Just a note on case.
While file names are not case sensitive on mac os, device names are.
The usb to serial adapters install /dev/tty.USB Serial and /dev/
cu.USB Serial devices.
The usb is capital, as is the S in serial.
Mine (the mtc one) put a space in the device name, which means it
needs to be quoted when used on the command line to cat or copy text
to it.
I don't know about the other ones such as keyspan or prolific, though
when I installed the prolific driver to try to get my mtc one to
work, it didn't change the names already installed, nor did it
creeate new ones, so I'm assuming it uses the same device names.
