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What is J1939 used for?

J1939 is a higher-layer protocol based on Controller Area Network (CAN). It provides serial data communications between microprocessor systems (also called Electronic Control Units - ECU) in any kind of heavy-duty vehicles.

What is PGN in can?

Parameter Group Number (PGN) The J1939 PGN comprises an 18-bit subset of the 29-bit extended CAN ID. In simple terms, the PGN serves as a unique frame identifier within the J1939 standard.

What is code J1939 mean?

J1939 is a set of standards that defines how information is transferred within a CAN to communicate information between ECUs. While a CAN provides a tool for communication, J1939 is a higher-layer protocol that provides a language for communicating using that tool.

What is difference between CAN and J1939?

There is no difference between CAN and J1939. J1939 build on top of CAN 2.0b. When some device sends a big message using the J1939 Transfer protocol (J1939.TP) using BAM other devices can accept this message or ignore it. But there is one important limitation - the device can send only one BAM message at a time.

What is address claim in J1939?

In order to provide a more efficient solution, the SAE J1939 Standard defines an address claim procedure, where each ECU utilizes an 8 bit address to identify the source of a message or to access (destination address) another ECU in the network.

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