类b数据通信的网络消息(1)

DRAFTSAERECOMMENDEDPRACTICEJ2178CLASSBDATACOMMUNICATIONNETWORKMESSAGESPART4MESSAGEDEFINITIONSFORTHREEBYTEHEADERS1/5/94THISPAGELEFTBLANKSAEJ2178.PT4I1/5/94TABLEOFCONTENTS錯誤!頁面上目錄項目的標題層次無效1錯誤!頁面上目錄項目的標題層次無效3錯誤!頁面上目錄項目的標題層次無效3錯誤!頁面上目錄項目的標題層次無效3錯誤!頁面上目錄項目的標題層次無效3錯誤!頁面上目錄項目的標題層次無效3錯誤!頁面上目錄項目的標題層次無效5錯誤!頁面上目錄項目的標題層次無效6錯誤!頁面上目錄項目的標題層次無效7錯誤!頁面上目錄項目的標題層次無效10錯誤!頁面上目錄項目的標題層次無效11錯誤!頁面上目錄項目的標題層次無效14錯誤!頁面上目錄項目的標題層次無效15錯誤!頁面上目錄項目的標題層次無效16錯誤!頁面上目錄項目的標題層次無效17錯誤!頁面上目錄項目的標題層次無效18錯誤!頁面上目錄項目的標題層次無效19錯誤!頁面上目錄項目的標題層次無效20錯誤!頁面上目錄項目的標題層次無效21錯誤!頁面上目錄項目的標題層次無效22錯誤!頁面上目錄項目的標題層次無效23錯誤!頁面上目錄項目的標題層次無效24錯誤!頁面上目錄項目的標題層次無效25錯誤!頁面上目錄項目的標題層次無效26錯誤!頁面上目錄項目的標題層次無效27錯誤!頁面上目錄項目的標題層次無效28錯誤!頁面上目錄項目的標題層次無效29錯誤!頁面上目錄項目的標題層次無效30錯誤!頁面上目錄項目的標題層次無效31錯誤!頁面上目錄項目的標題層次無效32錯誤!頁面上目錄項目的標題層次無效33錯誤!頁面上目錄項目的標題層次無效34錯誤!頁面上目錄項目的標題層次無效35錯誤!頁面上目錄項目的標題層次無效36錯誤!頁面上目錄項目的標題層次無效36錯誤!頁面上目錄項目的標題層次無效38錯誤!頁面上目錄項目的標題層次無效39錯誤!頁面上目錄項目的標題層次無效40錯誤!頁面上目錄項目的標題層次無效41錯誤!頁面上目錄項目的標題層次無效42錯誤!頁面上目錄項目的標題層次無效43錯誤!頁面上目錄項目的標題層次無效44SAEJ2178.PT4II1/5/94錯誤!頁面上目錄項目的標題層次無效45錯誤!頁面上目錄項目的標題層次無效46錯誤!頁面上目錄項目的標題層次無效47錯誤!頁面上目錄項目的標題層次無效48錯誤!頁面上目錄項目的標題層次無效49錯誤!頁面上目錄項目的標題層次無效50錯誤!頁面上目錄項目的標題層次無效51錯誤!頁面上目錄項目的標題層次無效52錯誤!頁面上目錄項目的標題層次無效53錯誤!頁面上目錄項目的標題層次無效54錯誤!頁面上目錄項目的標題層次無效55錯誤!頁面上目錄項目的標題層次無效56錯誤!頁面上目錄項目的標題層次無效57錯誤!頁面上目錄項目的標題層次無效58錯誤!頁面上目錄項目的標題層次無效59錯誤!頁面上目錄項目的標題層次無效59錯誤!頁面上目錄項目的標題層次無效59錯誤!頁面上目錄項目的標題層次無效60錯誤!頁面上目錄項目的標題層次無效60錯誤!頁面上目錄項目的標題層次無效61錯誤!頁面上目錄項目的標題層次無效62錯誤!頁面上目錄項目的標題層次無效63錯誤!頁面上目錄項目的標題層次無效64錯誤!頁面上目錄項目的標題層次無效64SAEJ2178.PT411/5/941SCOPESCOPE:Thisdocumentdefinestheinformationcontainedintheheaderanddatafieldsofnon-diagnosticmessagesforautomotiveserialcommunicationsbasedonSAEJ1850ClassBnetworks.Thisdocumentdescribesandspecifiestheheaderfields,datafields,fieldsizes,scaling,representations,anddatapositionsusedwithinmessages.ThegeneralstructureofaSAEJ1850messageframewithoutin-frameresponseisshowninFigure1below.ThestructureofaSAEJ1850messagewithin-frameresponseisshowninFigure2.Figures1and2alsoshowthescopeofframefieldsdefinedbythisdocumentfornon-diagnosticmessages.RefertoSAEJ1979forspecificationsofemissionsrelateddiagnosticmessageheaderanddatafields.RefertoSAEJ2190forthedefinitionofotherdiagnosticdatafields.Thedescriptionofthenetworkinterfacehardware,basicprotocoldefinition,theelectricalspecifications,andtheCRCbytearegiveninSAEJ1850.