Keyscan CA250B, Technical Instructions

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Keyscan Inc. – Technical Guide (PC109x - 04.15) 37
Terminate Input Wiring
The following sub-headings review termination of door, exit, and auxiliary alarm input wiring.
Door Monitoring Connections
A normally-closed door contact is for monitoring door security. Door inputs are shunted during the door relay
unlock time.
Exit Device Connections
A normally-open exit device contact unlocks its assigned door for its defined door relay unlock time and
overrides the alarm input during its defined door held open time. Examples of exit devices are exit push
buttons or motion sensors (PIR) etc.
Keyscan recommends a PIR with a pulse output of 1/2 second and suitable for its environment.
Security Monitoring Connections
A normally-closed device may be connected to an auxiliary alarm input for monitoring stairwell or interior
doors, or windows. The auxiliary alarm inputs may be connected to infrared sensors or to an existing alarm
system with a normally-closed auxiliary output relay contact.