ARM Electronics DVR4CD - Manual (Page 16)

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Alarm / Relay / PTZ Connection
A L A R M
A l ar m I np ut
1N1 1N2 1N3 c onn ec t s en so r in put b y c han ne l
GND Co nne c t to G rou nd s ys te m
A l ar m O ut pu t
NO , NC A ft e r c he c ki ng A l ar m out put ty pe ( N orma l O pe n or
NO , NC N or mal C lo se ) a nd c onn ec t to N o , N C
RS-485
C on ne ct P T Z ca me ra D + , D - C onn ec t PTZ c a me ra c ont rol li ne
( + , - te rm in al )
Power Connection
Finishing Connection