When connecting your ViewSonic TD-Series monitor or touch display to your PC both video cable and USB cable must be connected
Video Cable (HDMI, VGA, DVI) - Available video input will vary depending on the model, connect the appropriate video cable between the display and computer
USB Cable (USB Type B to USB Type A) - The USB cable is connected to use the touch feature of the display as well as the additional USB port on the display (if available)
Example: TD2210