SAE_J2178_2
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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 entirelyvoluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, 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) 776-0243TO PLACE A DOCUMENT ORDER; (724) 776-4970 FAX: (724) 776-0790SAE WEB ADDRESS http://www.sae.orgCopyright 1999 Society of Automotive Engineers, Inc.All rights reserved.
Printed in U.S.A.SAE J2178-2 Revised MAR1999
-2-9.Scaling, Limit, Offset, and Transfer Function (SLOT) Definitions...........................................................249.1Multiple Parameter Packeted (PKT) SLOTs...........................................................................................249.1.1Multiple Parameter Packeted Assignments............................................................................................249.2Bit Mapped Without Mask (BMP) SLOTs................................................................................................269.2.1Bit Mapped Without Mask Parameter Assignments................................................................................309.3Bit Mapped With Mask Bytes (BMM) SLOTs..........................................................................................309.3.1Bit Mapped With Mask Parameter Assignments.....................................................................................309.4Unsigned Numeric (UNM) SLOTs...........................................................................................................309.4.1Unsigned Numeric Variable Assignments...............................................................................................319.52’ Complement Signed Numeric (SNM) SLOT’s.....................................................................................339.5.12’s Complement Signed Numeric Variable Assignments........................................................................349.6State Encoded (SED) SLOT’s................................................................................................................349.6.1State Encoded Variable Assignments....................................................................................................349.7ASCII Encoded (ASC) SLOT’s...............................................................................................................409.7.1ASCII Encoded Variable Assignments...................................................................................................409.7.2ASCII Character Set...............................................................................................................................429.8Binary Coded Decimal (BCD) SLOT’s....................................................................................................429.8.1Binary Coded Decimal (BCD) Variable Assignments.............................................................................429.9Signed Floating Point (Scientific Notation) (SFP) SLOT.........................................................................449.9.1Signed Floating Point Variable Assignment............................................................................................45
10.Multiple Frame, Single Parameter Format..............................................................................................45
11.Manufacturer PRN Usage by SAE J2178 Part.......................................................................................46
12.Notes......................................................................................................................................................5212.1Marginal Indicia.......................................................................................................................................52
Appendix AParameter Name Cross Reference........................................................................................................53
1.Scope—This SAE Recommended Practice defines the information contained in the header and data fields ofnon-diagnostic messages for automotive serial communications based on SAE J1850 Class B networks. Thisdocument describes and specifies the header fields, data fields, field sizes, scaling, representations, and datapositions used within messages.
