Pelco C3432M-F User Manual download pdf (Page 16)

16 C3432M-F (6/08)

CONNECTING ALARMS

The IP110 Camclosure provides an alarm input for external signaling devices, such as door contacts or

motion detectors. Both normally open and normally closed devices are supported.

Supervised Alarms

When an alarm is configured as a supervised alarm, IP110 Camclosure maintains a constant electrical

current through the alarm circuit (3.3 VDC, 1 ohm). If the alarm circuit length changes, due to an electrical

short or a bypass, the voltage fluctuates from its normal state. Therefore, the unit triggers an alarm.

NOTE: Install the 1 kohm resistor as close to the switch as possible.

Figure 10 illustrates the alarm and no alarm conditions of a supervised alarm input. Whether the alarm is

normally closed or normally open, neither a cut nor a bypass can defeat these alarms.

Figure 10. Supervised Alarm Conditions

Figure 11 illustrates the wiring configuration for supervised alarm inputs.

Figure 11. Supervised Alarm Input Wiring

NORMALLY OPEN

NORMALLY CLOSED

ALARM

GND

ALARM

GND

ALARM

GND

CUT

NO ALARMNO ALARM

GND

ALARM

GND

ALARM

GND

BYPASS

CUT

BYPASS

GND

ALARM

GND

NORMALLY CLOSED

UNUSED

INPUTS

MUST ALSO

BE WIRED

NORMALLY OPEN

UNUSED

INPUTS

MUST ALSO

BE WIRED

1 K

1 KΩ

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 39 40

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Pelco C3432M-F User Manual Page 16

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