Tendzone TYCHO T 1212/CA - Manual (Page 21)

If the state of the switch in the above chart is changed from “open” to “closed”, the level of PIN-16 will be changed from
“high level” to “low level”, and then a falling edge will be formed so that the matrix will load Scene 4 automatically.
If the state of the switch in the above chart is changed from “closed” to “open”, the level of PIN-16 will be changed from
“low level” to “high level”, and then a rising edge will be formed so that the matrix will remain the same.
Example 2:
As is shown in the chart, PIN-16 (i.e. RI 1) and PIN-15(grounding) are connected to a 3.3-12 V output system,
And then select Mixer Setting for RI 1 on the PC: