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Unable to acquire single point 12bit data @200KHz in Rtos.

I want to acquire single point 12 bit data @ 200Khz using PXIe 6535 DIO, PXIe 1072 chasis and 8820 controller in RT. Problem is I am unable to acquire data as triggered input. Loop execution time takes ~10us (measured using rt tick count). Thus I misses the samples. Am I missing something? What are the proper ways to acquire digital data in RT?

Also I am wondering whether I can use the SMB connector of 8820 controller as my acquision trigger input pulse. I am completely new to RT. Any help will be appriciated.

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