Re: ELO Remote OSD key wiring?

On Thu, 07 May 2009 15:04:59 -0500, Lostgallifreyan
<no-one@xxxxxxxxxxx> put finger to keyboard and composed:

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.

I can't help with the pinout, but you should be able to discover
something about the 6-pin (?) DIN port by measuring the voltages.

One pin will most likely be connected to ground. If the other pins are
connected to switches, then they will most probably have pullup
resistors connecting to +5V or whatever supply is applicable.

Let's say the pullups are 4K7. With the monitor powered down, you will
probably measure 9K4 between any two switch inputs. If you measure
4K7, then one pin must be connected to the supply.

You can find the supply pin by loading each input with a resistor, say
1K. The supply pin's voltage will remain constant whereas the switch
pins will droop.

- Franc Zabkar
--
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