Hello Madhvi,
If you are doing a finite acquisition, is it possible to do a one-time read of all the samples from the buffer? Are you using external/internal timing? Are you using a timeout for your read function? What are the characteristics of your trigger signal?
I'm not to familiar with the MATLAB DAQ functions. I would definitely suggest that you give Mathworks a call as well.
Take care,
E.Lee
Eric
DE For Life!