OK guys...I am getting ready to install an interface module to run a Poldragonet Master Caution, Fire Warning, and Sixpack. The unit is mounted on a PCB board with an output consisting of 16 pins.I have purchased the connectors and ribbon cable. Now I need to know what type of I/O unit I need. I want oviously to get something that works, BUT is lthe lowest price. This unit of course has leds, and switches. What voltage the leds are is anyones guess as NO instructions came with the unit. I can only assume it's (hopefully) 5 dc volts or less. I've had this unit for well over a year and never had the courage to tackle it. Anyone use the Pol unit?, and if so what card do I need? Thanks Again for any suggestions. Dave