![]() CAN was not originally free, but its instruction set did fit in the custom instruction format of J1939. 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. A different physical layer is used between the tractor and trailer, specified in ISO 11992. SAE J1939 is used in the commercial vehicle area for communication throughout the vehicle, with the physical layer defined in ISO 11898. Originating in the car and heavy-duty truck industry in the United States, it is now widely used in other parts of the world. Society of Automotive Engineers standard SAE J1939 is the vehicle bus recommended practice used for communication and diagnostics among vehicle components. Truck Bus Control And Communications Network Committee
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