HIKVISION Network Speed Dome User Manual page 127

User Manual of Network Speed Dome
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.
 Troubleshooting of RS485 communication
Problem
The speed
dome does
the
self-test
action but
cannot be
controlled
remotely.
The speed
dome can
© Hikvision
32#
Figure A-9 Star Shape Connection
A+
B-
Figure A-10 RS485 Distributor
Possible Reasons
1. The address or baudrate of the
speed dome does not match with
those of remote control device.
2. The wire RS485+ connects to
the interface RS485- and wire
RS485- connects to the interface
RS485+.
3. The RS485 wire is
disconnected.
4. RS485 wire is broken.
1. The connection is loose.
1#
15#
RS485 Distributor
120Ω
120Ω
120Ω
1. Adjust the address and
baudrate of the remote control
device to match with those of the
speed dome.
2. Connect the wire RS485+ to the
interface RS485+ and wire RS485-
to the interface RS485-.
3. Reconnect the RS485 wire
tightly.
4. Change a RS485 wire.
1. Reconnect the RS485 wire
tightly.
126
6#
Controller
1#
2#
16#
To Solve the Problem