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PCI6509做输出给USB6509做change detection信号

Currently I use PCI 6509 as output signal to USB-6509(USB2.0). The Rising Edge Line is PORT0-LINE0 as change detection signal for USB6509.
But I found when I ran it as while loop... it would show: overflow or not able to detect change detection signal.
I tried enlarge the cycle of the pulse signal from PCI6509. Only get less error but still error.
What should I do now? seems not only speed issue.
 
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Hi taiqi,
 
There is a continuous change detection DI reading example in LabVIEW's example finder. Its name is Read Dig Chan-Change Detection.vi. You could find it in Hardware Input and Output -> DAQmx -> Digital Measurement fold.
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