- Aug 07, 2014 Use PyVISA to access a serial device. Normally I would use pyserial for this, but since I have a VISA dependency anyway, I prefer to minimize dependencies. Anyway, the following problem occurs on an 'openresource': Traceback (most recen.
- Non-standard values are also supported on some platforms (GNU/Linux, MAC OSX = Tiger, Windows). Though, even on these platforms some serial ports may reject non-standard values. Possible values for the parameter timeout which controls the behavior of read: timeout = None: wait forever / until requested number of bytes are received.
- Works fine in Mountain Lion 10.8.5. Install NI-VISA Runtime 5.4. Install pyvisa; First make an i386 binary of Python (mac os built-in) to force Python into 32-bit mode.
By comparison, the NI-VISA driver, once installed on my Mac, supports all our instruments so far and has none of these shortcomings. It also seems to be significantly faster than pyvisa-py. I do hope pyvisa-py gets continued development in the future: it is a great idea to have various back-end choices without changing the front-end pyvisa. May 27, 2020 PyVISA started as wrapper for the NI-VISA library and therefore you need to install National Instruments VISA library in your system. This works most of the time, for most people. But NI-VISA is a proprietary library that only works on certain systems. That is when PyVISA-py jumps in. Starting from version 1.6, PyVISA allows to use different.
PyVISA is a Python package that enables you to control all kinds of measurementdevices independently of the interface (e.g. Mockups 3 5 3 – collaborative wireframing for app development. GPIB, RS232, USB, Ethernet). Asan example, reading self-identification from a Keithley Multimeter with GPIBnumber 12 is as easy as three lines of Python code:
(That’s the whole program; really!) It works on Windows, Linux and Mac;with arbitrary adapters (e.g. National Instruments, Agilent, Tektronix,Stanford Research Systems).
General overview¶
The programming of measurement instruments can be real pain. There are manydifferent protocols, sent over many different interfaces and bus systems(e.g. GPIB, RS232, USB, Ethernet). For every programming language you wantto use, you have to find libraries that support both your device and its bussystem.
In order to ease this unfortunate situation, the Virtual Instrument SoftwareArchitecture (VISA) specification was defined in the middle of the 90ies.VISA is a standard for configuring, programming, and troubleshootinginstrumentation systems comprising GPIB, VXI, PXI, Serial, Ethernet, and/orUSB interfaces.
Today VISA is implemented on all significant operating systems. A coupleof vendors offer VISA libraries, partly with free download. These librarieswork together with arbitrary peripherical devices, although they may belimited to certain interface devices, such as the vendor’s GPIB card.
The VISA specification has explicit bindings to Visual Basic, C, and G(LabVIEW’s graphical language). Python can be used to call functions from aVISA shared library (.dll, .so, .dylib) allowing to directly leverage thestandard implementations. In addition, Python can be used to directly accessmost bus systems used by instruments which is why one can envision to implementthe VISA standard directly in Python (see the PyVISA-Py project for moredetails). PyVISA is both a Python wrapper for VISA shared libraries butcan also serve as a front-end for other VISA implementation such asPyVISA-Py.
- User guide
- Advanced topics
- FAQ
- API Documentation
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PyVISA is a Python package that enables you to control all kinds of measurement devices independently of the interface (e.g. GPIB, RS232, USB, Ethernet). As an example, reading self-identification from a Keithley Multimeter with GPIB number 12 is as easy as three lines of Python code. Pyserial for mac. Python 2.7.5, Mac OS 10.7.4, PyVISA 1.4, NI-VISA 5.4. If I understand correctly, the main reason that PyVISA throws lots of errors when imported on a 64-bit Mac is because PyVISA compiles as 32-bit, while Python will run by default as 64-bit. Works fine in Mountain Lion 10.8.5. Install NI-VISA Runtime 5.4. Install pyvisa; First make an i386 binary of Python (mac os built-in) to force Python into 32-bit mode. Pyvisa has an optional query parameter for list_resources(), which you can use to narrow the scope of your search to just your device.The syntax for this is like a regular expression.
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