Alarm Input Port; Alarm Input And Output Port - Dahua NVR4108-P User Manual

A/B
Note

Different models support different alarm input ports. Please 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 (
Note

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
( ).

Connect the NC port of the alarm device to the alarm input port (ALARM) of the NVR.

When there is peripheral power supplying for the alarm device, please make sure it is earthed with
the NVR.

2.3.3 Alarm input and output port


There is peripheral power supplying for the external alarm device.

In case overload may result in NVR damage, please refer to the following relay specifications for
detailed information.
GND
485 communication port. They are used to control devices
such as PTZ. Please parallel connect 120TΩ between A/B
cables if there are too many PTZ decoders.
Figure 2-41
) of the NVR.
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