16 AI (16-Bit, 250 kS/s), 2 AO (833 kS/s), 24 DIO USB Multifunction I/O Device—The USB‑6221 offers analog I/O, correlated digital I/O, two 32‑bit counters/timers, and digital triggering. The device delivers low-cost, reliable DAQ capabilities in a wide range of applications from simple applications in laboratory automation, research, design verification/test, and manufacturing test. You can add sensor and high-voltage measurement capability to your device with SCC or SCXI signal conditioning modules. The included NI‑DAQmx driver and configuration utility simplifies configuration and measurements.