4)Click 
This will Install the USB-RS232 connection cable driver.
5)Once connected correctly, in My Computer-Device Manager, you will see the device “CP210X USB to UART Bridge Controller,” as shown in the following figure:
When USB-RS232 connection cable is used to connect the electronic whiteboard to the computer, the driver for USB-RS232 connection cable must be installed. Otherwise, the data communication between the interactive whiteboard and the computer can’t be realized.
