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As the application layer of the Open System Interconnect (OSI) model, SAE J1939-71 defines the majority of the data parameters and messages used across a vehicle's high-speed CAN-based network . While other J1939 documents handle physical wiring or data link management, the document focuses on the data itself: what it means, how it's scaled, and where it sits in a message. Key Components of the Standard
The standard is built around two primary identifiers that allow different vehicle systems to communicate seamlessly:
: These are individual data signals or variables, such as a specific temperature reading or a pressure sensor value.
Understanding SAE J1939-71: The Heart of Heavy-Duty Vehicle Communication