There are several potential reasons why there are no communications between the computer and the ATI Hub. Also see the Help instructions in ATI Vision's User Guide for further description of how to use the ATI Hub.
Check that the “Power LED” on the ATI Hub is illuminated.
Check that the “Power switch” is in the ON position (pointing upwards).
Check that the 12V DC is applied on the power connector at the back of the ATI Hub.
Check the fuse at the back of the ATI Hub is intact.
Ensure ATI Hub is powered on (see Section 7.2.2, “Possible causes”).
Check that the USB cable between the ATI hub and the computer is connected properly.
Ensure that the correct USB driver is installed on the computer (contact ATI Technical Support for more details about the correct USB driver).