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13
1.9 Alarm Inputs/Output (only available on specific models)
The Alarm Input/output ports are labelled on the rear panel as ‘Alarm I/O’. If you have
an alarm sensor you wish to connect to the NVR to increase the effectiveness of the
CCTV system, you can connect them to the RS485 connectors at the back. See the
diagram below on how to connect your sensor to the NVR:
RS485 Port Key:
Port Name
Description
Port Name
Description
4
Alarm Input 4
G
Ground
3
Alarm Input 3
G
Ground
2
Alarm Input 2
C
Normally Closed (Alarm Output)
1
Alarm Input 1
NO
Normally Open (Alarm Output)
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