6602 Arm Trigger to Sync Multiple Tasks

I am using a 6602 card to read the period of multiple TTL square waves.  I am doing this through Matlab using the DAQmx functions.  I was able to read the period on one channel perfectly fine.
To check the robustness of the code, I tried reading the same TTL wave through two different counters.  The counters were put into seperate tasks, therefore using two StartTask functions.  i noticed this caused the tasks to be offset by 15 or so samples.
I believe I should be using an arm trigger to sync the two tasks.  I cannot find an arm trigger function for a 6602 to use in Matlab,though.  Is there an arm function or should I take another route?

Thanks for the response Gerardo,
I am now collecting the samples continuously.  This yielded simultaneously running tasks that are just delayed from one another (which is almost what I want).  I was running finite before, but am no longer.
I tried using DAQmxCfgDigEdgeStartTrig but was not successful.  I've attached my Matlab code (as a .txt) with the attempted trigger is clearly labeled.  I was trying to run an internal trigger or sorts.  I am probably way off on this assumption, though.  I was thinking I could generate a pulse signal to counter2 and use that as the trigger signal.  How wrong is that?
-Mike
Attachments:
contper.txt ‏4 KB

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