I have a quick question on the W32 IO Board's analog input. Right now, all 8 inputs with nothing connected show around 700-800 for their values on the analog input value on the webpage. With nothing connected, the 10-turn pots do not impact the values. Connecting A-GND or A-5V to an analog input also has no impact. Is there something I need to do to get these inputs to work? Do I need to add resistors or something?