VISA provides a very simple-to-use API that has bus independent functions for most of its I/O functionality. VISA’s greatest advantage is that it is an extremely easy language to learn. This can make it easy to switch interfaces and also gives the users who must program instruments for different interfaces a single language they can learn. Thus, VISA provides interface independence. For example, the VISA command to write an ASCII string to a message-based instrument is the same whether the instrument is Serial, GPIB, or USB. One of VISA’s advantages is that it uses many of the same operations to communicate with instruments regardless of the interface type. It provides a consistent and easy to use command set to communicate with a variety of instruments. You can use NI-VISA to communicate with most instrumentation buses including GPIB, USB, Serial, and Ethernet. In this blog post I will give an overview of National Instruments’ implementation of the Virtual Instrument Software Architecture API, commonly referred to as NI-VISA. NI VISA is utilized by LINX in order to communicate with the WF32 and the other supported boards.
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