I tried swapping RXD and TXD but it doesn’t work either. Is the programming side of things ok with my serial.begin() and println() statements? If so then I need to look at my HW again.
Update: I got it working. The issue was with the MAX232 driver chip, the supply voltage was just a bit too low for it to work properly. I will get myself a lower voltage version to try out. If all this works then I will move to Isolated RS485 so I can move OS to a remote location.
Can’t wait for Ray to enable the SD card and serve the content locally. This will remove the Internet dependency completely.
Ingo