chas@CNC:~/Documents$ halrun
halcmd: loadusr -W hy_vfd -d /dev/ttyUSB0
open: Input/output error
ERROR Can't open the device /dev/ttyUSB0 (errno 5)
hy_vfd: ERROR: couldn't open serial device
<stdin>:1: waitpid failed hy_vfd hy_vfd
<stdin>:1: hy_vfd exited without becoming ready