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Dahua Network Video Server
User’s Manual
12
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 NVS and the ground of the alarm detector.
Please connect the NC port of the alarm sensor to the NVS alarm input(ALARM)
Use the same ground with that of NVS if you use external power to the alarm device.
Figure 3-4
3.6.3 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.
T+,T-,R+,R-
are four-wire double duplex RS485 port.
T+ T-: output wire
R+ R-: input wire
Relay Specification
Model:
JRC-27F
Material of the
touch
Silver
Rating
(
Resistance
Load
)
Rated switch capacity
30V DC 1A, 125V AC 0.5A
Maximum switch power
62.5VA/30W
Maximum switch voltage
125V AC
,
60V DC
Maximum switch currency
2A
Insulation
Between touch and loop
1000V AC 1minute
Length of open
time
3ms max
≤
5ms
Length of close
time
3ms max
≤
5ms
Longevity
Mechanical
次
(300 times/MIN)
Electrical
次
(30 times/MIN)