PIONEERPOS G24-LC manual AT Commands Structure, Command Structure, Introduction to AT Commands

Chapter 2: Introduction to AT Commands

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:

Prefix

Command1

Delimiter

Command2

Delimiter

…

CommandN

Suffix

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:

Token

Mode

Arguments

The following figure outlines the basic structure of an AT command line:

Command	Extended commands are	Command line
line prefix	delimited with semicolon	termination character

Subparameter

Read command for checking current subparameter values

ATCMD1 CMD2=12; +CMD1; +CMD2=,,15; +CMD2?; +CMD2=?<CR>

Basic command		Subparameters
(no + prefix)		may be omitted
	Extended	command	Test command	for checking
	(prefixed with +)		possible subparameter values

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.

April 15, 2008 G24-L AT Commands Reference Manual 2-3