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HD-TVI 23x Zoom PTZ Camera User Manual
PRELIMINARY
APPENDIX B: RS-485 BUS CONNECTION
A+
B–
120 Ω
120 Ω
120 Ω
120 Ω
120 Ω
120 Ω
120 Ω
#1
#16
#2
Star-shaped network with an RS-485 Distributor
FAQ of RS-485 Bus
Fault
Probable Cause
Solutions
The camera will perform a self
check but cannot be controlled.
The address or baud rate is not configured
appropriately in the camera or controller.
Configure the camera address and baud rate to
match in the controller and the camera.
RS-485 +/- are connected incorrectly.
Correct the RS-485 wiring connections.
Wiring is disconnected
Fastening the wire
RS-485 wire is broken
Change the RS-485 wires
The camera can be controlled but
does not operate smoothly.
Loose wire connections
Fasten the RS-485 wires correctly
One RS-485 wire is broken
Change or repair the broken wire
Controller and camera are too far away
Add terminal matched resistance
Too many devices are connected to the network
Add an RS-485 distributor.
