Thanks to the help of one of you i discovered a big bug in my schematic and PCB. This could lead to a non working condition and your PC will give an error message like:
“Unknown device”. To correct this bug please go to the FMSUSB page. I have build three circuits, two of those was working also if this bug was present, but one worked only after the bugfix so i think this will strongly depend on hardware configuration and components value change due to the tolerance. Please modify your circuit if it doesn't work and report let me know if after that it is working. Please remember that the RC must be switched on before connecting the interface to the PC and that your PC must be already switched on. I'm still working also on this bugfix.
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