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Why is my PXI-6534 causing PC hangup problems?

I'm developing a dll in LabWindows CVI for automatic testing with TestStand.

My application is pretty simple. I configured group 2 (w/ port 2 and 3) as input and I'm using port 0 as output. I need to aquire a fixed amount of data when I detect a hardware stop trigger. For setting up the stop trigger, I'm calling DIG_Block_PG_Config, DIG_Trigger_Config and DIG_Block_In functions. To see if the data transfer is completed, I'm using DIG_Block_Check function. Everything is working fine but the problem is only when the rate is 10MHz and the number of data points is < 100. In this case, I see that the Rx & Tx LEDs on the DAQ card are ON all the time and my system just hangs up. What can be the possible reasons for this?

I'm attaching my program.
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Hi,

Do you get the problem while trying any examples from c:\program files\national instruments\ni-daq\examples\visualc\di ?

Please do let me know the example. I would definitely try to reproduce it.

Sincerely,
Sastry
Applications Engineer
National Instruments
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