65
In such circumstances the factory recommends the usage of a DR-HB16 RS485
distributor. The distributor can change the star configuration connection to the
mode of connection stipulated by the RS485 standards.
The new connection achieves reliable data transmission (refer to following picture).
5. RS485 Bus Troubleshooting
TROUBLE POSSIBLE
CAUSES
SOLUTION
The dome carries
out Self-Test but
cannot be
controlled
1. The address and baud rate
settings are not coordinated
with those of the controller.
2. The ‘+’ and ‘-’connection in
the RS485 Bus is incorrect.
3. The writing is not fully
seated.
4. There is a breakage in the
middle section of the RS485
Bus.
1. Change the address and
baud rate of the dome or the
controller.
2. Correct the connection.
3. Make sure the connections
are fully seated.
4.
The dome can be
controlled but the
operation is
unstable.
1. The RS485 Bus is not in
proper contact with the
connectors.
2. One wire of the RS485 Bus
is broken.
3. The dome is very far away
from the controller.
4. There are many more
domes connected in the
system than is advised.
1. Secure the connection.
2. Replace the RS485 wires.
3. Add termination resistors
to the system.
4. Install a Rs485 Distributor.
Summary of Contents for QT-220EX
Page 1: ...1 QT 220EX 26X Day Night PTZ Dome USER S MANUAL Document Version 1 1 October 06 2005...
Page 9: ...9 Surface Mount Bracket Mount 1 Wall Mount 2 Corner Mount 3 Pole Mount 4 Pendant Mount...
Page 34: ...34 3 2 MENU TREE...
Page 58: ...58...
Page 59: ...59...
Page 67: ...67...
