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MC55 AT Command Set

1.4 AT command syntax

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MC55_ATC_V01.05 Page 17 of 469 2/10/04

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1.4 AT 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:

1.4.1 Using 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.

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.

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