Hi Russell,

of course I use Prolific Converter :(
I will test FTDI. USB to Serial: there are USB to RS232 and USB to TTL converters. There is a difference in logic levels.
I remember now, that I had some issue to add a DIY bluetooth serial adapter to Sitech II Controller. Taj explained, that the controller uses RS232, but some converters simply use TTL.
This could be an explanation for the incorrect / incomplete communication. Does anyone know?

Ralf