CME GPP-3 Specifications download pdf (Page 13)

3GPP

3GPP TS 27.007 V6.3.0 (2003-

06)

Release 6

4 AT command syntax

This clause summarizes general aspects on AT commands and issues related to them.

TE software implementors must take account that future versions of this specification may include additional

parameters beyond what is expected in any response to an AT Set Command, Read Command, Test Command, or

unsolicited result code. Implementations must therefore analyse all parameters provided from the TA and discard

(ignore) any parameters received following the parameters expected by the TE software.

For further information refer ITU-T Recommendation V.250 [14].

4.1 Command line

See figure 2 for general structure of a command line. Standardized basic commands are found only in V.250 [14].

GSM/UMTS commands use syntax rules of extended commands. Every extended command has a test command

(trailing =?) to test the existence of the command and to give information about the type of its subparameters.

Parameter type commands also have a read command (trailing ?) to check the current values of subparameters. Action

type commands do not store the values of any of their possible subparameters, and therefore do not have a read

command.

ATCMD1 CMD2=12; +CMD1; +CMD2=,,15; +CMD2?; +CMD2=?<CR>

command line prefix

basic command

(no + prefix)

subparameter

extended command

(prefixed with +)

extended commands are

delimited with semicolon

subparameters

may be omitted

command line

termination character

read command for checking

current subparameter values

test command for checking

possible subparameter values

Figure 2: Basic structure of a command line

If verbose responses are enabled with command V1 and all commands in a command line has been performed

successfully, result code <CR><LF>OK<CR><LF> is sent from the TA to the TE. If numeric responses are enabled

with command V0, result code 0<CR> is sent instead.

If verbose responses are enabled with command V1 and subparameter values of a command are not accepted by the TA

(or command itself is invalid, or command cannot be performed for some reason), result code

<CR><LF>ERROR<CR><LF> is sent to the TE and no subsequent commands in the command line are processed. If

numeric responses are enabled with command V0, result code 4<CR> is sent instead. ERROR (or 4) response may be

replaced by +CME ERROR: <err> (refer clause 9) when command was not processed due to an error related to MT

operation.

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