Huawei MU509 At Command Interface Specification page 213

HUAWEI MU509 HSDPA LGA Module
AT Command Interface Specification
manufacturer-defined commands are divided into two categories: Action command
and parameter command.
1. Action commands
Action commands are the commands that carry out a specific action rather than only
dealing with local parameters of the MS, e.g. AT+CMGS. An action command may
carry parameters or not. Action commands include SET and TEST.

SET command
Command format:
No parameter
With 1 parameter
With more parameters <name> [=<compound_value>]
<compound_value> indicates multiple parameters, separated by "," in the middle. For
the parameters that have a default value, they can be omitted and substitute the
default value. If all the parameters are omitted, the "=" behind <name> should be
omitted too. If <name> is not identified, it indicates that this command does not exist,
and the information "ERROR" will be returned. If <name> is identifiable, and the
command contains uncalled-for parameters, or the number of parameters goes
beyond the defined range, the information "TOO MANY PARAMETERS" will be
returned.

TEST command
Command format:
<name>=?
If the MS cannot identify <name>, the information "ERROR" will be given. If the MS
can identify <name>, and the command carries no parameter, the information "OK"
will be returned. If the command carries parameters, the value range of each
parameter will be returned first, then "OK" will be returned.
2. Parameter commands
Parameter commands refer to the commands that can only deal with the local
parameters of MS. These parameters may affect the execution of the action
commands. Parameter commands include SET, READ and TEST commands.

SET command
Command format:
With 1 parameter:
With more parameters <name> [=<compound_value>]
The SET command is used to set the parameters. <compound_value> means multiple
parameters, separated by "," in the middle. For the parameters that have a default
value, they can be omitted and substitute the default value. If all the parameters are
omitted, the "=" behind <name> should be omitted too. If <name> is not identified, it
indicates that this command does not exist, and the "ERROR" information will be
returned. If <name> is identifiable, and the command contains uncalled-for
parameters, or the number of parameters goes beyond the defined range, the
information "TOO MANY PARAMETERS" will be returned.
Issue 04 (2013-01-28)
<name>
<name> [=<value>]
<name> [=<value>]
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Appendixes
213