How does the serial pass-through device work?
The physical set-up is that you connect a cable (provided) from your PC to the RoboFocus controller and another cable (also provided) between RoboFocus and the scope. Both the scope and RoboFocus software will be running on your PC. Each program will have a menu item for opening/closing the COM port, so you switch between programs by controlling which is open on the port.