AT Command Reference
80-99208-1 Rev. D 6-7
AT Commands Overview

Command Alphabet

The ASCII character set is the alphabet used for the AT
command set. Only the low order seven bits of each charac ter
are considered significant.

Case Sensitivity

Although AT commands are specified in uppercase
throughout this Integrator’s Reference Manual, both
uppercase and lowercase are valid. The modem does not
distinguish between uppercase an d lowercase letters.

Command Line Format

AT command lines are made up of three parts: the prefix, the
body, and the termination charac ter.
The command line prefix consists of the letters AT. The
command line prefix is followed by the body , which consists of
one or more AT commands. Command syntax for each specific
AT command within the bo dy is as specified in this d ocument,
for example, E or $QCSTATUS.
Space characters can be used freely within the body for
formatting purposes. Command lines are terminated with the
termination character specified by S-register S3 (see
Command Line Termination Character (S3) on page 6-25).
The default value of S3 is the carriage retur n character <CR>
(ASCII value of 13 decimal).
You can use an alternate co mmand line prefix, which causes
the previously entered command line (body and terminator)
to be executed. This command line prefix consists of the
letters A/.
Note
No terminator is required after entering the / character to begin
command line execution.