Dante DLI1971, Инструкция по установке и эксплуатации, Страница: 28 / 28

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Problems in practical connection
In some circumstances user adopts a star
configuration in practical connection. The
termination resistors must beconnected to the two
equipment 1# and 5# in picture 9-4.4. As the star
configuration is not in conformity with the
requirements of Rs485 standards,problems such as
signal reflections, lower anti-
interferenceperformance arise when the cables are
long in the connection. The reliability of control
signals isdecreasedwiththephenomenathat the dome
does not respond to or just responds at intervals
tothe controller, or does continuous operation
without stop.
Trouble
Possible cause
So lution
Dom e can
do s elf-testing
but cannot
be c ontrolled
The dome can
be controlled
but the operation
is not smooth
A Chage the address and baud rat e of controller or dom e
B Adjust the + and -connection of Rs485
C Make sure the connections are fully seated
D Change Rs485 Bus wires
、
、 ；
、 ；
、
A Secure the connection
B Replace Rs485 bus wires
C Add termination resistors to the system
D Install Rs485 distributor
、 ；
、
、
、
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Rs485Bus troubles shooting
Rs 4 8 5 Di s t r ib u t o r
B -
1 #
2 #
3 #
1 2 0 Ω
1 2 0 Ω
1 2 0 Ω
A +
P i ctu r e 8-4 . 5
1#
3 2 #
1 5#
6 #
Ma in c on t ro ll e r
P i ct u r e 8- 4 . 4
12 0 Ω
1 2 0 Ω
In such circumstances the Factory recommends
the usages of Rs485 distributor. The distributor can
change the star configuration connection to the mode
of connection stipulatedin the Rs485 standards. The
new connection achiev es reliable data transmission .
(Refer to picture 9-4.5)
A The address and baud rate setting of dome
are not in conformity with those of controller.
B The + and - connection of Rs485 Bus is incorrect
C bad connection
D there are circuit in the Rs485Bus
、
、
、
、 。
A the Rs485Bu s is not in good contact with the connectors
B One wire of Rs485bus is broken
C The dome is very far from controller
D There are two many domes conn ected i n the system
、
、
、
、
2 5
Appendix