I used /dev/cu.USA1911P1.1 on my Keyspan USB19A single port serial converter. Notice the "cu" instead of "tty". Cheers, Dave, N1BHX = On Monday, June 9, 2003, at 01:57 PM, Christian F1GWR wrote: > I type in TNC Port : /dev/tty.USA28X11P1.1