IC Realtime Specialty: Interrogator DVR - a DVR for law enforcement - Manual (Page 24)

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etc. You need to use a 120Ohm resistance between A/B cable if there are too
many PTZ decoder.
e) “ ”：ground cable；
You can refer to the following sheet and Figure 3-6 for alarm input and output
information.
Parameter Grounding Alarm
Ground Ground line
Alarm Input 1, 2, …,4
Relay Output 1,2,3,4: NO and C(Normally Open and Com)
5: NO,C and NC(Normally Open, Com, Normally Closed)
6: Ctrl 12V(This is used for reset the senor)
485 A、B 485 communication port. They are used to control devices
such as PTZ.
+12（C） This should input an external power input.
z 4-ch grounding alarm inputs. (Normal open or Normal close type)
z Please parallel connect COM end and GND end of the alarm detector (Provide
external power to the alarm detector).
z Please parallel connect the Ground of the DVR and the ground of the alarm detector.
z Please connect the NC port of the alarm sensor to the DVR alarm input(ALARM)
z If you need to reset the touched-off alarm remotely, you can use DVR to supply
controllable 12 V power to the alarm detector such as the smoke detector.
z Use the same ground with that of DVR if you use external power to the alarm device.