ELO Remote OSD key wiring?
 

Hello, does anyone know what the innards are for the remote OSD controller
for ELO touchscreen LCD monitors?

There are four buttons on the case, and a PS2 connector on the cable, and I
have only the monitor. I haven't needed to adjust it, but I still want to try
it. I'm guessing it might be just a common ground and a wire to each of four
buttons, but if anyone knows what's really in there, please post a
description.