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Status | Published |
---|---|
Latest version | 2013-08-14 |
Organization | SAE International |
Committee | Truck Bus Control And Communications Network Committee |
Related standards | ISO 11898, ISO 11992, ISO 11783, NMEA 2000 |
Abbreviation | SAE J1939 |
J1908. Redlines comparisons are available for those standards listed in the Revision History that contain a radio button. A redline comparison of the current version against a revision is accomplished by selecting the radio button next to the standard and then selecting 'compare'.
Society of Automotive Engineers standard SAE J1939 is the vehicle bus recommended practice used for communication and diagnostics among vehicle components. Originating in the car and heavy-duty truck industry in the United States, it is now widely used in other parts of the world.
SAE J1939 is used in the commercial vehicle area for communication throughout the vehicle, with the physical layer defined in ISO 11898. A different physical layer is used between the tractor and trailer, specified in ISO 11992.
History[edit]
Originally, Controller Area Network (CAN) was not mentioned in J1939, which covered cars and tractor-trailer rigs, and with some dual and triple use 8-bit addresses assigned by the SAE J1939 board. CAN was not originally free, but its instruction set did fit in the custom instruction format of J1939. This was true as of 2000. Since then, CAN has been included, the chipset for J1939 has been clocked faster[clarification needed], and 16-bit addresses (PGN) have replaced 8-bit addresses.
J1939, ISO 11783 and NMEA 2000 all share the same high level protocol. SAE J1939 can be considered the replacement for the older SAE J1708 and SAE J1587 specifications.[citation needed]
![J1939 71 2013 J1939 71 2013](https://slideplayer.com/slide/1676596/7/images/38/J1939+Data+Message+Interpretation.jpg)
Definition[edit]
SAE J1939 defines five layers in the seven-layer OSI network model, and this includes the Controller Area Network (CAN) ISO 11898 specification (using only the 29-bit/'extended' identifier) for the physical and