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21.1 Appendix 1 AT Command Description
21.1.1 Basic Commands
The format of a basic command is:
<command>[<number>]
Where, <command> is a single letter (A-Z) or a "&" plus a single letter, and <number>
is a decimal number composed of one or more digits. The 0s at the head of <number>
will be ignored. If a basic command that can carry <number> carries no <number>,
the <number> value is 0 by default. If a basic command that cannot carry <number>
carries a <number>, the information "TOO MANY PARAMETERS" will be returned.
21.1.2 S Register Command
All commands that begin with "S" are collectively called "S register command".
Command format:
S<parameter number>?
S<parameter number>=<value>
The S register command name is composed of the letter "S" combined with a decimal
number. This decimal number is called "register sequence number (parameter
number)". If the register is not identified, it indicates that this command does not exist,
and the "COMMAND NOT SUPPORT" information will be returned. Each S register
saves a character. If the command name is followed by "?", it indicates a READ
recommend. The ASCII code values currently saved in this S register expressed by a
3-digit decimal number, will be returned. Make up three digits by filling 0s at the end if
there are less than 3 digits. If the command name is followed by "=", the command is a
SET command. In this case, replace the characters stored in this S register with the
characters corresponding to the <value>.
21.1.3 Extended Commands and Manufacturer Defined
Commands
The extended commands begin with "+". The commands defined by the manufacturer
also begin with a special character, e.g. "$", "%". For purpose of this document, all
Issue 18 (2009-06-22)
21
Commercial in Confidence
HUAWEI UMTS M2M Module V100R001
AT Command Interface Specification
Appendixes
Page 157 of 169
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