Oklahoma Mesonet

I used to have two different Oklahoma Mesonet scripts, each of which decoded a different data file. However, one of them (which used a *.csv file) no longer works. The working script uses the latest MDF file from the Oklahoma Climatological Survey. What are the differences between the CSV file and the MDF file? The CSV file contained the dewpoint and sea-level pressure, while the MDF file does not contain the dewpoint (meaning that the Td must be calculated from pressure, temperature, and relative humidity) and the sea-level pressure (it contains the station pressure). On the good side, however, is that the MDF file updates every 5 minutes. Regardless, for server resource and bandwidth issues, I've set the refresh time to be twice that. Update frequency: 10 minutes.