Справочник Пользователя для Pelco C3432M-F
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.
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.
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.
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
+V
+V
ALARM
GND
+V
+V
ALARM
GND
CUT
NO ALARM
NO ALARM
GND
ALARM
GND
+V
+V
+V
+V
ALARM
GND
BYPASS
CUT
BYPASS
GND
ALARM
GND
1 K
1 K
1 K
1 K
1 K
1 K
1 K
1 K
NORMALLY CLOSED
UNUSED
INPUTS
MUST ALSO
BE WIRED
INPUTS
MUST ALSO
BE WIRED
NORMALLY OPEN
UNUSED
INPUTS
MUST ALSO
BE WIRED
INPUTS
MUST ALSO
BE WIRED
1 K
Ω
1 K
Ω
1 K
Ω
1 K
Ω
1 K
Ω
1 K
Ω