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Page 24
2.5.3
Alarm Relay and Addressable Contact Closures
The rear panel has an alarm relay and two network-controlled solid-state contact closures
addressable from the COMPELª uplink computer. The alarm relayÕs ÒalarmÓ conditions are the
same as the front-panel ALARM LED. The alarm relay is factory-set so that an alarm condition
or the loss of unit power will cause the rear panel alarm outputs to short together (alarm relay
closed). Ratings for the alarm relay and network-controlled closures are 100 Ma at 30 VDC.
The two contact closures are controlled via the COMPEL command stream from the uplink. See
the COMPELª Manual for the commands and structure for the relay closures.
UTY4000-011
Page 24 of 75
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