18
AT dialing
AT dialing is similar to the methods used to make data calls with a Hayes
Smartmodem. Some AT commands do not apply to the MCA, and are not
supported.
Most AT commands begin with the letters AT (not case sensitive). These two letters
are followed by a one- or two-character command (sometimes followed by
additional parameters) and a carriage return. Each command line is limited to a
maximum of 40 characters (not including the AT and spaces).
You will not hear any tones when using AT dialing with the MCA.
Note: Remember that all of these commands (except A/ and the escape code) are
followed by a carriage return).
If you don not include a numerical parameter with a command, the MCA assumes
the parameter to be zero (0).
A/ (repeat last command)
This sequence repeats the last command you entered. It is not preceded by AT and
not followed by carriage return.
ATA (answer)
This answers an incoming data call when the MCA is set for manual answer
(S-register 0 = 0).
ATCn (carrier detect enable/disable, where n = 0, 1)
Carrier detect is enabled when n = 1, disabled when n = 0. When enabled, the
carrier detect lead will be off until a data call has been established.
ATDxxxx (dial, where x = 0–9)
This performs a manual data call. The digits, xxxx, represent the phone number of
the far end data device.
ATEn (echo, where n = 0, 1)
Commands do not echo back to your terminal when n = 0. Meaning, you do not
see your commands, only their result. Commands will echo when n = 1.