Dahua HCVR21**HS-S2 Series, User Manual

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HDCVI Series DVR User
’s Manual
100

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 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
Surge voltage
Between touches with same
polarity
1500V (10×160us)
Length of open
time
3ms max
Length of close
time
3ms max
Longevity
Mechanical 50×106 times (3Hz)
Electrical 200×103 times (0.5Hz)
Temperature -40
℃
~+70
℃
3.8 RS485
When the DVR receives a camera control command, it transmits that command up the coaxial cable to the
PTZ device. RS485 is a single-direction protocol; the PTZ
device can’t return any data to the unit. To enable
the operation, connect the PTZ device to the RS485 (A,B) input on the DVR.
Since RS485 is disabled by default for each camera, you must enable the PTZ settings first. This series
DVRs support multiple protocols such as Pelco-D, Pelco-P.
To connect PTZ devices to the DVR:
1. Connect RS485 A,B on the DVR rear panel.
2. Connect the other end of the cable to the proper pins in the connector on the camera.
3. Please follow the instructions to configure a camera to enable each PTZ device on the DVR.
3.9 Other Interfaces
There are still other interfaces on the DVR, such as USB port.