Keyscan Technical Guide (PC109x - 04.12)
163
Appendix H – Pre-alert
Relay
The optional pre-alert relay advises when a door remains open at the half interval of the Door Held Open Time
/ Exit Delay field in the Client software. 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.
Table 33 – OCB-8 Power Specifications
Unit Power Notes
OCB-8 12 VDC, 230 mA
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 34 – 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”.
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