Specifications

AT Command Set

TC35-ATC-01-V02.10 Page 8/145 02.10 / 23.05.2001

1 Introduction

This document provides the AT Command Set for the following Siemens GSM engines:

• TC35 Module

• TC37 Module

• TC35 Terminal

The AT commands detailed in this document are supported by all three products. Where differences

occur, they are noted in the chapter that refers to the command. In this version, the only exception is

the AT^SSYNC command that offers various modes depending on the model (see Chapter 6.34).

1.1 Conventions

Throughout the document, the GSM engines are referred to as ME (Mobile Equipment), MS (Mobile

Station), TA (Terminal Adapter), DCE (Data Communication Equipment) or facsimile DCE (FAX mo-

dem, FAX board).

To control your GSM engine you can simply send AT Commands via its serial interface. The control-

ling device at the other end of the serial line is referred to as TE (Terminal Equipment), DTE (Data

Terminal Equipment) or plainly ´the application´ (probably running on an embedded system).

Response:

All the AT Commands described in this document are usually followed by a response that includes

“<CR><LF><response><CR><LF>”. Throughout this document, only the response is listed, not each

<CR><LF>.

AT commands and responses:

Test command AT+CXXX=? The mobile equipment returns the list of parameters and value

ranges set with the corresponding Write command or by

internal processes.

Read command AT+CXXX? This command returns the currently set value of the parameter

or parameters

Write command AT+CXXX=<...

This command sets user-definable parameter values.

Execution

comand

AT+CXXX The execution command reads non-variable parameters

affected by internal processes in the TC35.

General:

Underlined parameters are default parameters.

Optional parameters may be omitted in case of using default values. Do not omit constrained pa-

rameters to use default parameters. Double quotes indicate strings. Symbols within double quotes will

be recognized as strings. A string without double quotes will be interrupted by comma. All spaces will

be ignored when using strings without double quotes. It is possible to omit the leading zeros of strings

which represent numbers.

In case of using V.25ter commands without giving an optional parameter, its value will be assumed as