Hello Gregg,
The 7831R board doesn't use the DAQ driver. Even though it is used for Data Acquisition, it is not really a DAQ board. It is an FPGA board. So the driver that it uses is the NI-RIO. The DAQ Assistant uses DAQmx driver which is not used for the FPGA boards.
For the FPGA boards you need to use the Device I/O VIs when targeted to the FPGA. Please remember that when using a RIO (Reconfigurable I/O) board you need to create a VI for the FPGA and most of the time, another VI for the host computer that will communicate to the FPGA VI.
You can check one of the tutorials we have. This
one can give you some idea.
Thank you
Ricardo S.
National Instruments.