Why isn't my Master Arm not connecting to Reach Control on Linux?

When connecting a Master Arm to Reach Control Linux via a /dev/ttyUSB port, ensure that the Master Arm is physically connected to the computer and the port has been assigned before creating the port and device in Reach Control.

If you create the port in Reach Control first, the /dev/ttyUSB port may not appear in the list once the Master Arm is connected, and the connection to Reach Control will not work.