I am trying to connect to my SDC2150 via USB, but without success. Roborun+ says: Found COM3 - COM3 is closed. Is there anything which needs to be configured at the PC side?
verify that when you unplug the controller, COM3 disapears.
if it disapears, that would mean that the controller driver correctly loaded and that it should be able to communicate with the PC utility
if COM3 is still present, then this means that the controller never was found by the PC and that there may be a problem with the controller, cable or PC