Hi Ian,
Is the status LED blinking? The blinking LED is an indication the device is receiving power through the USB.
Please double check the assigned COM Port. If it is not COM 4, please use the pulldown menu on the top left of the GUI to select the correct port.
Finally, please close and re-open the GUI. We have seen occasions where the GUI did not come up the first time, even after a few minutes.
Is the status LED blinking? The blinking LED is an indication the device is receiving power through the USB.
Please double check the assigned COM Port. If it is not COM 4, please use the pulldown menu on the top left of the GUI to select the correct port.
Finally, please close and re-open the GUI. We have seen occasions where the GUI did not come up the first time, even after a few minutes.