1.INTRODUCTION TO AT COMMANDS
•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.
55
LZT 123 7361 R1A
