Western Telematic SRM-100 - Manual (Page 40)

9. Modem Command Set (AT Commands)
In addition to the SRM'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 SRM'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 SRM'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 SRM'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 SRM's internal modem proceed as follows:
1. Via Console Port: Access the SRM command Mode as described in Section 5.1.1.
a) When the "SRM>" command prompt appears, type /U and press [Enter] to display
the SRM 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 SRM'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 SRM's Modem Port can also issue AT
commands. Go to the secure device and start your communications program (e.g.
ProComm). Make certain that the communications program is configured to use the same
COM port that is connected to the SRM.
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