7
5-ON C
，
6-ON C
，
7-ON C
，
8-ON C
GND cable.
A/B
The A/B cable to control the RS485 devices. It is to connect to
control devices such as PTZ dome camera.
120Ω should be parallel
connected between A, B lines on the far end to reduce reflection and
guarantee the signal quality.
2.3.2
Alarm input and output 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 NVR and the ground of the alarm detector.
Please connect the NC port of the alarm sensor to the NVR alarm input(ALARM)
Use the same ground with that of NVR if you use external power to the alarm device.
Figure 2-5
2.3.3
Alarm Output Port
Provide power to peripheral 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.
2.3.4
Alarm relay specifications
Model:
JRC-27F
Material of the
touch
Silver
Rating
（
Resistance
Load
）
Rated switch capacity
30VDC 2A, 125VAC 1A
Maximum switch power
125VA 160W
Maximum switch voltage
250VAC, 220VDC
Maximum switch currency
1A
Insulation
Between touches with same
polarity
1000VAC 1minute
Between touches with different
polarity
1000VAC 1minute
Between touch and winding
1000VAC 1minute
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