基于CAN总线的分布式测量系统研究

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1、重庆大学硕士学位论文基于CAN总线的分布式测量系统研究姓名：彭义申请学位级别：硕士专业：仪器科学与技术指导教师：高潮20050401重庆大学硕士论文英文摘要AbstractFieldbusisadigital,bi-directionalandmulti-branchcommunicationnetworkthatconnectsfieldequipmentsandautomaticsystem.Asaproductintegratingtechnologyofcomputer,communic

2、ationandcontrol,thefieldbusfeaturedwithopeninganddistributionhasbeenoneofthekeytechnologiesinmodernautomatismfield.Asoneofthefieldbuses,CAN(ControllerAreaNetwork)isaserialcommunicationnetworkthatsupportsdistributedandrealtimecontroleffectively.CANver

3、yfitsinterlinkageofmonitorandcontrolequipmentsinindustryprocessandhasbeenwellacceptedasthemostperspectivefieldbus.AdistributedmeasurementandcontrolsystemwasdevelopedbasedonCANfieldbus.Thetechnologiesinsomefieldsincludingcomputer,control,communication

4、,networkandcircuitdesignwereusedwhichenableacomparativelyrichfunctionsinmonitorandcontrol,inadditiontostableperformanceandfriendlyinterface.ResearchcontentincludestheresearchonhardwareofnodeandCAN-PCinterfacecard,softwarebothrunningonnodeandinterface

5、card,andsoftwarerunningonPCformonitorandcontrolofCANnetwork.PIC16F877singlechipcomputerandMCP2510CANcontrollerarethemainelementsofNodeandInterfaceCard.Everynodehas4ADinputsand8switchoutputs.Themaximum110nodesonaCANbuscommunicatewithPCthroughinterface

6、card.MonitorandcontrolsoftwarerunningonPCisdesignedwithobject-orientedmethod.Thephysicalexistednodeismappedtoaninstanceofnodeclass,sothemonitorandcontroltonodearealsomappedasthecallingofnodeclass’smethods.Alldataandsettingaresupportedbydatabase.Thefu

7、nctionofonlineaddingandremovingofnodesonCANbusareachievedbyeventtriggermechanism.ThePCsoftwarecanmonitorallsensorsandcanshow,printthehistorycurvesofwhich.PCsoftwarealsocancontrolthe8switchesofallnodesbycalltheremotecontrolmethodofnodeclass.Theadjustm

8、entofsensorisimplementedinPCinsteadofnodethatovercomesthedisadvantagesofinconveniencyandinefficiencyofwritingadjustmentdatatonode.Thissystemisauniverseproductthatcanbeusedinvariedsituationwithdifferentsensors.Themaincontentofthisthesisisasfollowing:I