ZETRON 025-9581M, Installation And Maintenance Manual

Page: 23 / 196

23
Station Transponder Unit Functions
PA Control
The Station Transponder Unit has two dedicated relays for controlling a Fire Station PA
system. They are used to enable the PA system either when commanded to do so by the
FSA Server, or locally using the handset in the Station Transponder Unit. The Station
Transponder Unit typically uses the PA to play alert tones and dispatcher messages. When
alert tones and messages are not being generated, these relays are de-energized, and an
auxiliary audio input can be routed through them to the PA system. A handset connected
to an Station Transponder Unit can be used to take local control of PA system for
broadcasting an internal message.
Relays
Besides the dedicated relays used for PA management, the Station Transponder Unit has
four general-purpose relays that can be used for a variety of user-defined tasks. These
relays can be remotely controlled from the FSA Console (i.e. buttons on the FSA Console
user interface are programmed to energize or de-energize relays at the Station
Transponder Unit). These relays may also be automatically controlled by the Station
Transponder Unit based on user configurable parameters (for example, to energize when
unit “n” is alerted and de-energize “m” seconds later). The relays can also be manually
energized, at the Station Transponder Unit, by using an external contact closure. The
programmable parameters are set with the Station Configuration Utility. (See
Serial Port
Programming on page 60.) These enable the relays to be activated by selected alerts and
deactivated by the acknowledgment of the alert, turned on and off by a timer, or controlled
by the change of state at one of the sense inputs.
Sense Inputs
Each Station Transponder Unit has four opto-isolated inputs that can be useful for status
monitoring. Whenever there is a change of status at one of these inputs, the Station
Transponder Unit transmits this change back to the FSA Server and from there to the FSA
Console clients. The FSA Console can be configured so that its screen shows the current
status of the inputs for an individual station. Any change at these inputs is also reported to
the CAD interface.
Sense inputs can also be associated with individual relays. This is user configurable by
means of the Station Configuration Utility. (See
Serial Port Programming on page 60.)
When configured in this way, a relay can be deactivated by a change of state at one of the
Station Transponder Unit sense inputs.