Measurement system with MATLAB real-time windows target and NI PCI boards
Maybe this link could provide you some useful information: https://stackoverflow.com/questions/3268389/data-acquisition-toolbox-for-matlab

Have you tried the setup yet? What does it report?

Can be that the hardware board itself is not perfectly supported but I could see that sill worth of trying. With MATLAB's Data Acquisition Toolbox you can do several things. 

If you get the drivers right with the SC-2345 board you could read the data and use some medium between the SC-board and MATLAB. Of course the real time solution may then suffer loss of speed but at least the data could be available.

In practice: The medium between MATLAB and SC-board could be a temporary file like .txt or something that SC-board writes and MATLAB reads in sequence.

Myself I have been using just LabView with its DAQ-systems.