Re: You know...

You need a better USB-Serial adapter then.

The real problem with these USB serial ports is that most don't actually support all the signalling lines and 'standard' baud rates. It's really hard to tell whether or not a given one will work either.

If your device needs 9600/8-N-1 and no flow control, you'll be fine. Anything else...

The quality is also extremely variable - I've used some really great ones and some real dogs.