What are the characteristics of J1939?

The characteristics of the J1939 protocol are:

1. Higher-layer protocol based on Controller Area Network (CAN)
2. Provides serial data communication between Electronic Control Units (ECUs) in any kind of heavy duty vehicle.
3. Extended CAN identifier (29 bit)
4. The bit rate of 250 kbit/s
5. Peer-to-peer and broadcast communication
6. Transport protocols for up to 1785 data bytes
7. Network management
8. Definition of parameter groups for commercial vehicles and others
9. Manufacturer-specific parameter groups are supported
10. Diagnostics features
11. Maximum 30 nodes (ECUs) in a network