NuDAQ PCI- 9113A User Manual page 40

32 channels isolated analog input card
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Under this mode, an interrupt signal is generated when FIFO becomes
half-full. It means there are 512 words data in the FIFO already. The ISR
can read a block of data every interrupt occurring. This method is very
convenient to read A/D in size of a "block" (512 words) and it is benefit for
software programming.
30
Operation Theorem

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