Pre-Alert Output Relay; Table 8 - Pre-Alert Relay To Door Assignments - Keyscan CA250 Series Technical Manual

Pre-alert Output Relay

The OCB-8 may be used for pre-alert relays which trip when doors remain open at the half interval of the
combined door relay unlock time and door held open time in the Client software. This function is a feature
within the control board. The OCB-8 pre-alert relay connects to an external device. The Pre-alert relay is
optional on CA4500B or CA8500B control boards and requires an additional OCB-8 purchased separately.
Note
A reader with a pre-alert conductor connected to the C1 (Beep) reader terminal will beep intermittently at
the half interval as well. The reader will also sound on an alarm tripped.
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.
Control Board/OCB-8
CA250B/OCB-8
CA4500B/OCB-8 (optional)
CA8500B/OCB-8 (optional)
Important
All relays on the OCB-8 board are dedicated as pre-alert output relays when connected on the CA8500B
circuit board.
The pre-alert relay also activates on an "alarm tripped".
Keyscan Inc. – Technical Guide (PC109x - 07.15)
Table 8 – Pre-alert Relay to Door Assignments
Pre-alert Pre-alert Relay
Outputs # on OCB-8
2 Relay 7 (K7)
Relay 8 (K8)
4 Relay 5 (K5)
Relay 6 (K6)
Relay 7 (K7)
Relay 8 (K8)
8 Relay 1 (K1)
Relay 2 (K2)
Relay 3 (K3)
Relay 4 (K4)
Relay 5 (K5)
Relay 6 (K6)
Relay 7 (K7)
Relay 8 (K8)
Door Ribbon Cable Connection
Contact
#
Door 1 Connect ribbon on OCB-8 to control
1 on CA250B
Door 2
Door 1 Connect ribbon on OCB-8 to control
2 on CA4500B.
Door 2
Door 3
Door 4
Door 1 Connect ribbon on OCB-8 to control
3 on CA8500B.
Door 2
Door 3
Door 4
Door 5
Door 6
Door 7
Door 8
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