What software/development tool are you using the program the card? If you are using the NI-DAQ driver (which you should if it supports your operating system) it will take care of everything for you. If you are trying to program the card directly using its registers you need to be familiar with low-level and driver-level programming before attempting to do this.
This
link provides the 1200 RLP manual.
authored byChristian L, CLA
Systems Engineering Manager - Automotive and Transportation
NI - Austin, TX