NI-DAQmx
Provides support for NI data acquisition and signal conditioning devices. 
NI-VISA
Provides support for Ethernet, GPIB, serial, USB, and other types of instruments. 
NI-488.2
Provides support for NI GPIB controllers and NI embedded controllers with GPIB ports.

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NI-9421

C Series Digital Module

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VIEW PRODUCT DETAILS Configure A Custom NI System

Use our online advisors to easily combine compatible chassis, controllers, and I/O modules in your preferred platform.

CompactRIO SYSTEM CompactDAQ SYSTEM

24 V, 8-Channel (Sinking Input), 100 µs C Series Digital Module—The NI‑9421 works with industrial logic levels and signals to connect directly to a wide array of industrial switches, transducers, and devices. Each channel is compatible with 24 V logic levels and has an LED indicating the state of that channel. The NI‑9421 offers isolation between the input channels and earth ground.