Normally when I plug a CDC serial USB device, I get a device like
/dev/cu.usbmodem1411. A remote user I'm supporting who's having difficulty with a serial device is reporting a device with
FD in the name:
/dev/cu.usbmodemFD211 (on a Macbook Air of unknown vintage running 10.13.4)?
What's the meaning of the
FD? I've done a websearch but turned up nothing, though some people mention a lower-case
fd instead. I know the digits just signify the controller, port, etc.