As all of you wrote, I tried using 19200-8-E-1 protocol to connect my weather station (now writing a little program for PC using freepascal...fast and lazy way ;-) ) and it seems to be tolerant to 1 or 2 stop bits, both for tx and rx.
So I'll try with SERIN and SERUOT as soon I'll have some time to spend (this weekend...I hope!). Fortunately I have to send only very small commands to ws ( four bytes or so... with fixed values), so also the "bit bang" idea (very nice!) may be useful...

Again, thanks a lot!

Marco.