1746-hsce2 counter running flat

Hi,
I have configured 1746-HSCE2 for CLASS 4 operation for three counters. They are wired to [A1+,A1-],[A2+,A2],[B2+,B2-]. I want to perform some calculation depending on which counter is running. How do I determine which counter is running? Is there any flag set in the output file of the card when particular counter is running? or is there any other way to implement in the code to find out that counter 1, counter 2 or counter3 is running

I appreciate all the help.

Thanks,

The rate value for the counters is available in the input table. If it is guaranteed that only one is running then whichever rate is non-zero gives you the information.