On Wed, 15 Apr 2015 07:32:21 sd wrote: > It really looks like FreeBSD's kernel is messing up. If I get this to work > I'll post how I did it. you might try and use stty to set 'clocal' on the device to disable mo9dm control (you'll likely need to do something like "stty -f /dev/ttyACM0 clocal raw -echo" to avoid modem control when you run stty) Paul