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J1939 protocol, large-scale application of CAN bus in the automotive industry

J1939 protocol, large-scale application of CAN bus in the automotive industry


CAN bus is currently a more popular communication bus, which was first used in the communication of aircraft, tanks and other systems.


Due to its excellent performance, it is gradually used in the automotive industry to ensure the completion of specific actions inside the car.


There are generally two CAN buses in the car, namely CAN low line and CAN high line. The two lines connect the car instrument, ECU, control module, gearbox, auxiliary braking system, various sensors and switches, so as to realize information exchange. Sync in real time.


What is the J1939 protocol  ?  What does it do  ?


According to the data, the J1939 protocol is a recommended standard protocol of the American Society of Automotive Engineers, which is mainly used to provide a standard architecture for communication between electronic components on medium and heavy road vehicles.


It is mainly based on the CAN bus developed by the German Bosch company, and the fastest communication rate can reach 250Kbps.


This agreement describes a network application of heavy vehicle field bus, including CAN network physical layer definition, data link layer definition, application layer definition, network layer definition, fault diagnosis and network management.


In addition, the protocol not only specifies the transmission type, message structure and its segmentation, flow inspection, etc., but also precisely defines the message content itself.


Therefore, the J1939 protocol is an important promoter of the CAN bus in the vehicle field; and up to now, equipment such as commercial vehicles, ships, rail locomotives, agricultural machinery, and large engines have generally used the J1939 protocol.


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