SAE建议使用的实践J2178类B数据通信的网络消息零件DOC34文档格式.docx
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SAE建议使用的实践J2178类B数据通信的网络消息零件DOC34文档格式.docx
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TABLEOFCONTENTS
SCOPE1
REFERENCEANDRELATEDDOCUMENTS,TERMS,DEFINITIONS,ABBREVIATIONS,ANDACRONYMS3
.1ReferenceandRelatedDocuments3
.1.1SAEDocuments3
.1.2OtherDocuments3
.2TermsandDefinitions3
.3AbbreviationsandAcronyms6
GENERALINFORMATION7
.1Part1Overview7
.2In-FrameResponseFieldFormats8
.2.1In-FrameResponseType08
.2.2In-FrameResponseType18
.2.3In-FrameResponseType28
.2.4In-FrameResponseType38
SINGLEBYTEHEADERMESSAGESANDFORMAT10
CONSOLIDATEDHEADERMESSAGESANDFORMAT11
.1OneByteFormoftheConsolidatedHeaderFormat11
.2ThreeByteFormoftheConsolidatedHeaderFormat11
.2.1Priority/TypeByte112
.2.1.1Priority(PPPBits)13
.2.1.2HeaderType(HBit)13
.2.1.3InFrameResponse(KBit)14
.2.1.4AddressingType(YBit)14
.2.1.5TypeModifier(ZZBits)15
.2.2TargetAddressByte216
.2.3SourceAddressByte316
DATAFIELDFORMATS17
.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
.3ExtendedAddressing22
PHYSICALADDRESSASSIGNMENTS25
APPENDIXA1
1SCOPESCOPE:
Thisdocumentdefinestheinformationcontainedintheheaderanddatafieldsofnon-diagnosticmessagesforautomotiveserialcommunicationsbasedonSAEJ1850ClassBnetworks.Thisdocumentdescribesandspecifiestheheaderfields,datafields,fieldsizes,scaling,representations,anddatapositionsusedwithinmessages.
ThegeneralstructureofaSAEJ1850messageframewithoutin-frameresponseisshowninFigure1below.ThestructureofaSAEJ1850messagewithin-frameresponseisshowninFigure2.Figures1and2alsoshowthescopeofframefieldsdefinedbythisdocumentfornon-diagnosticmessages.RefertoSAEJ1979forspecificationsofemissionsrelateddiagnosticmessageheaderanddatafields.RefertoSAEJ2190forthedefinitionofotherdiagnosticdatafields.Thedescriptionofthenetworkinterfacehardware,basicprotocoldefinition,theelectricalspecifications,andtheCRCbytearegiveninSAEJ1850.
<
-----SAEJ2178----->
SOF
HeaderField
DataField
CRCbyte
EOF
Figure1-ScopeofSAEJ2178foraSAEJ1850
FramewithoutIn-FrameResponse(IFR)
--SAEJ2178-->
EOD
IFR
Figure2-ScopeofSAEJ2178foraSAEJ1850
FramewithIn-FrameResponse(IFR)
SAEJ1850definestwoandonlytwoformatsofmessageheaders.TheyaretheSingleByteheaderformatandtheConsolidatedheaderformat.Theconsolidatedheaderformathastwoforms,asinglebyteformandathreebyteform.ThisdocumentcoversalloftheseformatsandformstoidentifythecontentsofmessageswhichcouldbesentonaSAEJ1850network.
Thisdocumentconsistsoffourparts,eachpublishedseparately.
Part1ofSAEJ2178(Titled:
DetailedHeaderFormats&
PhysicalAddressAssignments)describesthetwoallowedformsofmessageheaderformats,singlebyteandconsolidated.Italsocontainsthephysicalnodeaddressrangeassignmentsforthetypicalsub-systemsofanautomobile.
Part2ofSAEJ2178(Titled:
DataParameterDefinitions)definesthestandardparametricdatawhichmaybeexchangedonSAEJ1850(ClassB)networks.Theparameterscaling,ranges,andtransferfunctionsarespecified.Messageswhichrefertotheseparametricdefinitionsshallalwaysadheretotheseparametricdefinitions.ItisintendedthatatleastoneofthedefinitionsforeachparameterinthispartmatchtheSAEJ1979definition.Thedetailsofthispartarefullydescribedinparagraph3.1below.
Part3ofSAEJ2178(Titled:
FrameIDsforSingleByteFormsofHeaders)definesthemessageassignmentsforthesinglebyteheaderformatandtheonebyteformoftheconsolidatedheaderformat.
Part4ofSAEJ2178(thispart,Titled:
MessageDefinitionforThreebyteHeaders)definesthemessageassignmentsforthethreebyteformoftheconsolidatedheaderformat.
