User Manual

HD-TVI Speed Dome User Manual
37
Figure A-4 Star Shape Connection
For such case, the best way is adding a RS485 distributor. This product can effectively change the
star-shape connection to which satisfies the requirement of RS485 industry standard, in order to
avoid those problems and improve the communication reliability. Show as figure 5.
Figure A-5 RS485 Distributor
 Troubleshooting of RS485 communication
Problem Possible Reasons To Solve the Problem
The speed
dome does
the
self-test
action but
cannot be
controlled
remotely.
1. The address or baud rate of the
speed dome does not match with
those of remote control device.
1. Adjust the address and baud
rate of the remote control device
to match with those of the speed
dome.
2. The wire RS485+ connects to
the interface RS485- and wire
RS485- connects to the interface
RS485+.
2. Connect the wire RS485+ to the
interface RS485+ and wire RS485-
to the interface RS485-.
3. The RS485 wire is
disconnected.
3. Reconnect the RS485 wire
tightly.
4. RS485 wire is broken. 4. Change a RS485 wire.
The speed 1. The connection is loose. 1. Reconnect the RS485 wire