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SECURE RACK MODEM
9. Modem Command Set
(AT Commands)
In addition to the Secure Rack Modem’s menu-driven configuration functions, the
internal modem will also accept standard Rockwell format AT commands. This
section describes the AT command set and lists the function of each command.
The AT command set is used to select advanced modem configuration parameters,
which are not available via the Secure Rack Modem’s menuing system. AT
commands can be sent directly to the modem, or added to the user-defined
initialization string via item 13 (Custom Init. String) in the Secure Rack Modem’s
Modem Parameters menu (see
Section 5.3
).
9.1 Communicating with the Internal Modem
In order to invoke AT commands, you must communicate directly with the Secure
Rack Modem’s internal modem. The modem command mode is only available via
the console port or the serial modem port; inbound callers cannot communicate
directly with the modem. To send AT commands to the Secure Rack Modem’s
internal modem proceed as follows.
1. Via console port: Access the Secure Rack Modem’s Command mode as
described in
Section 5.1.1
.
a) When the “SRM>” command prompt appears, type
/U
and press
[Enter]
to
display the modem’s utilities screen.
b) When the utilities screen appears, type
8
and press
[Enter]
to activate the
Pass-through mode. When the Pass-through mode is active, the device
connected to the console port can send AT commands directly to the
Secure Rack Modem’s internal modem.
c) To exit the Pass-through mode, type
/X
and press
[Enter]
. The unit will
return to the “SRM>” command prompt.
2. Via modem port: The device connected to the Secure Rack Modem’s modem
port can also issue AT commands. Go to the secure device and start your
communications program (for example, ProComm). Make certain that the
communications program is configured to use the same COM port that is
connected to the modem.
