I'm not quite sure what you mean. If you mean that the A/D card delivers no values when there's nothing connected, then I'd contact whoever sells the card. If you mean that the LabVIEW function doesn't work without wiring channels to it, then I agree it doesn't work.
You need to wire a channel to the function to let it know from which hardware channel of your A/d board to read. If there's nothing physically connected to the card, you'll measure noise. Hope this helps Shane
