19
3-NO C
button).
Earth cable.
3.7.1.2
AVR-1704/AVR-1708
The interface is shown as in Figure 3-2.
Figure 3-2
1
，
2
，
3
，
4
ALARM 1 to ALARM 4. The alarm becomes active in low voltage.
NO1 C1
，
NO2 C2
，
NO3 C3
，
There are three groups of normal open activation output (on/off
button)
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 3-3
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