1 NVR Overview
Figure 1-5
Note
• The alarm inputs are Normally Open (NO).
• When connecting the ground port of the alarm device to the NVR, you can use either of the GND
ports ( ).
• When there is peripheral power supplied for the alarm device, please make sure it is grounded
with the NVR.
1.3.3 Alarm Input and Output Port
• There is peripheral power supplied for the external alarm device.
• To avoid an overload resulting 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.
NVR4200 Series User Guide
6
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