Inactivity timer. 0—255 10 min. 0

S35 Reserved.

S36 LAPM failure control.

S37 Line connection speed.

S42 Reserved.

S43 Reserved.

S48 V.42 negotiation control.

S54 Blind dialing delay. 2—255

S90 Reserved.

S91 PSTN transmit attenuation level. 6—25

S92 FAX transmit attenuation level. 6—25 dB 10

S93 DTMF transmit attenuation level. 5—25 dB 6

—

— —

—

— — —

—

— —

—

— —

–

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56K Softmodem

Command Reference

S94 DTMF transmit attenuation level for

high DTMF group.

Note:†Values are country-specific.

S-Register Definitions

S0—Auto-Answer Ring Number

This register determines the number of rings the modem will count before automatically answering a call. The user can disable autoanswer by entering zero. When autoanswer is disabled, modem can answer only with the A command.

Range: 0—255.

Default: 0.

Base Unit: 1 ring.

S1—Ring Counter

S1 is incremented each time the 56K Softmodem detects a ring signal on the telephone line. S1 is cleared if no rings occur over a six second interval. This register is read-only.

0—25 dB 0

Range: 0—255.

Default: 0.

Base Unit: 1 ring.

S2—AT Escape Character (User-Defined)

S2 holds the decimal value of the ASCII character used as the escape character. The default value corresponds to an ASCII +. The escape sequence allows the modem to exit data mode and enter command mode when on-line. A value over 127 disables the escape process, i.e., no escape character will be recognized.

Range: 0—255.

Default: 43 (+).

Base Unit: ASCII.

S3—Carriage Return Character (User-Defined)

S3 sets the character used to terminate command line and result codes. Note: This register value is not stored with the &W command.

Range: 0—127.

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Default: 13 (carriage return).

Base Unit: ASCII.

S4—Line Feed Character (User-Defined)

Use this register to set the ASCII value used as the line feed character. The 56K Softmodem uses a line feed character in command mode when it responding to the computer.

Note: This register value is not stored with the &W command.

Range: 0—127.

Default: 10 (line feed).

Base Unit: ASCII.

S5—Back Space Character (User-Defined)

56K Softmodem

Command Reference

S5 sets the character recognized as a backspace. (Pertains to asynchronous operation only.) The modem will not recognize the backspace character if it is set to a value that is greater than 32 ASCII. This character can be used to edit a command line. When the echo command is enabled, the 56K Softmodem echoes back to the local DTE the backspace character, an ASCII space character, and a second backspace character. Therefore, a total of three characters are transmitted each time the modem processes a backspace character.

Note: This register value is not stored with the &W command.

S6—Time for Dial Tone

Use this register to set the length of time in seconds between the 56K Softmodem’s off-hook event and dialing the first digit of the number. The 56K Softmodem always pauses for a minimum of three seconds, even if the value of S6 is less than three seconds. The wait for dial tone progress feature (W dial modifier in the dial string) will override the value in register S6. This operation, however, may be affected by some X<value> command options according to country restrictions.

Range: 0—255.

Default: 8 (backspace).

Base Unit: ASCII.

If bit seven of S53 is not set, this command sets the length of time (in seconds) that the 56K Softmodem will wait for a dial tone before starting blind dialing.

Range: 3—255.

Default: 3.

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Base Unit: 1 s.

S7—Wait Time for Carrier

S7 sets the length of time (in seconds) that the modem will wait for a carrier before hanging up. The timer starts when the 56K Softmodem finishes dialing (originate) or two seconds after going off-hook (answer). In originate mode, the timer is reset upon detection of an answer tone if allowed by country restrictions. The timer also specifies the wait for silence time for the @ dial modifier in seconds. S7 is not associated with the W dial modifier.

Range: 1—255.

Default: 50.

Unit: 1 s.

S8—Pause Time for Dial Delay Modifier

S8 sets the time, in seconds, that the 56K Softmodem will pause when a dial delay modifier(,) is encountered in the dial string.

56K Softmodem

Command Reference

S11—DTMF Tone Duration

This register determines the dialing speed which is prefixed for each country. For countries where change of the DTMF is not allowed, the value of S11 is set to 0. The value in S11 has no effect on pulse dialing.

S12—Escape Guard Time

This register sets the value in 0.02 s increments for the required pause after the escape sequence.

Range: 0—255.

Default: 2.

Base Unit: 1 s.

Range: 50—255.

Default: 95.

Base Unit: 1 ms.

Range: 0—255.

Default: 50.

Base Unit: 0.02 s.

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S20—Sync Mode Underrun Fill Character

Specifies the character that will be sent in sync mode when there is not enough valid data available.

Range: 0 to 255.

Default: 0.

S21—V.24/General Bit-Mapped Options Status

S21 indicates the status of command options. Only bits 3, 4, and 5 are used; they are read-only.

•

Default: 48 (30h) (00110000b).

Table 5-4: Register S21 Bits

Bit Description Value

56K Softmodem

Command Reference

0 Set by &J<value> command but other-

wise ignored.

