Connect MaximDL via POTH Hub (Observatory Control -> Setup)
Verify if camera and focuser are the right ones! (i.e. SBIG Universal)
Camera control -> Setup
Start FocusMax (optional)
Connect Focuser via POTH Hub (System -> Focuser -> POTH Hub -> Connect) - Important: make sure to connect, otherwise FocusMax can crash when you click the Telescope Button!