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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cRIO-9940

Backshell

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36-Position, Spring Terminal C Series Module Backshell—The cRIO-9940 provides strain relief and operator protection from high-voltage signals for 36-position C Series modules with spring terminals. You can use the cRIO-9940 with the cRIO-9974 Terminal Block Plug.