J1939 Software
J1939 Protocol Stack
J1939 Protocol Stack

Experience Summary

  • 95 Real-Time Embedded Systems
  • 45 Microcontrollers & DSPs
  • 25 Protocol Stacks
  • 20 CAN Device Drivers
  • 15 Flash Bootloaders
  • 7 Real-Time Operating Systems
  • 2 United States Patents Pending


J1939/14 specifies one of three possible physical layers for a J1939 network and is still in draft form. This specification is responsible for defining things such as backbone length, stub length, network termination, twists per inch, shielding, shielding termination, baud rate, and signal slew rate.
Besides the above mentioned parameters there are several other details such as connector dimensions and testing requirements specified by this standard. For complete information, we recommend buying the specification from the SAE when it becomes available.

J1939/14 Details:

  • Backbone length max: not available
  • Stub length max: not available
  • Node count max: not available
  • CAN bus data rate: 500 Kbps
  • CAN bus tolerance: +/- 0.05%
  • Cable: Twisted unshielded pair
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