Huawei MC509 manual 1Format of a basic command, Command Format Description

HUAWEI MC509 CDMA LGA 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 at
		the start 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>, "ERROR" or “+CME ERROR : 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 set command. Table 1-2describes 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
command	number>?	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.
Set	S<parameter	Replaces the characters saved in the S register
command	number>=<value>	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 ^ symbol. Extended and vendor-defined commands are further categorized into action commands and parameter commands. Table 1-3describes 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^HCMGS. 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 MT only, certain of which may affect the execution of action commands. Parameter commands are categorized into set command, read command, and test command.

Issue 01 (2011-08-26)	Huawei Proprietary and Confidential	20
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