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6602 6612 differences

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I have a project using a 6602 PCI to collect 2 arrays of time stamps of pulses from 2 encoders using DAQmx.dll i.e. .NET. c#.  In order to synchronize the 2 encoder tasks data for comparison, I create a "starter" task that is triggered by a digital edge trigger (a PFI).  Then I create a task for each encoder and make their digital edge triggers point to the output of the "start" task.  This is all working very well.  Now I have a new 6612 counter card and thought I could drop it in as a replacement, but instead I am getting the following error:

 

"The specified resource is reserved. The operation could not be completed as specified.

Task Name: _unnamedTask<0>

Status Code: -50103"

 

What difference between the 2 cards could be causing this?  I have looked for differences between the 6602 and 6612 but have only found where 6612 can handle more instead of less. 

 

Thanks for your time.

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Accepted by topic author MrSethT

They are interchangeable.  The same time I was swapping out the 6602 for the 6612 I accidentally changed one of the encoder tasks from a LowFrequencyOneCounter to a HighFrequencyTwoCounter.  It was just a dumb mistake.

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