Keyscan CA250B - Appendix F - Pre-Alert Relay; Pre-Alert; Table 27 - Pre-Alert Relay to Door Assignments

Keyscan Inc. – Technical Guide (PC109x - 04.15)
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Appendix F – Pre-alert
Relay
The optional pre-alert relay advises when a door remains open at the half interval of the combined door relay
unlock time and door held open time in the Client software. Reader will also sound on an alarm tripped. This
function is a feature within the control board and may be wired to an external device. To use the Pre-alert
relay option on CA4500B or CA8500B control boards, an additional OCB-8 is required.
Pre-alert
Depending on the number of doors and type of controller, ensure that the pre-alert relay on the output control
board matches the correct door contact as indicated in the following table.
Table 27 – Pre-alert Relay to Door Assignments
Control Board/OCB-8
Pre-alert
Outputs
Pre-alert
Relay # on
OCB
Door
Contact
#
Ribbon Cable Connection
CA250B/OCB-8
2
Relay 7
Relay 8
Door 1
Door 2
Connect ribbon on OCB-8 to control
1 on CA250B
CA4500B/OCB-8 (optional)
4
Relay 5
Relay 6
Relay 7
Relay 8
Door 1
Door 2
Door 3
Door 4
Connect ribbon on OCB-8 to control
2 on CA4500B.
(Relays 1 to 4 for Auxiliary Outputs
5 to 8.)
CA8500B/OCB-8 (optional)
8
Relay 1
Relay 2
Relay 3
Relay 4
Relay 5
Relay 6
Relay 7
Relay 8
Door 1
Door 2
Door 3
Door 4
Door 5
Door 6
Door 7
Door 8
Connect ribbon on OCB-8 to control
3 on CA8500B.
Important
All relays on the OCB-8 board are dedicated as pre-alert output relays when used on the CA8500B circuit
board.
The pre-alert relay is also activated on an “alarm tripped”.