Wouter,

On Wed, 28 Sep 2005 16:11:20 +0200, Wouter van Ooijen wrote:

> USB specialists around: what *is* important here?
> - OS
> - driver
> - usb/serial hardware
> 
> anything else?

Well I'm no expert, but sitting back and watching this thread, the evidence seems to say that the driver is 
the culprit.  The hardware (USB-Serial adaptor) is the same, UARTS don't decide anything, they just do what 
they're told.  Win2k and XP are both NT-derived operating systems and underneath the glitz are very similar, 
especially for something as mature as serial ports.  The drivers, however, can come from several places (the 
chip manufacturer, the device manufacturer, third parties, Microsoft) and I think the answer is to find a 
driver that works and test it on different machines/environments.  I  believe that will give you the answer.  

I think it's likely that someone, somewhere, when writing a driver made the decision not to send data out 
unless there was something there to send it to, and that's wrong in the situation you are in, so using drivers 
which don't do that would be the solution.  You appear to have one - send a copy to Olin, perhaps?

Cheers,


Howard Winter
St.Albans, England


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