User's Manual

LZT 123 7361 R1A

1. Introduction to AT Commands

1.1 Overview

AT commands, issued from a computer in your application are used to

control and implement the functions of the modem.

Using AT commands, the following actions are possible:

• Control of DCE

•GPRS

• Call control

• Supplementary Service

• SIM application tool kit

The GM29 contains a large number of Ericsson-specific commands in

addition to those implemented in accordance with the GSM and ITU-T

recommendations. These commands are provided to enhance the

functions of the modem. The Ericsson-specific commands are identified

by the asterisk that precedes the command (see the syntax description

provided below).

1.2 Syntax Description

This section provides a brief description of the syntax used for the

GM29, AT command set. See the ITU-T recommendation V.25ter for

additional information.

1.2.1 Conventions

In this manual, the following conventions are used to explain the AT

commands.

<command> The name of the command that is to be entered.

<parameter> The parameter values that are defined for a certain

command.

<CR> The command line is terminated by the Carriage

Return (or Enter key) or ATS3 command.

<LF> Line feed character or ATS4 command.

< > The term enclosed in angle brackets is a syntactical

element. The brackets do not appear in the command

line.