Alarm Input Port - Dahua NVR41 Series User Manual

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A/B
● 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.
Function
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.
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User's Manual