If you are generating a continuous pulse train then you are probably using only one of the counters on the 6025E. Depending on the speed of the pulse train being generated, you will want to use simple event counting or buffered event counting. There are shipping examples within LabVIEW that perform both operations. The Count Edges (DAQ-STC) VI would work if the pulse train was slow enough. If the pulse train has a high frequency, you will want to use the Count Buffered Edges (DAQ-STC) VI so you'll be sure not to miss any edges. I hope this helps.
Regards.
Todd D.