HUAWEI MG323 GSM M2M Module

 

 

AT Command Interface Specification

Overall Description

 

Table 1-1Format 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 1-2Format of an S register command

Command Format

Description

 

 

 

Read

S<parameter

Returns the ASCII code of characters currently saved

command

number>?

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

S<parameter

Replaces the characters saved in the S register with

command

number>=<value>

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.

Issue 02 (2010-11-23)

Huawei Proprietary and Confidential

4

Copyright © Huawei Technologies Co., Ltd.

 

 

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Huawei MG323 manual 1Format of a basic command, Command Format Description