cDAQ-9184 Not Responding to Tests

[lanky0211]

I am using an air velocity transmitter to record velocity of air using voltage. I am currently trying to feed this data to a LabVIEW code that converts this data from velocity to flow rate and records. However, I am having difficulties with the DAQ Hardware. I am using an NI-9237 with DSUB plugged into an NI cDAQ-9184 plugged into power supply and my computer via ethernet. I believe everything is wired correctly in the DSUB and whenever I run tests by crudly blowing air into the transmitter, I get no data. It's all formatted correctly but returns 0s. My main concern I have is the fact that the NI-9184 has an "Active" LED on it that doesn't turn on during the tests. I've tested the transmitter and it is functioning correctly. I am properly connected to the 9184 according to NI MAX.  An error I keep receieving is Error -200431 where the code doesn't seem to agree with the type of analog input (Voltage) I select for the DAQ Create Channel command. Any help is appreciated!

[santo_13 · Accepted solution]

NI 9237 is a strain/bridge input module and you used voltage input task in your code.

Your c-series module supports only bridge measurement type and not typical voltage input.

[lanky0211]

That definitely got me somwhere, thank you! I changed that input to be an analog bridge input with the units of Volts/Volt. Then, had to add a sample clock with continuous sampling for my purposes. The "active" LED now activates on the cDAQ! Now, I still get zeros for my data but that might just be due to the way I'm testing my air velocity transmitter.