Set the Calibration Mode to Calibrated in the C Series Module Properties dialog box for the NI 9224 if you want the FPGA I/O Node to return calibrated, fixed-point data from the module in units of volts.

Set the Calibration Mode to Raw if you want the FPGA I/O Node to return calibrated, binary data from the module. If you set the Calibration Mode to Raw, convert the binary values to engineering units. Convert these values in the host VI.

Using an Equation to Convert Binary Values to Voltage

Use the following equation in the host VI to convert binary voltage values to volts:

Voltage = Binary Value × 1257533 pV/LSB

Where
  • Binary Value is the value returned by the FPGA I/O Node.