- Overview
- 1. Introduction
- 2. General Description of the Protocol
- 3. Document Structure
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4. Fundamentals
- 4.1. Names and Addresses
- Device Names
- Device Address
- 4.2. Parameter Group
- General
- Structure and Type of a Parameter Group
- Example of a Global Parameter Group
- Example of a Specific Parameter Group
- Parameter Groups reserved specially for the Protocol
- 4.3. Data Management
- Suspect Parameter Number (SPN)
- SLOT Definition
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5. Network Management
- Network Access
- 5.1. Address Conflict
- Solution and Configurations
- Handling in a Dynamic Network
- 6. Transport Protocols (Multi-packet Messages)
- 7. Diagnostics
Characteristics
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
Last modified: Friday, 27 April 2018, 8:21 AM