User manual

Ø Problemsinpracticalconnection
Insomecircumstancesuseradoptsastar
configurationinpracticalconnection.The
terminationresistorsmustbeconnectedtothetwo
equipment1#and5#inpicture10-4.4.Asthestar
configurationisnotinconformitywiththe
requirementsofRs485standards,problemssuchas
signalreflections,loweranti-
interferenceperformancearisewhenthecablesare
longintheconnection.Thereliabilityofcontrol
signalsisdecreasedwiththephenomenathatthedome
doesnotrespondtoorjustrespondsatintervals
tothecontroller,ordoescontinuousoperation
withoutstop.
Trouble
Possiblecause
Solution
Domecan
doself-testing
butcannot
becontrolled
Thedomecan
becontrolled
buttheoperation
isnotsmooth
AChagetheaddressandbaudrateofcontrollerordome
BAdjustthe+and-connectionofRs485
CMakesuretheconnectionsarefullyseated
DChangeRs485Buswires
、
、；
、；
、
ASecuretheconnection
BReplaceRs485buswires
CAddterminationresistorstothesystem
DInstallRs485distributor
、；
、
、
、
ØRs485Bustroublesshooting
Rs485Distributor
B-
1#
2#
3#
120Ω
120Ω
120Ω
A+
Picture10-4.5
1#
32#
15#
6#
Maincontroller
Picture10-4.4
120Ω
120Ω
InsuchcircumstancestheFactoryrecommends
theusagesofRs485distributor.Thedistributorcan
changethestarconfigurationconnectiontothemode
ofconnectionstipulatedintheRs485standards.The
newconnectionachievesreliabledatatransmission.
(Refertopicture10-4.5)
ATheaddressandbaudratesettingofdome
arenotinconformitywiththoseofcontroller.
BThe+and-connectionofRs485Busisincorrect
Cbadconnection
DtherearecircuitintheRs485Bus
、
、
、
、。
AtheRs485Busisnotingoodcontactwiththeconnectors
BOnewireofRs485busisbroken
CThedomeisveryfarfromcontroller
DTherearetwomanydomesconnectedinthesystem
、
、
、
、
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Appendix
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