NATIONAL INSTRUMENTS NI DAQ PCI-6221 191329C-03L Multifunction I/O CardNational Instruments NI DAQ PCI 6221 191329C 03L Multifunction I O Card The NI PCI 6221 is a multifunction data acquisition card designed for mixed signal measurement, control, and automation tasks. It integrates analog input, analog output, digital I O, and counter timer functions on a single PCI board. With its high resolution ADC, stable timing architecture, and flexible software configuration through NI DAQmx, it supports precise data capture and