MC55 AT Command Set

1.4 AT command syntax

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mobile

1.4AT command syntax

The "AT" or "at" prefix must be set at the beginning of each command line. To terminate a command line enter

<CR>.

Commands are usually followed by a response that includes "<CR><LF><response><CR><LF>". Throughout this document, only the responses are presented, <CR><LF> are omitted intentionally.

Types of AT commands and responses:

AT command type

Syntax

Function

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.

Exec(ution) command

AT+CXXX

The execution command reads

 

 

non-variable parameters deter-

 

 

mined by internal processes in the

 

 

GSM engine.

 

 

 

1.4.1Using parameters

Optional parameters are enclosed in square brackets. If optional parameters are omitted, the current settings are used until you change them.

Optional parameters or subparameters can be omitted unless they are followed by other parameters. If you want to omit a parameter in the middle of a string it must be replaced by a comma. See also example 1.

A parameter value enclosed in square brackets represents the value that will be used if an optional parameter is omitted. See also example 2.

When the parameter is a character string, e.g. <text> or <number>, the string must be enclosed in quotation marks, e.g. "Charlie Brown" or "+49030xxxx". Symbols within quotation marks will be recognized as strings.

All spaces will be ignored when using strings without quotaton marks.

It is possible to omit the leading zeros of strings which represent numbers.

If an optional parameter of a V.25ter command is omitted, its value is assumed to be 0.

MC55_ATC_V01.05

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2/10/04

Confidential / Released

 

 

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Siemens MC55 manual AT command syntax, Using parameters, At+Cxxx=?, At+Cxxx?