Garmin - Jeppesen Flitestar Connection

I know this has been discussed here before but I'm still not able to
connect my Garmin III Pilot to the Jeppesen FliteStar program I have
on my laptop. The problem of course is the serial-USB adapter which I
have to use since modern laptops do not have old style serial
connections anymore. If someone has been successful, what exactly was
the configuration (COM, baud rate, format [Garmin or NMEA for example]
etc.) and which was the *exact* serial-USB adapter being used?

Thanks,
Gerd