帶有RS485轉換功能的一類網卡設計與實現(xiàn).pdf

1、大連理工大學碩士學位論文帶有RS485轉換功能的一類網卡設計與實現(xiàn)姓名：劉濤申請學位級別：碩士專業(yè)：檢測技術與自動化裝置指導教師：王偉20061217大連理工大學碩士學位論文DesignandImplementationofClassOneNetworkAdaptorwithRS485TransitionFunctionAbstractNowadays，itisallinevitabletrendthatthenewgeneration

2、trainisdevelopingtowardtheaimof11ighspeedandautomationTrainCommunicationNetwork(TCN)hasbecomeoneofthekeyteetmologieswhichaleappliedtothecontrolsystemofhighspeedelectricaltrainThereiSnodoubtthatthedevicesconformingtOthein

3、ternationalstandardofTCNwillhaveaverypromisingprospectAccordingtothestandardofIEC61375thearchitectureofTCNiSdefmedasahierarchywhichconsistsoftwolevelstheyareWiredTminBus(WTB、andMuhifunetionVehicleBus(MVB)Asarecommendator

4、ystandardofIEC61375theMVBiSmoreandmoreappliedinlocomotivesandvehiclesAdevicemustconnecttoaspecialMVBnetworkadaptorwhenitiScommunicatingwithMVBHowevertherealestillsomedevicesbasedonRS485becauseofseveralreasonsSohowtealize

5、thedatatransmissionbetweenthesestwokindofdevicesisbecomingaproblemneededtObesolvedassoonaspossibleFirst，thisthesisdeeplyanaly∞stheMVBandRS485busandthecharacteristicsoftheircommunicationThenitgivestheimplementationoftheda

6、tatransitionbetweenRS485busandMVBbasedonFPGAandAT89S52platformTheFPGAisresponsibleforthecommunicationwithMVBwhiletheMCUiSresponsibleforthecommunicationwithRS485bus11艙transmissionandcontrolofdataiSrealizedthroughtheconnec

7、tionofaddressbusanddatabusbetweenFPGAandMCUTheFPGAiSdesignedasaMVBcontrollerwhichconsistsofManchesterencoderManchesterdecoderbuffercentercontrolunitinternalmemory，MCUinterfaceand∞onT1lispaperdefinessevenkeywordswhichCanb

8、eusedtOaccesstheMVBcontrollerbvMCUUserCanprogramtheMCUaccordingtOdifferentprotocolinRS485bustealize也edatatransmissionbetweenthesetwokindsofbusThroughthedesignofschemeandPCB，thenetworkadaptorisimplementedandiSperformedthr