The default data format for date collected in transient mode is *.cdf. These are NetCDF files and are often be converted to text files for plotting and analysis.
NASA provides a web-based converter that works limited data translation tasks (NASA NetCDF translator).
Alternatively, we have written a labview-based translator that will run on a Mac or Windows Machine:
LabView Code: NetCDF to ASCII LV.vi
Windows Compiled Code: Net CDF to ASCII PC.zip (link to PC runtime is contained in the zip file)