Siemens MC55 AT manual AT Command Syntax, Using Parameters

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>". Through- out this document, only the responses are presented, <CR><LF> are omitted intentionally.

Table 1.4: 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 in 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.250 command is omitted, its value is assumed to be 0.

Example 1: Omitting parameters in the middle of a string

AT+CCUG?	Query current setting
+CCUG: 1,10,1
OK	Set only the middle parameter
AT+CCUG=,9
OK	Query new setting
AT+CCUG?
+CCUG: 1,9,1
OK
Example 2: Using default parameter values for optional parameters
AT+CFUN=5	Activate CYCLIC SLEEP mode, don't reset ME
OK	Query ME mode
AT+CFUN?
+CFUN: 5
OK	Set ME back to normal (default parameters: 1,0)
AT+CFUN=

OK +CFUN: 1

OK

MC55_ATC_V04.00	Page 17 of 475	3/17/06
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