Unable to connect from PC via USB.

Check if the USB driver is properly installed.

<How to check>
When the software is connected to the main unit and the power is turned on, you should see “Graphtec GL/MT/DM/WR Series” in the USB Controller section of the Controller -> Device Manager -> USB Controller on your PC. This indicates that the USB driver has been installed correctly. If you don’t see it, it’s likely that the USB driver was not installed correctly, and you should reinstall it.