Since you need the "hot" (current) version, here is the only legal path:
The standard provides a comprehensive set of conventions and definitions, covering: sae j193971 pdf hot
+-------------------------------------------------------------+ | OSI Application Layer: J1939-71 | | (Defines real-world parameters: Speed, Temps, Pressures) | +-------------------------------------------------------------+ │ ▼ +-------------------------------------------------------------+ | Data Link & Transport: J1939-21 | | (Assembles data into 29-bit identifier CAN frames) | +-------------------------------------------------------------+ │ ▼ +-------------------------------------------------------------+ | Physical Layer: J1939-11 | | (Shielded Twisted Pair, 250k bits/s wires) | +-------------------------------------------------------------+ The Anatomy of Data: PGNs and SPNs Since you need the "hot" (current) version, here
In the world of commercial vehicles, including trucks, buses, and agricultural machinery, SAE J1939-71 acts as the of the communication stack. It translates raw binary data flowing through a Controller Area Network (CAN bus) into readable human and machine information. and agricultural machinery
Before purchasing, engineers in large organizations should check for existing licenses:
It lists thousands of PGNs (Parameter Group Numbers, which identify a message) and SPNs (Suspect Parameter Numbers, which define specific data points within a message).