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Owner’s Manual Rev 1.0 Page 55 of 55
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 TT4031 (SE-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 TT4031
(SE-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.