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HC15 AT Command Set

1.5 AT Command Syntax

HC15_ATC_V01.001 Page 14 of 234 2/16/07

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1.5 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>". Through-

out this document, only the responses are presented,

<CR><LF> are omitted intentionally.

Table 1.4: Types of AT commands and responses

1.5.1 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 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 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.

AT+CCUG?

Query current setting

+CCUG: 1,10,1

AT+CCUG=,9

Set only the middle parameter

AT+CCUG?

Query new setting

+CCUG: 1,9,1

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