AVUE G55IR-WB36N – Outdoor 36X Long Range IR PTZ - Manual (Page 44)

Ø Problems in practical connections
In some circumstances user adopts a star co-
nfiguration in practical connection. The termina-
tion resistors must be connected to the two equi-
pment 1# and 5# in Picture 10-4.4. As the star con-
figuration is not in conformity with the require-
ments of RS485 standards, problems such as sig-
nal reflections, lower anti-interference perform-
ance arise when the cables are long in the conne-
ction. The reliability of control signals is decrea-
sed with the phenomena that the PTZ does not
respond to or just responds at intervals to the co-
ntroller, or does continuous operation without
stop.
Trouble Possible cause Solution
PTZ can do
self-testing
but cannot be
controlled
The PTZ can be
controlled but
the operation is
not smooth. A Secure the connection
B Replace Rs485 Bus Wires
C Add termination resistors to the system
D Install Rs485 distributor 、 ；
、
、
、
Ø
Rs485 Bus troubleshooting
Rs485 Distributor
B-
1#
2#
3#
120Ω
120Ω
120Ω
A+
1#
32#
15#
6#
Main controller
Picture 10-4.4
Picture10-4.5
120Ω
120Ω
A The Rs485 Bus line is not in good
contact with the connectors.
B One wire of the Rs485 Bus is
broken.
C The PTZ is very far from
controller.
D There are too many PTZ
connected in the system.
、
、
、
、
A The address and baud rate setting of PTZ
are not in conformity with those of controller.
B The "+" and "-"connection of Rs485 Bus is
incorrect.
C The PTZ is very far away from controller.
D There are too many PTZs connected in the
System.
、
、
、
、
A Change the address and baud rate of controller or PTZ
B Replace Rs485 Bus wires
C Make sure the connections are fully seated 、
、
、
In such circumstances the factory recommends
the usage of RS485 distributor. The distributor can
change the star configuration connection to the mode
of connection stipulated in the RS485 standards.
The new connection achieves reliable data transmi-
ssion. (Refer to Picture 10-4.5).
41
Appendix