1 Sync mode underrun action. 0 = Send underrun fill character (20) (default). 1

3—4 DTR behavior (&D<dial string>). 0 = &D0 selected. 1 = &D1 selected. 2 = &D2

5 DCD behavior (&C<value>). 0 = &C0 selected. 1 = &C1 selected (default).

6 DSR behavior (&S<value>). 0 = &S0 selected (default). 1 = &S1 selected.

7 Long space disconnect (Y<value>). 0 = Y0 (default). 1 = Y1.

0 = J0 (default). 1 = J1.

= Repeat last valid character.

selected (default). 3 = &D3 selected.

S29—Flash Dial Modifier Duration

Set the duration of the hook flash (!).

Range: 0—255.

Default: 50.

Base Unit: 10 milliseconds.

S30—Inactivity Timer

This register specifies the length of time in minutes that the modem will wait before disconnecting when no data is sent or received. This function is only applicable to buffer mode.

Range: 0—255.

Default: 0 (disabled).

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Command Reference

Base Unit: 10 min.

S36—LAPM Failure Control

Default: 7 (00000111b).

•

Bit Description Value

56K Softmodem

0—2 Action upon LAPM failure. If S48 = 128,

the fallback options are initiated immediately after establishing the data connection. If an invalid number is entered, the number is accepted into the register, but S36 will act as if the default value has been entered. Note: For performance reasons, an error-corrected link is not supported in V.23 (1200/75 bits/s) or any 300 bits/s mode.

4—7 Reserved.

S37—Dial Line Rate*

0 = The 56K Softmodem disconnects.

1 = The 56K Softmodem stays on-line and a normal mode connection is established.

2 = Reserved.

3 = The 56K Softmodem stays on-line and a normal mode connection is established.

4 = A MNP connection is attempted and if it fails, the 56K Softmodem disconnects.

5 = A MNP connection is attempted and if it fails, a normal mode connection is established.

6 = Reserved.

7 = A MNP connection is attempted and if it fails, a normal mode connection is established (default).

—

This register sets the maximum line data rate. In V.90 mode, S37 controls the upstream V.34 rate.

Range: 0—19.

Default: 0.

* The register default shown here is for North America.

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Command Reference

Table 5-5: Table 152. Register S37 Values

Value Rate Valu e Rate

0 Auto rate (default). 10 12000 bits/s.

1 Reserved. 11 14400 bits/s.

2 1200/75 bits/s (V.23). 12 16800 bits/s.

3 300 bits/s. 13 19200 bits/s.

4 Reserved. 14 21600 bits/s.

5 1200 bits/s. 15 24000 bits/s.

6 2400 bits/s. 16 26400 bits/s.

7 4800 bits/s. 17 28800 bits/s.

8 7200 bits/s. 18 31200 bits/s.

9 9600 bits/s. 19 33600 bits/s.

56K Softmodem

S48—LAPM Error Control and Feature Negotiation

This register is used in conjunction with register S36 to define LAPM error control and feature negotiation. If an invalid number is entered, the register accepts the value but S48 uses the 128 setting.

Range: 0, 7, or 128.

Default: 7.

Table 5-6: Register S48

Value Description

S48 = 7 Enable negotiation (default).

S48 = 128 Disable negotiation. Forces immediate fallback options specified in S36.

S48 = 0 Disable negotiation. Bypass the detection and negotiation phases and then proceed with

LAPM.

The following table lists the S36 and S48 configuration settings necessary to negotiate certain types of connections.

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Table 5-7: Table 154. Register S36 and S48 Configuration Settings

S36 = 0, 2 LAPM or hang-up. Do not use.

S36 = 1, 3 LAPM or asynchronous. Asynchronous.

S36 = 4, 6 LAPM, MNP, or hang-up. MNP or hang-up.

S36 = 5, 7 LAPM, MNP, or asynchronous. MNP or asynchronous.

S54—Blind Dialing Delay

When bit 7 of S53 is set, this register controls the length of time (in seconds) that the modem will wait before starting to dial after going off-hook when blind dialing. This register is used for the countries where the wait for dial tone delay (S6) can be set differently from blind dialing delay.

S91—Data Transmit Level

56K Softmodem

Command Reference

Range: 6—25 (corresponding to –6 dBm to –25 dBm transmit level).

Default: 10 (–10 dBm transmit level).

Base Units: –dBm transmit level.

S92—FAX Transmit Level

Sets the transmit attenuation level from 6 to 25 dBm for the FAX mode, resulting in a transmit level from –6 dBM to –25 dBm.

Range: 6 dBm to 25 dBm (corresponding to –6 to –25 dBm transmit level).

Default: 10 (–10 dBm transmit level).

Base Unit: –1 dBm transmit level.

S93—DTMF Transmit Level

This register has a dual purpose:

1 When S94 is set to zero, this register controls the overall DTMF transmit level, with the twist between DTMF groups fixed at 2 dB.

2 When S94 is set to a nonzero value, this register controls the transmit level for low DTMF group only.

Range: 5 to 25 dBm (corresponding to –5 to –25 dBm transmit level).

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US Robotics 56 K SOFTMODEM - COMMAND REFERENCE REV 1, 56 1 Command Reference Manual

Specifications and Main Features

Frequently Asked Questions

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