Hi Goutham,
I understand that you are unable to see the 'LIN Pack' and 'LIN Unpack' blocks in the Simulink Library.
The blocks 'LIN Pack' and 'LIN Unpack' require a Simulink Real-Time license. Note that these blocks can only run on Speedgoat real-time hardware and do not enable LIN communication in base Simulink.
To learn more about LIN Pack and LIN Unpack blocks, you can refer the following documentations:
Hope this helps!
