J1939

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SAE J1939 is the Vehicle Network Communication standard used for communication and diagnostics, originally by the heavy duty truck industry in the United States.

SAE J1939 defines five layers in the 7-layer OSI network model, and this includes the CAN 2.0b specification (29-bit header) for the physical and data-link layers. The session and presentation layers are not part of the specification.

This standar uses an hexadecimal index called PGN (Page Group Number) in order to diferenciate the several information packages, so there is one PGN for each vehicle variable.

SAE J1939 can be considered the replacement for the older SAE J1708 and SAE J1587 specifications.

SAE J1939 has been adopted widely by diesel engine manufacturers. One driving force behind this is the increasing adoption of the engine ("black box") Electronic Control Unit (ECU), which provides one method of controlling exhaust emissions within US and European standards. Consequently, SAE J1939 can now be found in a range of diesel-powered applications: vehicles (on- and off-road), marine propulsion, power generation and industrial pumping.

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