To my knowledge nobody has yet built a cable using this as a reference so please double check everything yourself in case there are any mistakes. My suggestion when doing the wiring is to connect as many ground wires between the display and the controller board as possible and keep the ground wires close to the signal wires.
I wired up my EL 640.200 and it works perfekt, thanks for the schematics.
My conector 24 is also conected with a "poti",thanks mash.m for the Tip.
Detail connected Potentiometer
Some more Pictures are HERE