Karan,
This was also posted to the LabVIEW General forum and answers were given to that post. If none of those answers are satisfactory, then all I have to add is to call the board's driver DLL using the Call Library Function Node in Functions»Advanced. What functions you need to call should be found in the documentation for the board.
Randy Hoskin
Applications Engineer
National Instruments
http://www.ni.com/ask