Brickcom NR-2008 User Manual page 16

No Name
1 Alarm Input
2 GND
3 Alarm Output
4 RS-485

Different models support different alarm input ports. Please refer to the specifications sheet for detailed information.

Slight difference may be found on the alarm port layout.
Examples of alarm input connections
The alarm input is the switch quantity input. If the alarm input signal is not switch quantity signal but voltage signal,
refer to the following connection:
Examples of alarm output connections
When the alarm output connect with DC and AC load, please refer to the connection.
2 4
1 3
Instructions
Connect the positive end (+) of the alarm input device to the
alarm input port (ALARM IN 1～16)
Connect the negative end (-) of the alarm input device to the
Connect the alarm device
485 communication port. They are used to control devices such
as PTZ. Please parallel connect 120TΩ between A/B cables if
there are too many PTZ decoders
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UP
DOWN
ground