Wiring the Multiplexer:
The multiplexer supports 3 distinct switch inputs. These inputs should be directly wired to the multiplexer via the SI (Switch Input) terminals and the GD (Ground) terminals next to them i.e both legs of the switch go to the multiplexer.
A 5V supply should be provided to the multiplexer via the 5V terminal and a analogue ground should be connected to the GD (Ground) terminal opposite the 5V terminal.
The VO (Voltage Output) terminal should be wired to the analogue input on the controller or similar and provides a specific voltage output for each switch combination.