Danbit H.264 DVR - Alarm-In Connection

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2.4. ALARM-IN CONNECTION
D+
RS-485: sends +/ receives
+
D -
RS-485: sends -/ receives -
GND
Ground
ALARM IN 1-8
Alarm input
N.C
Relay: Normally close
N.O
Relay: Normally open
COM
Relay: Common