Sorry this is so off topic, but it seemed a good group to ask:

I need to write a diagnostic program that will "speak" through the serial
port on a PC, this is for testing a piece of hardware during
manufacturing. The people using this program only have PCs, no
Macintoshes, but I'm very much a Mac programmer.

The bulk of the program will be stdio-based C, real standard stuff that
should port with no difficulties. But I don't know squat about PC serial
ports, and I'm hoping there's a library out there somewhere that will let
me set up the parameters (baud rate, parity, etc.) and then just merrily
spit and suck bytes without having to know anything about the details.
Does anyone know if such a thing exists? Any leads would be greatly
appreciated.

Dave Johnson