Digital Video Recorder User Manual
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For example, a sensor is connected with alarm input 1. If the sensor gives relay out (switch on/off), users need to set the
sensor according to the switch status at alarm. If the switch is open at alarm, users need to set SENSOR TYPE to be NC
(Normal Close). Cable A and B will be disconnected once the sensor detects event. It will 5V (high level) to sensor
1 when events happen. DVR is triggered and starts to record and output alarm.
Fig 2.9 Alarm status
Alarm output:
The DVR has 4-channel relay alarm output, which just give on/off signal to external alarm. The status of these pin are
illustrated as Fig. 2.10.
N O
. .
COM
N C
. .
N O
. .
COM
N C
. .
Before alarm
After alarm
Fig 2.10 Relay Output Status
