Your engineering team is building a fuel cell controller for a mining truck. You need to assign a for in-house data, but J1939-71 tells you exactly which PGNs are reserved to avoid collisions with standard J1939 traffic.
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SAE J1939-71 defines the Vehicle Application Layer, specifying the data definitions for heavy-duty vehicle ECUs, including PGNs for parameter groups and SPNs for individual signals. It functions at the OSI application layer to ensure interoperability, with modern definitions largely migrated to the J1939DA digital annex. For more details, visit SAE International . I can, however, help by: SAE J1939-71 defines