-----SAEJ2178-----SOFHeaderFieldDataFieldCRCbyteEOFFigure1-ScopeofSAEJ2178foraSAEJ1850FramewithoutIn-FrameResponse(IFR)-----SAEJ2178-------SAEJ2178--SOFHeaderFieldDataFieldCRCbyteEODIFREOFFigure2-ScopeofSAEJ2178foraSAEJ1850FramewithIn-FrameResponse(IFR)SAEJ1850definestwoandonlytwoformatsofmessageheaders.TheyaretheSingleByteheaderformatandtheConsolidatedheaderformat.Theconsolidatedheaderformathastwoforms,asinglebyteformandathreebyteform.ThisdocumentcoversalloftheseformatsandformstoidentifythecontentsofmessageswhichcouldbesentonaSAEJ1850network.Thisdocumentconsistsoffourparts,eachpublishedseparately.Part1ofSAEJ2178(Titled:DetailedHeaderFormats&PhysicalAddressAssignments)describesthetwoallowedformsofmessageheaderformats,singlebyteandconsolidated.Italsocontainsthephysicalnodeaddressrangeassignmentsforthetypicalsub-systemsofanautomobile.SAEJ2178.PT421/5/94Part2ofSAEJ2178(Titled:DataParameterDefinitions)definesthestandardparametricdatawhichmaybeexchangedonSAEJ1850(ClassB)networks.Theparameterscaling,ranges,andtransferfunctionsarespecified.Messageswhichrefertotheseparametricdefinitionsshallalwaysadheretotheseparametricdefinitions.ItisintendedthatatleastoneofthedefinitionsforeachparameterinthispartmatchtheSAEJ1979definition.Thedetailsofthispartarefullydescribedinparagraph3.1below.Part3ofSAEJ2178(Titled:FrameIDsforSingleByteFormsofHeaders)definesthemessageassignmentsforthesinglebyteheaderformatandtheonebyteformoftheconsolidatedheaderformat.Part4ofSAEJ2178(thispart,Titled:MessageDefinitionforThreebyteHeaders)definesthemessageassignmentsforthethreebyteformoftheconsolidatedheaderformat.SAEJ2178.PT431/5/942REFERENCEANDRELATEDDOCUMENTS,TERMS,DEFINITIONS,ABBREVIATIONS,ANDACRONYMSREFERENCEANDRELATEDDOCUMENTS,TERMS,DEFINITIONS,ABBREVIATIONS,ANDACRONYMS:2.1ReferenceandRelatedDocuments.1ReferenceandRelatedDocuments:2.1.1SAEDocuments.1.1SAEDocuments:SAEJ1213/1JUN91GlossaryofVehicleNetworksforMultiplexandDataCommunicationSAEJ1850AUG91ClassBDataCommunicationNetworkInterfaceSAEJ1930JUN93Electrical/ElectronicSystemsDiagnosticTerms,Definitions,Abbreviations,andAcronymsSAEJ1979DEC91E/EDiagnosticTestModesSAEJ2190JUN93EnhancedE/EDiagnosticTestModes2.1.2OtherDocuments.1.2OtherDocuments:ANSI/IEEEStd754-1985August12,1985IEEEStandardforBinaryFloating-PointArithmetic2.2TermsandDefinitions.2TermsandDefinitions:Data[DataField]-Dataanddatafieldareusedinterchangeablyinthisdocumentandtheybothrefertoafieldwithinaframethatmayincludebyteswithparameterspertainingtothemessageand/orsecondaryIDand/orextendedaddressesand/ortestmodeswhichfurtherdefinesaparticularmessagecontentbeingexchangedoverthenetwork.ExtendedAddress-Theextendedaddressisameanstoallowamessagetobeaddressedtoaspecificgeographicallocationorzoneofthevehicle,indep