Add your user to the dialout group, then log out and back in. See
Flex Control knob.
Antenna Genius XL problems
For a prologue timeout, a password prompt, or a missing device, see
Antenna Genius XL.
Power Genius XL fan control is missing
Fan control works on the local network only, not over SmartLink. A firewall
between the computer and the amplifier must allow TCP port 9008. See
Radio Setup - External.