COP-USA DVRC264-4CH_USB - Manual (Page 17)

Digital Video Recorder User Manual
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Fig 2.8 Sensor Connection
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 2.8.
N O  
COM
N C  
N O  
COM
N C  
Before alarm 
After alarm
Fig 2.9 Relay Output Status
Users need connect their alarm according to the NO or NC type of the alarm. One connection example as Fig 2.1