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