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Appendix: AT Commands Set
CommFront User Manual 39
APPENDIX: AT COMMANDS SET
1. Introduction
AT commands are used for controlling modem, GSM, and many other types of
communication equipment that come with a serial port. CommFront’s device servers
use AT commands for querying or setting parameters such as COM port and IP
parameters.
2. Syntax
“AT” stands for “attention”, and it must be used at the beginning of each command
line. The AT command must be terminated with a <CR> code (HEX code: 0D). AT
commands are usually responded to by the device, and the response looks something
like: “AT+COMMAND<CR><CR><LF>< response ><CR><LF>”. Throughout this
document, only the responses are presented. “<CR><LF>” is omitted intentionally.
Command syntax
Query command:
AT+COMMAND<CR>
Set command:
AT+COMMAND=<parameter1,parameter2,…><CR>
Response syntax
Query command:
+OK=<parameter1,parameter2,…>
Set command:
+OK
Error:
+ERR=<number>
Error codes
Error code Description
1 Invalid format
2 Invalid command
3 Invalid operator
4 Invalid parameter
5 Invalid operation