J1939 Software
J1939 Protocol Stack
J1939 Protocol Stack

Experience Summary

  • 1000 Global Customers
  • 500 Protocol Stacks
  • 300 CAN Device Drivers
  • 75 Flash Bootloaders
  • 60 Microcontrollers & DSPs
  • 7 Real-Time Operating Systems
  • 1 United States Patent


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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