Hi Robert,
The one of the biggest change between LIN1.3 and LIN2.0 was adding an enhanced checksum and diagnostic.
The classic checksum is checksum model used in the LIN specification versions up to version 1.3 for all frames. In LIN 2.x it is used only for the diagnostic frames. The classic checksum considers the data bytes only.
The enhanced checksum is checksum model used in the LIN specification versions starting from LIN 2.0 for all frames, except the diagnostic frames. The enhanced checksum includes the PID and the data bytes.
Frame identifiers 60 (0x3C) to 61 (0x3D) shall always use classic checksum.
If your LIN2.x master node is able to communicate with LIN slave with frame identifiers different from 0x3C or 0x3D, the LIN slave is LIN2.x compatible. The problem with the checksum at such frame identifiers may point to incompatible LIN versions.
I hope it helps you.
Have a great day,
Radek
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