The SAE J1939 documents are intended for light, medium, and heavy-duty vehicles used on or off road as well as appropriate stationary applications which use vehicle derived components (e.g., generator sets). Vehicles of interest include, but are not limited to, on- and off-highway trucks and their trailers, construction equipment, and agricultural equipment and implements.
The purpose of these documents is to provide an open interconnect system for electronic systems. It is the intention of these documents to allow Electronic Control Units to communicate with each other by providing a standard architecture.
This particular document, SAE J1939-21, describes the data link layer using the CAN protocol with 29-bit Identifiers. For SAE J1939 no alternative data link layers are permitted.
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This SAE Recommended Practice revision incorporates changes to the abort reasons for transport protocol sessions.
Additional Acknowledgement reasons were added.
Additions to the Request2 PGN to add more capabilities with corresponding Acknowledgement capabilities.
Clarifications regarding request and response expectations while using request PGNs specifically or when performing requests via other PGNs.
The number of Proprietary B PGNs were doubled.
Table 2 clarifications added.