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HUAWEI MG323 GSM M2M Module
AT Command Interface Specification Overall Description
Issue 02 (2010-11-23)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
3
Figure 1-2 Basic organization format the AT command line
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
The returned value of the AT command consists of two parts: response message and
result codes.
Figure 1-3 shows an example of returned value of the AT command.
Figure 1-3 An example of returned value of the AT command
<CR><LF>+CMD2: 3,0,15,"GSM"<CR><LF>
<CR><LF>+CMD2: (0-3),(0,1),(0-12,15),("GSM","IRA")<CR><LF>
<CR><LF>OK<CR><LF>
information response to +CMD2?
information response to +CMD2=?
final result code
also string type subparameters possible
shows acceptable ranges of each subparameter
1.4.2 Types of AT Commands
AT commands are categorized into three types: basic commands, S register
commands, and extended and vendor-defined commands.
A basic command starts with a single letter or with the & symbol plus a single letter.
Table 1-1 describes the format of a basic command.