Motorola G24 AT Commands Structure

Chapter 2: Introduction to AT Commands
June 30, 2008 AT Commands Reference Manual 2-3
AT Commands Structure
Command Structure
An AT command line may contain one or more commands. Delimiters are used to separate the
commands from each other, according to the following structure:
Each AT command has the "AT" prefix string.
Each AT command has the suffix <CR>.
The delimiter is either a semicolon ";" or none, meaning space (basic commands).
Each AT command has the following structure:
The following figure outlines the basic structure of an AT command line:
Figure 2-2: Basic Structure of a Command Line
The following rules must be observed when issuing a command line to the modem:
•Every command line must begin with the letters AT.
•Several commands can be concatenated as one line, as long as the total line does not exceed
140 characters with semicolon characters.
•Characters:
Spaces are ignored. You can leave spaces between each command and between characters of a
command. You can also include punctuation in telephone numbers, and type commands in either
UPPERCASE or lowercase. For example, the following commands are identical:
ATDT8005551234 < Enter > or
atdt (800) 555-1234 < Enter >
Backspace <S5> character is allowed.
•To cancel a dialing command in progress, send any ASCII character to the modem.
•To execute the command line, send the <CR> ASCII character.
Prefix Command1 Delimiter Command2 Delimiter … CommandN Suffix
Token Mode Arguments
ATCMD1 CMD2=12; +CMD1; +CMD2=,,15; +CMD2?; +CMD2=?<CR>
Command
line prefix
Basic command
(no + prefix) Subparameters
may be omitted
Extended command
(prefixed with +) Test command for checking
possible subparameter values
Extended commands are
delimited with semicolon Command line
termination character
Subparameter Read command for checking current subparameter values