AGI Security SYS-HC0851S2 - Manual (Page 60)

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Voltage current；500mA.
+12V Rated current.
Voltage current；500mA.
Earth cable.
485 A/B 485 communication port. They are used to control devices such as
decoder. 120Ω should be parallel connected between A, B lines if
there are too many PTZ decoders.
T+,T-,R+,R- They are four-wire full-duplex RS485 port
T+ T-: output wire
R+ R-: input wire
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 alar m 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.

T+,T-,R+,R- are four-wire double duplex RS485 port.
T+ T-: output wire
R+ R-: input wire
Relay Specification
M odel: JRC-27F