Programming USB Devices

Application Notes

Most users of test and measurement (T&M) equipment are familiar with programming an instrument over GPIB/IEEE-488. However, now that USB instruments from companies like Keysight Technologies, Inc. are beginning to appear with USB interfaces, many users may want to try USB instead of GPIB. This is because of the ease-of-use and performance advantages of USB when compared with GPIB and other I/O interfaces used in T&M. This article will provide information on how to set up a test system that includes USB instruments and how to program the USB instruments using Virtual Instrument Software Architecture (VISA) I/O library software. Information is also presented about the T&M USB protocol specifications, and how these protocol specifications make use of USB endpoints. Two programming examples are available. One example shows how to use VISA to download an arbitrary waveform to the Keysight 33220A. Another example shows how to use Visual Basic to program the Keysight 33220A to execute a frequency sweep. Both of these Programming USB Instruments examples are available from www. keysight.com/find/33220a in the Drivers and Software section of Technical Support.

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