The VT-MODEM-2 lets field installed equipment establish a telephone link based upon a simple switch closure. This self-dialing modem adds "dial upon alarm" intelligence to any remote site. This enhanced modem is ideal for:
The Self-Dialing Modem is triggered by a switch closure or PLC output signal. It dials a pre-stored phone number and optionally identifies itself by way of a pre-stored ASCII message. Flexible features allow this modem to perform retries or even connect to alternate number until it has verified that a connection has been established. The call will terminate when:
The computer completes its polling and hangs up
The modem discrete input is turned off
A telephone line problem disrupts the call.
See Also: VT-MODEM-2 Electrical Connections