ferdimh@gmx.de wrote: > In case of a self-sync byte, the shift register will be shifted 10 > times before a 1 appears so the sync mechanism also works. How will the PC be able to detect the length of a byte (8, 9 or 10 bits)? IMHO this is a must. Though admittedly I'm not so sure I understand your circuit in the first place. -- Linards Ticmanis