DAQ Analog Input Channel Readings

[laps682]

Hello, I have the following DAQ (http://www.ni.com/pdf/manuals/374369a.pdf). 

I created a VI to read 4 analog input channels, and I only wired the ai0 channel only. However, the other three channels are still showing readings on the numeric indicators. 

How do I update my code such that the VI recognizes that nothing is hooked up to these channels and subsequently displays something like "N/A"?

Thank you.

[crossrulz]

What are the readings you are seeing?  If you command the DAQ to read from a channel, it will read it regardless if something is wired up.  Ideally, you should just be measuring noise.  But you may be seeing "ghosting" as well (How Do I Eliminate Ghosting from My Measurements?).