Set the Scaling Mode to Scaled in the RIO Mezzanine Card Properties dialog box for the NI 9684 if you want the FPGA I/O Node to accept fixed-point data in volts when writing to the device. If you set the Scaling Mode to Raw, the FPGA I/O Node accepts only binary values. You can convert output voltage values to binary values using the following equation. You must convert these values in the host VI.

Binary Value = Volts × 4096 ÷ 5 V

Table 663.
where Binary Value is the value you write to the FPGA I/O Node