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C2655M-A (10/08) 21
Figure 17. Connecting a Relay Device
CONNECTING ALARMS
The NET5308T-EXP offers eight alarm inputs for external signaling devices, such as door contacts or motion detectors. Each alarm input can be
either normally open or normally closed, either supervised or unsupervised.
Once configured, an alarm input can invoke many different activities, including triggering a relay device, sending an alert to a security office,
changing the video recording settings, and storing pre-alarm video to an NVR5100 Series network video recorder or other Endura video recorder.
You can connect switches or contacts directly to the unit without a separate power supply.
SUPERVISED ALARMS
When an alarm is configured as a supervised alarm, the NET5308T-EXP maintains a constant electrical current through the alarm circuit (5.0 VDC,
10 kohms), including a 10-kohm resistor. If the resistance changes, due to an electrical short or a bypass, the voltage fluctuates from its normal
state. Therefore, the unit triggers an alarm.
Figure 18 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 18. Supervised Alarm Conditions
A5 A6 A7 A8
100-200 VAC - 50/60 HZ
0.7 AMP
NO
C
NC
NO
C
NC
LOAD:
LIGHT/SIREN
EXTERNAL
FUSE
NO
C
POWER
MAX: 30 VDC, 2 A
125 VAC, 0.5 A
NORMALLY OPEN
NORMALLY CLOSED
ALARM
GND
+V
+V
ALARM
GND
+V
+V
ALARM
GND
CUT
NO ALARM
GND
ALARM
GND
+V
+V
+V
+V
ALARM
GND
BYPASS
CUT
BYPASS
NO ALARM
GND
ALARM
GND
10 K
Ω
10 K
Ω
10 K
Ω
10 K
Ω
10 K
Ω
10 K
Ω
10 K
Ω
10 K
Ω