Dahua NVR21-4 KS2 Series, Руководство пользователя

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Front Panel and Rear Panel 50
Figure 2-70

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.

A/B cable of the RS485 is for the A/B cable connection of the speed PTZ.
2.3.4
Alarm relay specifications
Table 2-33
Model: JRC-27F
Material of the
touch
Silver
Rating
(Resistance
Load)
Rated switch capacity 30VDC 2A, 125VAC 1A
Maximum switch power 125VA 160W
Maximum switch voltage 250VAC, 220VDC
Maximum switch currency 1A
Insulation Between touches with same
polarity
1000VAC 1minute