- Drop DNP note from LM78xx regulator and its capacitors. The regulator is used to step-down the 24V input to 5V for the Raspberry Pi Pico. Not using the regulator means a separate 5V supply is needed which is pretty pointless.
- Removed the screw-terminal J9 for an external 5V supply.
- Switched Screw-Terminal for 24V supply to a 2-pin variant.
- Fixup wrong resistor values in DI stage. The 680Ω resistors were meant to be 820Ω from the beginning but this was not copied correctly. With the wrong value, the DI limiting values are slightly off from what is specified in the schematic.
- Switch to a 14-pin IDC connector.
Initial.