measuring resistance but value is not constant

[Zancis]

I used two known resistances to check, if my programme is right. Resistances are 400 Ohms. I made shema, which I drew (Only I replace 9 pin to 10 pin). I wrote the programme which generate 10 voltage in output and  reads voltage in all channels. My question is - why voltage in 10 pin is about 0? I added printscreen. 

I'm waiting for answer.  🙂

[crossrulz · Accepted solution]

Because it is tied to the AI GND.  It should be at 0V.