4 Channel Digital Video Recorder
7
3. Alarm and Sensors Connection
(Requires professional installer)
The DVR can support up to 4 alarms input and 3 alarms output.
Alarm input:
There are two types of alarm input.
1. Voltage output
（
5V and 0V
）
A: In case the sensor output is high voltage (5V) normally and output is low voltage when
triggered (0V), then users must set the DVR for low voltage alarm.
B: In case the sensor output is low voltage (0V) normally and output is high voltage when
triggered (5V), then users must set the DVR for high voltage alarm.
Refer to the diagram below; Ch 2 to Ch 4 connectivity is similar to that for channel 1.
2. Open/Close output
A: N.O. Normal Open; closes when triggered. DVR must be set as low voltage alarm.
B: N.C. Normal Close; opens when triggered. DVR must set as high voltage alarm.
Please refer to the diagram below; Channel 2 to Channel 4 are similar to Channel 1.