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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TB-2621

Terminal Block

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37-Pin Female D-Sub to 37-Pin Female Screw Terminal, PXI Module Mount Terminal Block—The TB-2621 provides an industrial PXI front-mounting terminal block for 37-pin D-SUB modules such as the PXI-6521 PXI Digital I/O Module. It features a 150 V CAT II rating, 2 A max current, screw-terminal connectivity, and a strain-relief bar.