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-9971

Backshell

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Quantity of 4, 2-Position C Series Module Backshell—The NI-9971 includes four backshells that provide strain relief and operator protection from high-voltage signals for 3- or 4-channel 2-position modules. You can use the NI-9971 with the NI-9976 Terminal Block Plug.