HIKVISION DS-2DP1636Z-D User Manual page 119

For such case, the best way is adding a RS-485 distributor. This product can effectively change the
star-shape connection to which satisfies the requirement of RS-485 industry standard, in order to avoid
those problems and improve the communication reliability. Refer to the following figure.
 Troubleshooting of RS-485 communication
Problem
The camera
does the
self-test
action but
cannot be
controlled
remotely.
The camera
can be
controlled
but not
smoothly.
User Manual of PanoVu Series Network Camera
32#
Figure A.6.3 Star Shape Connection
A+
B-
Figure A.6.4 RS-485 Distributor
Possible Reasons
1. The address or baudrate of the
camera does not match with
those of remote control device.
2. The wire RS-485+ connects to
the interface RS-485- and wire
RS-485- connects to the interface
RS-485+.
3. The RS-485 wire is
disconnected.
4. RS-485 wire is broken.
1. The connection is loose.
2. RS-485+ or RS-485-wire is
broken.
3. The camera is too far away
from the remote control device.
4. Too many cameras are
connected.
1#
15#
RS485 Distributor
120Ω
120Ω
120Ω
1. Adjust the address and
baudrate of the remote control
device to match with those of the
camera.
2. Connect the wire RS-485+ to
the interface RS-485+ and wire
RS-485- to the interface RS-485-.
3. Reconnect the RS-485 wire
tightly.
4. Change a RS-485 wire.
1. Reconnect the RS-485 wire
tightly.
2. Change a RS-485 wire.
3. Add a terminal resistor.
4. Add a RS-485 distributor.
6#
Controller
1#
2#
16#
To Solve the Problem
112