Virtual instrument software architecture (VISA) is a widely used application programming interface (API) in the test and measurement (T&M) industry for communicating with instruments from a computer. VISA is an industry standard implemented by several T&M companies, such as, Anritsu, Bustec, Keysight Technologies, Kikusui, National Instruments, Rohde & Schwarz, and Tektronix. [https://en.wikipedia.org/wiki/Virtual_instrument_software_architecture]

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[http://tclvisa.sourceforge.net/%|%tclvisa] – Tcl binding to VISA API

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