J1939 in a Glance

The following points describe the J1939 protocol in brief. These include, on the one hand, typical CAN features but also some new properties that are not all typical for CAN:

• Uses the 29-bit extended CAN identifier
• Standardized CAN baud rates of 250 kbits/s and 500 kbits/s.
• Has point-to-point addressing (node addressing) and global addressing (message addressing)
• Up to 1785 bytes can be transmitted with multi-packet messages
• Bus access control via own network management
• Standardized messages for the overall vehicle communication
• Allows manufacturer-specific message definition
• Defines own diagnostic interface