COP-USA DVRPRO04 - Manual (Page 61)

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Figure 11-2 Pin definitions
Click "DI/DO" in Settings to set related functions
Figure 11-3: DIO setting
Input Settings
Each camera has a corresponding sensor input. This sensor input must be of
the dry contact closure type, with a voltage of less than 5V.
Depending on their attributes, the sensors can be set to Normal Open (NO)
or Normal Closed (NC) according to the users’ application requirements.
Normal open, NO
When the sensor is of the NO type, DI is connected to the NO connec-
tion of the sensor and GND is connected to the COM connection of the
sensor. When the alarm is triggered, the circuit connected to the
alarm sensor input of the DVR will be closed.