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Sae J1939 is a set of standards and protocols used for communication and diagnostics among vehicles and other heavy-duty machines. It defines how information is exchanged between electronic control units and systems on a controller area network (CAN). Sae J1939 specifies the messaging format, parameter definitions, and network management for communicating data between components in a vehicle system. It is commonly used in industries such as automotive, agriculture, construction, and marine to enable seamless integration and interoperability among different vehicle components and systems.