DVR systems DVRxx04HF-U Series - Manual (Page 47)

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+12V It is external power input. Need the peripheral equipment to provide
+12V power (below 1A).
Earth cable.
485 A/B 485 communication port. They are used to control devices such as
decoder.
T+,T-,R+,R- They are four-wire double duplex RS485 port
T+ T-: output wire
R+ R-: input wire
3.8.2 Alarm Input Port
Please refer to the following sheet for more information.
z
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 Use the same ground with that of DVR if you use external power to the alarm device.
Figure 3-7
3.8.3 Alarm Output Port
z Provide external power to external alarm device.
z To avoid overloading, please read the following relay parameters sheet carefully.
z RS485 A/B cable is for the A/B cable of the PTZ decoder.
z
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 Rated switch capacity 30VDC 2A, 125VAC 1A