Exterior NVR21 Series, User Manual

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66
Figure 2-40
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.

A/B cable of the RS485 is for the A/B cable connection of the speed PTZ.
2.3.4
Alarm relay specifications
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