Allied Data Technologies
7
2
MODEM COMMANDS
This chapter describes the AT commands used for setting up and operating the
Tornado
SFM 56.0
.
2.1
Using the AT commands
Most modems and communications software uses the AT command set. Some modem
manufacturers add their own commands to the AT command set. Consequently there is no
longer one standard. A distinction is made between the 'Standard AT' and 'Extended AT'
command sets. If you are using Windows 95/98, it is generally not important to know the
AT commands.
2.2
Command line format
A command line begins with the letters AT, from the English word ATtention. The letters AT
should both be in either upper case or lower case. The command line ends with
<ENTER>. One or more commands can be given on each command line. A command line
may not contain more than 54 characters. You cannot type more than 54 characters on
one line.
TAKE NOTE: The modem remembers the last command line. To repeat it, type: A/
(without <ENTER>).
For clarity commands must be separated from each other by spaces. The spaces count
towards the total length of the command line.
A command is sometimes followed by a parameter (number). If the parameter is 0, it may
be omitted. For example: ATE0 is the same as ATE.
From the letters AT at the beginning of the command line the modem identifies the baud
rate and parity of the terminal and configures itself accordingly. The rates which are
recognised automatically are 300, 1200, 2400, 4800, 9600, 19,200, 38,400, 57,600 and
115,200 bps.
