Configure the serial port in virtualbox in windows

In windows, virtualbox configures the serial port to read data from the serial port of the embedded device. In virtualbox, enabling the serial port com1 of the physical machine fails.

Finally, I found some points of attention from others and put them down. 1. ensure that the USB device is enabled first (I do not know if it is required, but I do) 2. in the "Settings-system-Extended features" column, the option "enable I/O APIC" is deselected by default. We should select this option now. 3. in "Settings-network", start the network connection and select Bridged Adapter for the connection method. 4. in "Settings-serial port", set the serial port parameter: port number -- select as needed. The default value is COM1. The port mode is Host Device, and the port file location is com1.