When configuring a Circuit Module for the Monitor Mode, note
·Only one Circuit Module may be configured for the Monitor
Mode at a given time.
·The Monitor Mode can provide automated A/B switching of
up to sixteen Circuit Modules, or can send a Notify Message
without switching A/B paths.
·When an external modem is installed at the Control Module
RS232 Port, the Notify Message can be defined as an AT
command. This allows the AFS-16 to dial a remote modem
or pager when critical conditions are detected.
When the Monitor Mode is properly configured and enabled, the
AFS-16 will watch the signal received via the AUX port. If the
signal matches the user specified critical level (Switch if
Level =), the switch/notify routine will automatically begin.
In addition to monitoring the AUX connector, Circuit
Modules can also be supplied in a version that allows
monitoring signal conditions at the "C" (Common)
connector. Please consult WTI Customer Support for
To configure the AFS-16 for automated A/B switching, proceed
1. Select a Circuit Module to be used for Monitoring setup
purposes. Any one of the installed Circuit Modules can be
used. Note that the Monitor Jumper, located on the Circuit
Module card, must be installed (see Section 3.4).
2. Remove the Control Module from the frame unit and set
the Monitor Input Level Jumper to select the appropriate
"normal" signal type. The Jumper can be set to force AUX
Port Pin 4 to normally high (1) or normally low (0).
Replace the Control Module.
3. Connect your signal line to the AUX connector on the back
edge of the Control Module board. The AUX connector
can be accessed via an opening in the back of the frame
unit. For a description of the AUX port interface, please
refer to Appendix A. Note that AUX Port Pin 4 will accept
signals from -20 volts to +20 volts at 5 ma maximum.