Solution
With LabVIEW 8.5 or later and NI-RIO 2.4 or later, this can be done by changing the Calibration Mode (Raw or Calibrated) in the properties of the C Series module. This can be done in the Project Explorer window by right-clicking the module and selecting
Properties:
When you toggle between Raw and Calibrated, the I/O nodes on the block diagram will change between Blue and Grey, representing Raw and Calibrated, respectively.