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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.
4
Table 1-1 Format of a basic command
Command Format Description
<command>[<number>] In the command format, <command> indicates a single
letter (A–Z) or the & symbol plus a single letter.
In the command format, <number> indicates a decimal
number with one digit or multiple digits. The digit 0 in the
forefront of <number> can be ignored.
Note:
If a basic command that is allowed to contain <number> does not contain <number>, the
default value of <number> is used in the command.
If a basic command that is not allowed to contain <number> contains <number>, "Operation
not allowed" is returned.
An S register command consists of the letter S and a decimal number, which is called
the parameter number of the register. An S register command can be in the format of
read command and write command.
Table 1-2 describes the format of an S register
command.
Table 1-2 Format of an S register command
Command Format Description
Read
command
S<parameter
number>?
Returns the ASCII code of characters currently saved
in the S register. The ASCII code is expressed by a
3-digit decimal number. The digit 0 is added in the
front of the number in case of insufficient digits.
Write
command
S<parameter
number>=<value>
Replaces the characters saved in the S register with
the characters related to the value of <value>.
Note:
If the parameter number of the register is not identified, this indicates that the command does
not exist. In this case, ERROR is returned.
All extended commands start with the + symbol. Vendor-defined commands start with
a special symbol such as ^ and %. In this document, all vendor-defined commands
start with the ^ or \ symbol. Extended and vendor-defined commands are further
categorized into action commands and parameter commands.
Table 1-3 describes
the types and formats of extended and vendor-defined commands.
An action command refers to a command that performs a specific action in addition to
interacting with the local parameters of the MS, including AT+CPBR and AT+CMGS.
An action command may or may not contain parameters. Action commands are
categorized into execution (write) command and test command. A parameter
command refers to a command that interacts with the local parameters of the MS
only, certain of which may affect the execution of action commands. Parameter
commands are categorized into write command, read command, and test command.