AV.io 4K User Guide
Indicator LED details
Indicator LED details
The color and action of the indicator LED depends on whether you are connected by USB 3.0 or USB 2.0. For
maximum performance, always use a USB 3.0 port and the included USB 3.0 cable. Note that frame capture
rate will be reduced when connected via USB 2.0, and it is likely that any attempt to use 4K resolutions with
USB 2.0 will be unstable.
From the operating system's UVC drivers, the application will receive the AV.io 4K supported color space,
resolution and frame rates. If you’re not sure if your controller is USB 3.0 or USB 2.0, plug AV.io 4K into the
capture computer and look at the indicator LED. After initial boot up (red LED), blue is used for USB 3.0 and
green is used for USB 2.0:
Blue LED means USB 3.0
Green LED means USB 2.0
Connection type/LED color
USB 3.0 connection
USB 2.0 connection
Solid red
Firmware update in progress
AV.io 4K initializing
Firmware update in progress
AV.io 4K initializing
Solid green
N/A
USB 2.0 connection active
Blinking green
N/A
Video and/or audio
transferring successfully
Solid blue
USB 3.0 connection active
N/A
Blinking blue
Video and/or audio
transferring successfully
N/A
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