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Page 4-4 Instruction Manual: TT1260 Standard Definition Professional Receiver/Decoder
ST.TM.E10100.1
4.4 Relays
In addition to the one summary alarm, there is an Alarm Relay Card
(TT1260/HDC/ALRM) with additional six relays. The alarm relays are
programmable to reflect the state of one or more of the individual
monitored alarm conditions. As alarm conditions may be of very short
duration (i.e. less than the time required to activate a relay) the software
ensures that any alarm condition is signalled for a minimum of one second.
The relay electrical characteristics are as follows:
All relays are configured as Single Pole Change-over Relays, with all three
contacts per relay available at the output connector. The contacts of each
relay are fully isolated from each other, and from chassis ground.
All relays are energised in the non-alarm condition, such that an alarm is
indicated upon power failure. If power returns to the unit, the alarms
should not re-energise until system boot is complete, and the alarm
condition of the various components has successfully been cleared.
See Section C.8, Alarms Menu (#5) for a complete summary of alarm
status information.
NOTE…
The Alarm Relay Card (TT1260/HDC/ALRM) is a standard component in the TT1260/DIRBAS base
unit.