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Feature extraction from a serial UART source

Hello,

I am trying to extract ECG features similar to the toolkit example "ECG feature Extractor.vi". However, I want to insert signals acquired directly from a serial device, without writing and reading from TDMS files. I tried wiring them directly, but it keeps giving an error that the sampling frequency must be greater than zero and less than the Nyquist frequency even though I am feeding Fs. Any advice?

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Can you attach the VI?

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