2REFERENCEANDRELATEDDOCUMENTS,TERMS,DEFINITIONS,ABBREVIATIONS,ANDACRONYMSREFERENCEANDRELATEDDOCUMENTS,TERMS,DEFINITIONS,ABBREVIATIONS,ANDACRONYMS:
2.1ReferenceandRelatedDocuments.1ReferenceandRelatedDocuments:
2.1.1SAEDocuments.1.1SAEDocuments:
SAEJ1213/1JUN91GlossaryofVehicleNetworksforMultiplexandDataCommunication
SAEJ1850OCT93ClassBDataCommunicationNetworkInterface
SAEJ1930JUN93Electrical/ElectronicSystemsDiagnosticTerms,Definitions,Abbreviations,andAcronyms
SAEJ1979DEC91E/EDiagnosticTestModes
SAEJ2190JUN93EnhancedE/EDiagnosticTestModes
2.1.2OtherDocuments.1.2OtherDocuments:
ANSI/IEEEStd754-1985
August12,1985IEEEStandardforBinaryFloating-PointArithmetic
2.2TermsandDefinitions.2TermsandDefinitions:
AcknowledgementMessageType-usedbytheinitiatingmoduletoverifythereceptionofamessage.
BroadcastMessageType-usedtotransferinformationfromtheinitiatingmoduletooneormoremoduleswhichrecognizethefunctionaltargetaddress.Eachofthereceivingmodulesshallattempttogenerateanin-frameresponseacknowledgement.However,bitbybitarbitrationwillinsurethatonlythereceivingmodulewhichpossessesthehighestpriority(lowestnumeric)physicaladdressshalltransmitthein-frameresponseacknowledgement.
Data[DataField]-Dataanddatafieldareusedinterchangeablyinthisdocumentandtheybothrefertoafieldwithinaframethatmayincludebyteswithparameterspertainingtothemessageand/orsecondaryIDand/orextendedaddressesand/ortestmodeswhichfurtherdefinesaparticularmessagecontentbeingexchangedoverthenetwork.
ExtendedAddress-Theextendedaddressfieldprovidesameanstofurtherdefineamessageasbeingrelatedtoaspecificgeographicallocationorzoneofthevehicle,independentofanynode'
sphysicaladdress.
Frame-AframeisonecompletetransmissionofinformationwhichmayormaynotincludeanIn-FrameResponse.Theframeisenclosedbythestartofframeandendofframesymbols.ForClassBnetworks,eachframecontainsoneandonlyonemessage(see"
message"
definitionbelow).
FrameID-TheFrameIDistheheaderbytefortheSingleByteHeaderformatandtheonebyteformoftheconsolidatedheaderformat.ThedefinitionoftheframeIDisfoundinSAEJ2178,Part3.Thisheaderbytedefinesthetargetandsourceandcontentoftheframe.
FunctionCommand/StatusMessageType-usedbytheinitiatingmoduletocommandachangein,orreportthestatusofaparametertooneormoremodules.
FunctionExt.Command/StatusMessageType-usedbytheinitiatingmoduletocommandachangein,orreportthestatusofaparameter(usingextendedaddressing)tooneormoremodules.
FunctionExt.Request/QueryMessageType-usedbytheinitiatingmoduletorequestthestatusofaparameter(usingextendedaddressing)ortodeterminewhichnodesmonitortheparameter.
FunctionalAddressing-Functionaladdressingallowsamessagetobeaddressedorsenttooneormorenodesonthenetworkinterestedinthatfunction.Functionaladdressingisintendedformessagesthatmaybeofinteresttomorethanasinglenode.Forexample,anexteriorlamp"
off"
messagecouldbesenttoallnodescontrollingthevehicleexteriorlampsbyusingafunctionaladdress.ThefunctionaladdressconsistsofaprimaryIDandmayincludeasecondaryIDandmayalsoincludeanextendedaddress.
FunctionMessageType-usedtotransferinformationfromtheinitiatingmoduletooneormoremoduleswhichrecognizethefunctionaltargetaddress.Eachreceivingmoduleshalltransmitanin-frameresponseacknowledgement.Whenrespondentsarelimitedtoseven,itisthesevenwiththelowestphysicaladdresswhichsuccessfullyrespondthroughthearbitratrionprocess.
FunctionQueryMessageType-transfersnoinformation(no-op)fromtheinitiatingmoduletotheoneormoremoduleswhichrecognizethefunctionaltargetaddress.Eachofthereceivingmodulesshallattempttogenerateanin-frameresponseacknowledgement(uptosevenmayappear).
FunctionReadMessageType-usedtotransferinformationfromasinglereceivingmoduletothemodulewhichinitiatesthetransferrequest.Therequestandtransferofinformationshalloccurwithinasinglemessage,withthedatareturnedinthein-frameresponse.
FunctionRequest/QueryMessageType-usedbytheinitiatingmoduletorequestthestatusofaparameterortodeterminewhichnodesmonitortheparameter.
Header[HeaderField]-Theheader(orheaderfield,usedinterchangeably)isaoneorthreebytefieldwithinaframewhichcontainsinformationaboutthemessagepriority,messagesourceandtargetaddressing,messagetype,andin-frameresponsetype.
In-FrameResponse(IFR)Type-TheIFRtypeidentifiestheformofthein-frameresponsewhichisexpectedwithinthatmessage.
Load-Theloadcommandindicatestheoperationofdirectlyreplacingthecurrent/existingvalueofaparameterwiththeparametervalue(s)containedinthemessage.
Message-Amessageconsistsofalloftheby
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