I am looking for a product that will allow dry contacts (for an emergency stop button) that when triggered will send a command through ACN (ETC Net 3 in this case) back to the board that will trigger a macro and/or a cue. Does anyone know of such a product? Preferably cheap (under $100) as I am thinking 3 of them would be handy. I am not 100% tied to using ACN but that would be the easiest way to connect everything since the cable and hardware is already in place. I am also interested if there would be a way to build something using an arduino or STAMP or some other chipset.