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DRAFTSAERECOMMENDEDPRACTICEJ2178CLASSBDATACOMMUNICATIONNETWORKMESSAGESPART1DETAILEDHEADERFORMATS&PHYSICALADDRESSASSIGNMENTS1/5/94THISPAGELEFTBLANKSAEJ2178.PT1i1/5/94TABLEOFCONTENTSSCOPE1REFERENCEANDRELATEDDOCUMENTS,TERMS,DEFINITIONS,ABBREVIATIONS,ANDACRONYMS3.1ReferenceandRelatedDocuments3.1.1SAEDocuments3.1.2OtherDocuments3.2TermsandDefinitions3.3AbbreviationsandAcronyms6GENERALINFORMATION7.1Part1Overview7.2In-FrameResponseFieldFormats8.2.1In-FrameResponseType08.2.2In-FrameResponseType18.2.3In-FrameResponseType28.2.4In-FrameResponseType38SINGLEBYTEHEADERMESSAGESANDFORMAT10CONSOLIDATEDHEADERMESSAGESANDFORMAT11.1OneByteFormoftheConsolidatedHeaderFormat11.2ThreeByteFormoftheConsolidatedHeaderFormat11.2.1Priority/Type-Byte112.2.1.1Priority(PPPBits)13.2.1.2HeaderType(HBit)13.2.1.3In-FrameResponse(KBit)14.2.1.4AddressingType(YBit)14.2.1.5TypeModifier(ZZBits)15.2.2TargetAddress-Byte216.2.3SourceAddress-Byte316DATAFIELDFORMATS17.1FunctionalDataFieldFormats17.1.1FunctionalDataFieldFormat017.1.2FunctionalDataFieldFormat117.1.3FunctionalDataFieldFormat217.1.3.1TheParameter/QuantityBit(Qbit)18.1.3.2TheControlBit(Cbit)18.1.3.3TheSecondaryAddress20.1.4FunctionalDataFieldFormat320.1.5FunctionalDataFieldFormat420.2PhysicalDataFieldFormats21.2.1PhysicalDataFieldFormat021.2.2PhysicalDataFieldFormat121.2.3PhysicalDataFieldFormat222.3ExtendedAddressing22PHYSICALADDRESSASSIGNMENTS25APPENDIXA1SAEJ2178.PT111/5/941SCOPESCOPE: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.PT121/5/94Part2ofSAEJ2178(Titled:DataParameterDefinitions)definesthestandardparametricdatawhichmaybeexchangedonSAEJ1850(ClassB)networks.Theparameterscaling,ranges,andtransferfunctionsarespecified.Messageswhichrefertotheseparametricdefinitionsshallalwaysadheretotheseparametricdefinitions.ItisintendedthatatleastoneofthedefinitionsforeachparameterinthispartmatchtheSAEJ1979definition.Thedetailsofthispartarefullydescribedinparagraph3.1below.Part3ofSAEJ2178(Titled:FrameIDsforSingleByteFormsofHeaders)definesthemessageassignmentsforthesinglebyteheaderformatandtheonebyteformoftheconsolidatedheaderformat.Part4ofSAEJ2178(thispart,Titled:MessageDefinitionforThreebyteHeaders)definesthemessageassignmentsforthethreebyteformoftheconsolidatedheaderformat.SAEJ2178.PT131/5/942REFERENCEANDRELATEDDOCUMENTS,TERMS,DEFINITIONS,ABBREVIATIONS,ANDACRONYMSREFERENCEANDRELATEDDOCUMENTS,TERMS,DEFINITIONS,ABBREVIATIONS,ANDACRONYMS:2.1ReferenceandRelatedDocuments.1ReferenceandRelatedDocuments:2.1.1SAEDocuments.1.1SAEDocuments:SAEJ1213/1JUN91GlossaryofVehicleNetworksforMultiplexandDataCommunicationSAEJ1850OCT93ClassBDataCommunicationNetworkInterfaceSAEJ1930JUN93Electrical/ElectronicSystemsDiagnosticTerms,Definitions,Abbreviations,andAcronymsSAEJ1979DEC91E/EDiagnosticTestModesSAEJ2190JUN93EnhancedE/EDiagnosticTestModes2.1.2OtherDocuments.1.2OtherDocuments:ANSI/IEEEStd754-1985August12,1985IEEEStandardforBinaryFloating-PointArithmetic2.2TermsandDefinitions.2TermsandDefinitions:AcknowledgementMessageType-usedbytheinitiatingmoduletoverifythereceptionofamessage.BroadcastMessageType-usedtotransferinformationfromtheinitiatingmoduletooneormoremoduleswhichrecognizethefunctionaltargetaddress.Eachofthereceivingmodulesshallattempttogenerateanin-frameresponseacknowledgement.However,bitbybitarbitrationwillinsurethatonlythereceivingmodulewhichpossessesthehighestpriority(lowestnumeric)physicaladdressshalltransmitthein-frameresponseac
本文标题:SAE建议使用的实践J2178类B数据通信的网络消息零件(1)
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