technoplusnl wrote: The Nano USB port will do a reset when you open the serial line (to get it in clear state); To start communication it need a ~2 second delay. The Moonlite software under Windows does not wait for that and communication fails ... You can avoid this by soldering a capacitor somewhere between 2 pins but then you need a switch to disable it or you can't download new firmware. It is well described in the MyFocuser project. (Not the MyFocuser2, that is not Moonlite compatible)
(Excellent focuser software and design)