Handles manual display source selection from the UCI.

1. Source Selection: Manual source selection from the UCI.
2. Source Start: Sets where the first source is connected on the video switch. In the example, HDMI 1 on the NV-32 is source #4.
3. No Source: Fallback value when no source is selected.
4. Output Selection (read-only): Current value of the Output Selection output.
5. Clear: Deselects all sources.

Wiring and examples

First source selected.

Last source selected.

Clear selection and fall back to No Source