How to check if a physical data channel has data on it

I am aquiring data continuously and am trying to check if there is data on the physical line, if there is digital data I want it to be passed to the next stage, if there is not I want the data diguarded. Is there a way of checking this digital line for inactivity because when I suspend the data flow the clock continues to clock and my buffer just fills with empty data.
Thanks

You should get a timeout error from the DAQmx Read if there is no data availalbe. Are you not getting an error?
As for your consumer loop, there is no need to check to see if there is data in the queue. Just call the Dequeue Element. If there is no data in the queue, then it sleeps until there is data (assuming you don't use a timeout). It will then pass out the data as soon as it is available.
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How to check if a physical data channel has data on it

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