Dahua NVR4108-P User Manual

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GND
A/B
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.
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 ( ) of the NVR.
Figure 2-41
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.

Dahua NVR4108-P Specifications

General

Brand	Dahua
Model	NVR4108-P
Category	Network Hardware
Language	English