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CONNECTING ALARMS
The NET5400T Series offers three alarm inputs for external signaling devices, such as door contacts or motion detectors.
Each encoder supports both normally open and normally closed devices. Each encoder also supports both supervised and
unsupervised alarms.
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 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 unit 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 10 kohm resistor as close to the switch as possible.
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
NORMALLY OPEN
NORMALLY CLOSED
ALARM
GND
+V
+V
ALARM
GND
+V
+V
ALARM
GND
CUT
NO ALARMNO ALARM
GND
ALARM
GND
+V
+V
+V
+V
ALARM
GND
BYPASS
CUT
BYPASS
GND
ALARM
GND
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