Browse Standards J2178/4_199903
Historical Revised 1999-03-11

Class B Data Communication Network Messages - Message Definitions for Three Byte Headers J2178/4_199903

This SAE Recommended Practice 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 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. 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 SAE J2190 for the definition of other diagnostic data fields. The description of the network interface hardware, basic protocol definition, the electrical specifications, and the CRC byte are given in SAE J1850. 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 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.
J2178/4_201104
2011-04-01
Latest
Stabilized
J2178/4_200407
2004-07-27
Historical
Reaffirmed
J2178/4_199903
1999-03-11
Historical
Revised
J2178/4_199502
1995-02-01
Historical
Issued

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