
That is an EXCELLENT question, unfortunately, I do not have the answer to that one.
I am going to put in another call to the hardware gurus and see if any of them have any practical experience with manipulating a serial port.
Did you have a chance to look at the PCI Serial cards? Might give you another options.
Sorry Tek Tips wasn't any help.
Looking forward to your reply,
TTFN
LGW