Specifications

Pelco Manual C1920M-D (4/03) 15
Figure 10. Alarm Wiring Example
Alarm inputs require a ground signal through a contact opening or closure, such as a switch
or relay.
To wire the alarm inputs (refer to Figure 10):
1. Connect one wire from the alarm source (for example, door) to one of the alarm input
pins of the multiplexer. The alarm input must correspond to the camera input. There is
only one alarm input per camera.
You can pull the eight-pin plug-in terminal blocks out of the connectors on the back of
the multiplexer to make wiring easier.
2. Connect a second wire from the alarm source to one of the ground connections on the
six-pin plug-in terminal block on the back of the multiplexer.
3. If your VCR has an alarm input to change the VCR to its alarm recording speed when
the multiplexer receives an alarm, connect the VCR alarm input to the normally open
(N.O.) relay contact on the multiplexer. Connect a wire from the relay’s common (C)
connection to ground on the VCR.
VCR
AUX
MAIN
SPOT
SVHS
OUT IN
SVHS
IN COM OUT
NNH
OC
C
S
ALARMS
12345678 91011 14151612 13
110-240V 50/60 Hz
5 ALARMS
VCR
AUX
MAIN
SPOT
SVHS
OUT IN
SVHS
IN COM OUT
NNH
OC
C
S
ALARMS
12345678 91011 14151612 13
O
N
O
N
1234
1234
KBD4000
MULTIPLEXER
110-240V 50/60 Hz
6
(OPTIONAL) KBD4000/KBD4002 KEYBOARD
Figure 11. Connecting the Keyboard to the Multiplexer