Front Panel and Rear Panel 15
the presence or absence of voltage. It can also be used as
power input for some alarm devices such as alarm
detectors.
Power output port. It can provide power to some peripheral
devices such as camera and alarm device. Make sure the
power supply of peripheral device shall be below 1A.
485 communication port. They are used to control devices
such as PTZ. Parallel connect 120TΩ between A/B cables if
there are too many PTZ decoders.
Different models support different alarm input ports. Refer to the specifications sheet for detailed
information.
Slight difference may be found on the alarm port layout.
2.3.2 Alarm Input Port
Connect the positive end (+) of the alarm input device to the alarm input port (ALARM IN 1–16) of the
NVR. Connect the negative end (-) of the alarm input device to the ground end ( ) of the NVR.
Figure 2-11
There are two alarm input types: NO/NC.
When connect the ground port of the alarm device to the NVR, you can use any of the GND ports
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