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


J1939/21 specifies the datalink layer for a J1939 network and is the only datalink layer published and supported for J1939. This specification is responsible for defining the bit encoding of 29-bit CAN identifiers.
Also included in this specification is the encoding for source address (SA), destination address (DA), priority (P), and parameter group number (PGN).
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