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DIVA T/A ISDN Modem Reference Guide
◆
Page 14
Locating AT Commands
To make it easier for you to locate a command, this guide has organized commands in two
ways.
•
A list of
AT Commands grouped into categories
can be found on page 16.
•
An
alphabetical list of commands
is available on page 17.
AT Command Syntax Conventions
When issuing AT commands, you must abide by the following syntax conventions:
•
A command line consists of a prefix, body, and terminator. Each command line must
begin with “AT” (except A/).
•
AT commands must be terminated by a carriage return (except A/).
•
Commands entered in upper or lower case are accepted (except mini-monitor
commands, which must be entered only in lower case).
•
The body is a string of commands restricted to printable ASCII characters (032 - 126).
•
Space (ASCII 032) and control characters other than CR (ASCII 013) and BS (ASCII 010) in
the command string are ignored.
•
A command line may be aborted at any time by entering <Ctrl-X> (ASCII 024).
•
Carriage returns are programmable through register S3.
•
The default terminator is the ASCII <CR> character. Characters that precede the AT prefix
are ignored.
•
The DIVAT/A recognizes the backspace character. When echo is enabled, a backspace or
delete is echoed as a backspace character followed by a space character, and another
backspace. The code for the backspace character is programmable through register S5.
Values equal to 0, greater than 32, or the carriage return character value, cannot be used
for the backspace character.
•
The AT sequence may be followed by any command sequence, except for the following:
ATZ, ATD, ATA, AT@MENU, AT>H, AT>VC, AT>VD, AT>VT, and AT>Z . Comman ds following
these are ignored.
•
Execution of commands ATD and ATA, either as a result of a direct command or a
re-execute command, will be aborted if another character is entered before completion
of the handshake.
•
The maximum number of characters on any command line is 80 (including “A” and “T”).
•
If a syntax error is found in a command, the remainder of the line will be ignored and an
ERROR code will be returned.
•
Missing decimal parameters (n) are assumed as 0.
•
Most commands entered with parameters out of range will not be accepted and the
ERROR response will be returned to the DTE.