Installation Manual
| VISIX PTZ Network Camera
10225 Westmoor Drive, Suite 300, Westminster, CO 80021 | www.3xlogic.com | (877) 3XLOGIC
37
Figure A-‐9 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. Refer to the following figure.
Figure A-‐10 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 baudrate of the speed
dome does not match with those of
remote control device.
1. Adjust the address and baudrate 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
dome can be
controlled
but not
smoothly.
1. The connection is loose.
1. Reconnect the RS485 wire tightly.
2. RS485+ or RS485-‐wire is broken.
2. Change a RS485 wire.
3. The speed dome is too far away from
the remote control device.
3. Add a terminal resistor.
4. Too many speed domes are
connected.
4. Add a RS485 distributor.
6#
主控
设备
1#
32#
15#
120Ω
120Ω
120Ω
1#
2#
16#
A
+
B
-
485
分配器
Controller
Device
RS485 Distributor