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A-200 Installation Manual
36
Figure A-9 Star Shape Connection
The best way to overcome this is to add a RS485 distributor. This product can effectively change the
star-shape connection to satisfy the requirement of RS485 industry standards, thus avoiding these
problems and improving the communication reliability. Refer to the following figure.
Figure A-10 RS485 Distributor

Troubleshooting of RS485 communications
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 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. Repair the RS485 wire.
The speed
dome can
1. The connection is loose.
1. Reconnect the RS485 wire
tightly.
6#
主控
设备
1#
32#
15#
120Ω
120Ω
120Ω
1#
2#
16#
A
+
B
-
485
分配器
Controller
Device
RS485 Distributor