[NI PCI-6509] Read Digital Input is always showing "true"

Hi All,

I have installed a NI PCI-6509 DAQ and am testing it using the sample source codes (ReadDigitalChannel) provided by the NI-DAQmx installer DVD. I am using Visual Studio 2013 Professional with NI-DAQmx 15.0.

When I run this sample code, I find that "Dev1/port0/line0:7" always reads "true" on all lines even though there is no input provided.

I was expecting the values to be read "false" as there is no input to the DAQ. Is this normal or am I missing something?

thanks