SAE建议使用的实践J2178类B数据通信的网络消息零件(DOC34).doc
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1、DRAFTSAE RECOMMENDED PRACTICE J2178CLASS B DATA COMMUNICATION NETWORK MESSAGESPART 1DETAILED HEADER FORMATS & PHYSICAL ADDRESS ASSIGNMENTS1/5/94THIS PAGE LEFT BLANKTABLE OF CONTENTSSCOPE1REFERENCE AND RELATED DOCUMENTS, TERMS, DEFINITIONS, ABBREVIATIONS, AND ACRONYMS3.1Reference and Related Document
2、s3.1.1SAE Documents3.1.2Other Documents3.2Terms and Definitions3.3Abbreviations and Acronyms6GENERAL INFORMATION7.1Part 1 Overview7.2In-Frame Response Field Formats8.2.1In-Frame Response Type 08.2.2In-Frame Response Type 18.2.3In-Frame Response Type 28.2.4In-Frame Response Type 38SINGLE BYTE HEADER
3、MESSAGES AND FORMAT10CONSOLIDATED HEADER MESSAGES AND FORMAT11.1One Byte Form of the Consolidated Header Format11.2Three Byte Form of the Consolidated Header Format11.2.1Priority / Type Byte 112.2.1.1Priority (PPP Bits)13.2.1.2Header Type (H Bit)13.2.1.3InFrame Response (K Bit)14.2.1.4Addressing Typ
4、e (Y Bit)14.2.1.5Type Modifier (ZZ Bits)15.2.2Target Address Byte 216.2.3Source Address Byte 316DATA FIELD FORMATS17.1Functional Data Field Formats17.1.1Functional Data Field Format 017.1.2Functional Data Field Format 117.1.3Functional Data Field Format 217.1.3.1The Parameter / Quantity Bit (Q bit)1
5、8.1.3.2The Control Bit (C bit)18.1.3.3The Secondary Address20.1.4Functional Data Field Format 320.1.5Functional Data Field Format 420.2Physical Data Field Formats21.2.1Physical Data Field Format 021.2.2Physical Data Field Format 121.2.3Physical Data Field Format 222.3Extended Addressing22PHYSICAL AD
6、DRESS ASSIGNMENTS25APPENDIX A11SCOPESCOPE:This document defines the information contained in the header and data fields of non-diagnostic messages for automotive serial communications based on SAE J1850 Class B networks. This document describes and specifies the header fields, data fields, field siz
7、es, scaling, representations, and data positions used within messages. The general structure of a SAE J1850 message frame without in-frame response is shown in Figure 1 below. The structure of a SAE J1850 message with in-frame response is shown in Figure 2. Figures 1 and 2 also show the scope of fra
8、me fields defined by this document for non-diagnostic messages. Refer to SAE J1979 for specifications of emissions related diagnostic message header and data fields. Refer to SAE J2190 for the definition of other diagnostic data fields. The description of the network interface hardware, basic protoc
9、ol definition, the electrical specifications, and the CRC byte are given in SAE J1850.SOFHeader FieldData FieldCRC byteEOFFigure 1 - Scope of SAE J2178 for a SAE J1850Frame without In-Frame Response (IFR)SOFHeader FieldData FieldCRC byteEODIFREOFFigure 2 - Scope of SAE J2178 for a SAE J1850Frame wit
10、h In-Frame Response (IFR)SAE J1850 defines two and only two formats of message headers. They are the Single Byte header format and the Consolidated header format. The consolidated header format has two forms, a single byte form and a three byte form. This document covers all of these formats and for
11、ms to identify the contents of messages which could be sent on a SAE J1850 network.This document consists of four parts, each published separately. Part 1 of SAE J2178 (Titled: Detailed Header Formats & Physical Address Assignments) describes the two allowed forms of message header formats, single b
12、yte and consolidated. It also contains the physical node address range assignments for the typical sub-systems of an automobile.Part 2 of SAE J2178 (Titled: Data Parameter Definitions) defines the standard parametric data which may be exchanged on SAE J1850 (Class B) networks. The parameter scaling,
13、 ranges, and transfer functions are specified. Messages which refer to these parametric definitions shall always adhere to these parametric definitions. It is intended that at least one of the definitions for each parameter in this part match the SAE J1979 definition. The details of this part are fu
14、lly described in paragraph 3.1 below.Part 3 of SAE J2178 (Titled: Frame IDs for Single Byte Forms of Headers) defines the message assignments for the single byte header format and the one byte form of the consolidated header format.Part 4 of SAE J2178 (this part, Titled: Message Definition for Three
15、 byte Headers) defines the message assignments for the three byte form of the consolidated header format.2REFERENCE AND RELATED DOCUMENTS, TERMS, DEFINITIONS, ABBREVIATIONS, AND ACRONYMSREFERENCE AND RELATED DOCUMENTS, TERMS, DEFINITIONS, ABBREVIATIONS, AND ACRONYMS:2.1Reference and Related Document
16、s.1Reference and Related Documents:2.1.1SAE Documents.1.1SAE Documents:SAE J1213/1JUN91Glossary of Vehicle Networks for Multiplex and Data CommunicationSAE J1850OCT93Class B Data Communication Network InterfaceSAE J1930JUN93Electrical/Electronic Systems Diagnostic Terms, Definitions, Abbreviations,
17、and AcronymsSAE J1979DEC91E/E Diagnostic Test ModesSAE J2190JUN93Enhanced E/E Diagnostic Test Modes2.1.2Other Documents.1.2Other Documents:ANSI/IEEE Std 754-1985August 12, 1985IEEE Standard for Binary Floating-Point Arithmetic2.2Terms and Definitions.2Terms and Definitions:Acknowledgement Message Ty
18、pe - used by the initiating module to verify the reception of a message.Broadcast Message Type - used to transfer information from the initiating module to one or more modules which recognize the functional target address. Each of the receiving modules shall attempt to generate an in-frame response
19、acknowledgement. However, bit by bit arbitration will insure that only the receiving module which possesses the highest priority (lowest numeric) physical address shall transmit the in-frame response acknowledgement.Data Data Field - Data and data field are used interchangeably in this document and
20、they both refer to a field within a frame that may include bytes with parameters pertaining to the message and / or secondary ID and / or extended addresses and / or test modes which further defines a particular message content being exchanged over the network.Extended Address - The extended address
21、 field provides a means to further define a message as being related to a specific geographical location or zone of the vehicle, independent of any nodes physical address.Frame - A frame is one complete transmission of information which may or may not include an In-Frame Response. The frame is enclo
22、sed by the start of frame and end of frame symbols. For Class B networks, each frame contains one and only one message (see message definition below).Frame ID - The Frame ID is the header byte for the Single Byte Header format and the one byte form of the consolidated header format. The definition o
23、f the frame ID is found in SAE J2178, Part 3. This header byte defines the target and source and content of the frame.Function Command / Status Message Type - used by the initiating module to command a change in, or report the status of a parameter to one or more modules.Function Ext. Command / Stat
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