Developer walk-through for the "rt_event-irq" LabVIEW project available for download at https://learn-cf.ni.com/teach/riodevg... that covers this topic: "Run a callback VI each time that a digital input transition or an analog input voltage threshold crossing generates an interrupt request (IRQ)." See the "RIO Developer Essentials Guide for Academia" available at https://learn-cf.ni.com/teach/riodevg... for more video tutorials related to programming, architecting, and networking with LabVIEW and NI Academic RIO products.