> If I have a PC program that accesses a serial port. I have a 
> PC with no serial port, but do have a USB port. Can I make 
> the USB port into a serial port with one of those USB/serial 
> port adaptors. The question is can I make the program send 
> and recieve data to the USB port when no serial port is present.

Yes, that is what usb/serial converters with their VCP (virtual
communication port) drivers are for. but
- you must use the windows calls to access the serial port (not direct
hardware access)
- there will be some timing differences, which might affect what you are
trying to do.

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu
 

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