Error 8020: Error reading comm device

As described by Microsoft,

this error message is the result of a defective serial port device driver. It should be resolved by by obtaining an updated device driver from your serial port or USB adapter manufacturer

Windows 10

Some USB devices that emulate serial ports employ the usbser.sys driver. Unfortunately, the version of usbser.sys included with Windows 10 is defective, resulting DXLab applications reporting an 8020 error when they attempt to communicate with such devices.

Post a question or suggestion on the DXLab reflector

Transceiver Control

Getting Started with DXLab