User's Manual

1. INTRODUCTION TO AT COMMANDS

LZT 123 7361 R1A

• AT*<command>=[<parameter>]

Example! AT+CFUN=0<CR> (powers down the modem)

If several values are included in the command, they are separated by

commas. It is also possible to enter commands with no values.

Additional commands may follow an extended syntax command on the

same command line if a semicolon (; IRA 3B) is inserted after the

preceeding extended command as a separator.

Read Command Syntax

The read command is used to check the current values of

parameters. Type ‘?’, after the command line:

• AT+<command>?

• AT*<command>?

• AT<command>?

Example! AT+CSCS?<CR> (show current character set)

<CR>“IRA”<CR>(information text response)

<CR>OK<CR>(final result code response)

Test Command Syntax

The test command is used to test whether the command has been

implemented or to give information about the type of subparameters it

contains. Type ‘?’, after the command line:

• AT+<command>=?

• AT*<command>=?

Example! AT+CPAS=?<CR> (shows supported values for the response

parameters)

<CR>CPAS: (0, 3, 4, 129, 130, 131)<CR> (supported values)

<CR>OK<CR> (final result code)

If the indicated <parameter> is not recognized, the result code ERROR

is issued.

Note! Possible responses are indicated both as <command>:(list of

supported<parameter>) and (in most cases) the actual range of the

parameter values.

1.2.3 AT Response Syntax

The default mode response shown below, is in text mode. See the

command V for further details.