Today I tried to input an analog voltage with a potentiometer into pins C & D using the 5V ref and ground. This first picture shows the display before I detented the SCV control lever
This is what is shows after clicking the detent with the pot centered
And these last show show the indicator arrow moves up/down as I turn the pot.
If I turn the pot too high or low it goes back to displaying EC and then after clicking the detent again, it goes back to AC with the indicator arrow.
So from my limited experience/knowledge, it looks like it’s working except there is no output from the hydraulic remote port while I’m turning the pot back and forth. It does nothing when I press the retract/extend SET buttons.
Edit
The tractor needs to be driving/moving to activate the hyd valve