Viewsonic TD2220 User Manual

1. Before using the touch function, make sure the USB cable is connected and the Windows 7 

operating system is started.

2. When the touch function is active, make sure there is no foreign object in the areas 

encircled in the figure below.

Make sure there is no foreign object in the encircled areas.

Note: 

        1.    

The touch function may need about 7 seconds to resume if the USB cable is

                re-plugged or the computer resumes from sleep mode.

        2.    

Windows XP and Windows Vista do not support touchscreen functions. 

                The touchscreen can only detect up to two fingers simultaneously.