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Well, tested and works... but
I connected it to an UNO at 5V and with filament inside sends signal between 4,80v and 4,20v depending on the filament, being 4,20 a translucent grey.
I also tested...

YES!!! when I brought the printer home I found a part on the floor and kept it apart. Now I have seen this picture in reprap, I realised it belonged to the CON.

So, for what I have seen, CON, U1...

well well well, after a session of backlight on the PCB I got a scheme. Red on one side. turquoise on the other.
By the position the pcb is mounted on the extruder, CON1 and CON2 seem to check if...

well, take into account it is a 3d systems component, so drivers is the last thing I expect to find.

It is located behind the extruder wheels. t looks like CON1 checks one wheel and CON2 checks...

I'm trying to put every original device to work on a converted cube.

Does anyone have a clue on how to connect and code the original filament runout sensor to work with marlin?