Dahua HCVR21**HS-S2 Series, User Manual

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HDCVI Series DVR User
’s Manual
99
Please refer to the specifications for the alarm input and output channel amount. Do not merely
count the alarm input and out channel amount according to the ports on the rear panel.
The following interface is based on the HCVR7108HE series. See Figure 3-1.
Figure 3-1
1
，
2
，
3
，
4
，
5
，
6
，
7
，
8
，
9
，
10
，
11
，
12
，
13
，
14
，
15
，
16
ALARM 1 to ALARM 16. The alarm becomes active in low voltage.
NO1 C1
，
NO2 C2
，
NO3 C3
，
Three normal open groups (on/off signal)
Earth cable.
3.7.2 Alarm Input Port
Please refer to the following sheet for more information.

Grounding alarm inputs. Normal open or Normal close type)

Please parallel connect COM end and GND end of the alarm detector (Provide external power to the
alarm detector).

Please parallel connect the Ground of the DVR and the ground of the alarm detector.

Please connect the NC port of the alarm sensor to the DVR alarm input(ALARM)

Use the same ground with that of DVR if you use external power to the alarm device.
Figure 3-2
3.7.3 Alarm Output Port

Provide external power to external alarm device.

To avoid overloading, please read the following relay parameters sheet carefully.

RS485 A/B cable is for the A/B cable of the PTZ decoder.