Connecting Alarms, Supervised Alarms | Pelco SD4N-B1, SD4N-W1

CONNECTING ALARMS

The Spectra Mini IP 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, Spectra Mini IP maintains a constant electrical current through the alarm circuit (3.3 VDC, 1 kohm). 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 12 shows 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 13 and Figure 14 illustrate the wiring configuration for supervised alarm inputs.

NORMALLY CLOSED			NORMALLY OPEN
NO ALARM	1 K		NO ALARM	1 K
GND		+V	GND	+V
ALARM	1 K	+V	ALARM	1 K
GND		+V	GND	+V
ALARM	1 K		ALARM	1 K
GND	CUT	+V	GND	+V
	CUT			CUT
ALARM	1 K	+V	ALARM	1 K
GND		+V	GND	+V

BYPASS

Figure 12. Supervised Alarm Conditions

1 K

Figure 13. Normally Closed Supervised Alarm Input Wiring

1 K

Figure 14. Normally Open Supervised Alarm Input Wiring

C3446M (7/08)

SD4N-B1, SD4N-W1, SD4N-B1-X, SD4N-B0-X, SD4N-W0-X specifications

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