Dahua HCVR8204A-S3, User Manual

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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 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 3-2
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
3.7.4 Alarm Output Relay Parameters
Note
Refer to the actual product for relay model information.
Relay Specification
Model HFD23/005-1ZS HRB1-S-DC5V
Material of the touch AgNi+ gold-plating AuAg10/AgNi10/CuNi30
Rating
(Resistance
Load
）
Rated switch
capacity
30V DC 1A/125V AC 0.5A 24V DC 1A/125V AC 2A
Maximum 62.5VA/30W 250VA/48W