SAE J2178-2-1999 Class B Data Communication Network Messages.Part 2∶ Data Parameter Definitions.pdf
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1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefr
2、om, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. QUESTIONS REGARDING THIS DOCUMENT: (724) 772-8512 FAX: (724) 776-0243 TO PLACE A DOCU
3、MENT ORDER; (724) 776-4970 FAX: (724) 776-0790 SAE WEB ADDRESS http:/www.sae.org Copyright 1999 Society of Automotive Engineers, Inc. All rights reserved.Printed in U.S.A. SURFACE VEHICLE 400 Commonwealth Drive, Warrendale, PA 15096-0001 RECOMMENDED PRACTICE J2178-2 REV. MAR1999 Issued1993-06 Revise
4、d1999-03 Superseding J2178-2 MAY1997 Class B Data Communication Network Messages Part 2: Data Parameter Definitions TABLE OF CONTENTS 1.Scope . 2 1.1Standardized Parameter Definitions. 3 2.References. 4 2.1Applicable Publications 4 2.1.1SAE Publications 4 2.1.2Other Publications 4 3.Definitions. 4 4
5、.Abbreviations and Acronyms 5 5.General Information 6 5.1Part 2 Overview 6 5.2How to Use This Document 6 6.Parameter Reference Number (PRN) Structure. 7 7.Parameter Formats. 9 7.1Bit Mapped Parameters 9 7.1.1Bit Mapped Data Without Mask Byte(s) 9 7.1.2Bit Mapped Data With Mask Byte(s). 10 7.1.3Bit V
6、alues . 11 7.2Byte (8 Bit) Parameters 11 7.3Word (16 Bit) Parameters. 11 7.4Multi-Byte (16 Bit) Parameters . 12 7.5Multiple Parameter Packets 12 8.Specific Parameter (PRN) Assignments. 12 8.1Specific Parameters . 12 SAE J2178-2 Revised MAR1999 -2- 9.Scaling, Limit, Offset, and Transfer Function (SLO
7、T) Definitions.24 9.1Multiple Parameter Packeted (PKT) SLOTs.24 9.1.1Multiple Parameter Packeted Assignments24 9.2Bit Mapped Without Mask (BMP) SLOTs26 9.2.1Bit Mapped Without Mask Parameter Assignments30 9.3Bit Mapped With Mask Bytes (BMM) SLOTs30 9.3.1Bit Mapped With Mask Parameter Assignments.30
8、9.4Unsigned Numeric (UNM) SLOTs.30 9.4.1Unsigned Numeric Variable Assignments.31 9.52 Complement Signed Numeric (SNM) SLOT s.33 9.5.12 s Complement Signed Numeric Variable Assignments34 9.6State Encoded (SED) SLOT s 34 9.6.1State Encoded Variable Assignments 34 9.7ASCII Encoded (ASC) SLOT s .40 9.7.
9、1ASCII Encoded Variable Assignments .40 9.7.2ASCII Character Set .42 9.8Binary Coded Decimal (BCD) SLOT s42 9.8.1Binary Coded Decimal (BCD) Variable Assignments .42 9.9Signed Floating Point (Scientific Notation) (SFP) SLOT.44 9.9.1Signed Floating Point Variable Assignment45 10.Multiple Frame, Single
10、 Parameter Format45 11.Manufacturer PRN Usage by SAE J2178 Part .46 12.Notes 52 12.1Marginal Indicia.52 Appendix A Parameter Name Cross Reference 53 1.Scope This SAE Recommended Practice defines the information contained in the header and data fields of non-diagnostic messages for automotive serial
11、communications based on SAE J1850 Class B networks. This document describes and specifies the header fields, data fields, field sizes, 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.
12、 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 frame 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
13、SAE J2190 for the definition of other diagnostic data fields. The description of the network interface hardware, basic protocol definition, electrical specifications, and the CRC byte are given in SAE J1850. FIGURE 1 SCOPE OF SAE J2178 FOR A SAE J1850 FRAME WITHOUT IN-FRAME RESPONSE (IFR) SAE J2178-
14、2 Revised MAR1999 -3- FIGURE 2 SCOPE OF SAE J2178 FOR A SAE J1850 FRAME WITH 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 f
15、orm and a three byte form. This document covers all of these formats and forms to identify the contents of messages which could be sent on a SAE J1850 network. This document consists of four parts, each published separately. SAE J2178-1, Part 1 of SAE J2178 (Titled: Detailed Header Formats and Physi
16、cal Address Assignments) describes the two allowed forms of message header formats, Single Byte and Consolidated. It also contains the physical node address range assignments for the typical sub-systems of an automobile. SAE J2178-2, Part 2 of SAE J2178 (this part, Titled: Data Parameter Definitions
17、) defines the standard parametric data which may be exchanged on SAE J1850 (Class B) networks. The parameter scaling, 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 o
18、ne of the definitions for each parameter in this part match the SAE J1979 definition. SAE J2178-3, 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. SAE J
19、2178-4, Part 4 of SAE J2178 (Titled: Message Definition for Three Byte Headers) defines the message assignments for the three byte form of the Consolidated header format. 1.1Standardized Parameter Definitions The parameters used to describe data variables are one of the most important functions of t
20、his document. To achieve commonality of messages in Class B networks, the data parameters must become standardized. This applies to data parameter definitions for use during normal vehicle operations as well as during diagnostic operations. By using common parameter definitions for non- diagnostic a
21、nd diagnostic functions on the network, the modules which form the network can maintain one image or description of a data parameter. At this time however, it is felt that there is not enough experience and commonality of philosophy within the industry to define standard parameters. The purpose of t
22、his document is therefore to provide standard methods of defining parameters and examples of defined parameters for many potential applications within a vehicle. With this basis, it should be possible to avoid the definition of arbitrarily different parameters and move toward standard parameters in
23、the future. Where parameters have been defined in the Diagnostic Test Modes, documents (SAE J1979 and J2190), such as Parameter Identifies for diagnostic purposes, the definitions in Part 2 of this document match the diagnostic definition. SAE J2178-2 Revised MAR1999 -4- SAE J2178-2 defines the para
24、meters to be used for non-diagnostic and diagnostic data format definitions. For new parameter definitions which are needed in the future, the new definitions, if they are expected to become widely used, must be integrated into this document for commonality across these types of applications. Of cou
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