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APPENDIX B: RS-485 BUS CONNECTION
A+
120 Ω
B–
FAQ of RS-485 Bus
Fault
The camera will perform a self
check but cannot be controlled.
The camera can be controlled but
does not operate smoothly.
46
120 Ω
120 Ω
120 Ω
Star-shaped network with an RS-485 Distributor
Probable Cause
The address or baud rate is not configured
appropriately in the camera or controller.
RS-485 +/- are connected incorrectly.
Wiring is disconnected
RS-485 wire is broken
Loose wire connections
One RS-485 wire is broken
Controller and camera are too far away
Too many devices are connected to the network
120 Ω
120 Ω
120 Ω
Solutions
Configure the camera address and baud rate to
match in the controller and the camera.
Correct the RS-485 wiring connections.
Fastening the wire
Change the RS-485 wires
Fasten the RS-485 wires correctly
Change or repair the broken wire
Add terminal matched resistance
Add an RS-485 distributor.
#1
#2
#16
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