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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PXI-6511

PXI Digital I/O Module

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64-Channel, ±30 VDC, Sink/Source Inputs, Bank-Isolated PXI Digital I/O Module—The PXI‑6511 is an industrial digital input interface, with eight banks of isolated channels. If a computer or application fault occurs, the PXI‑6511 can use digital I/O watchdogs to switch to a configurable safe output state to ensure detection and safe recovery from fault conditions. Programmable input filters eliminate glitches/spikes and provide debouncing for digital switches/relays through a software-selectable digital filter.