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USB-8451 OEM Specifications - National Instruments
779553-01 NI | Test and Measurement | DigiKey
NI USB-8452 | National Instruments | Artisan - Price, Specs
781964-02 NI | Test and Measurement | DigiKey
How to perform Serial Peripheral Interface (SPI) communication with a data acquisition device using C# and the National Instruments DAQmx API. - CodeProject
Frequently Asked Questions: NI USB-8451 & SPI - NI