Analog Input Module Values Question

[Daitomodachi]

So I started to use the C-Rio for the my research. I connected a simple 7805 module to A0 of my 9222 module. I was expecting digital values, but it seems like I am getting the actual voltage value. Does the 9222 module automatic convert the digital value to the voltage value, or did I do something silly?

[JKSH]

Hello,

I couldn't find anything about a 7805 module, but I presume you meant a Digital I/O module?

A digital signal is still an electrical signal, and it exists in the real world as real voltages (e.g. '0' = 0 V and '1' = 5 V). So, the value in your screenshot (-0.00017) looks like the voltage that represents a '0' bit, plus some electrical noise.

Your NI 9222 doesn't know what it's connected to, and it doesn't understand digital signals -- it just reads and reports whatever voltage is presented at its input.