Python VISA bindings for GPIB, RS232, and USB instruments
A PyVISA backend that implements a large part of the “Virtual Instrument Software Architecture” (VISA) in pure Python (with the help of some nice cross platform libraries python packages!).
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 backends. These backends can be dynamically loaded. PyVISA-py is one of such backends. It implements most of the methods for Message Based communication (Serial/USB/GPIB/Ethernet) using Python and some well developed, easy to deploy and cross platform libraries
VISA and Python
Python has a couple of features that make it very interesting for measurement controlling:
- Python is an easy-to-learn scripting language with short development cycles.
- It represents a high abstraction level, which perfectly blends with the abstraction level of measurement programs.
- It has a very rich set of native libraries, including numerical and plotting modules for data analysis and visualisation.
- A large set of books (in many languages) and on-line publications is available.
- Python (tested with 2.7, 3.4+)
- PyVISA 1.6+
Optionally - PySerial (to interface with Serial instruments) - PyUSB (to interface with USB instruments) - linux-gpib (to interface with gpib instruments, only on linux) - gpib-ctypes (to interface with GPIB instruments on Windows and Linux, warning: experimental)
Python 2 support
With Python 2 EOL behind us, and given the limited time maintainers have, the 0.4.0 release of PyVISA-py will be the last version of PyVISA-py supporting Python 2.
$ pip install pyvisa-py
The documentation can be read online at https://pyvisa-py.readthedocs.org
pyvisa-py is written and maintained by Hernan E. Grecco <email@example.com>.
Other contributors, listed alphabetically, are:
- Alex Forencich <firstname.lastname@example.org>
- Alexander Bessman <email@example.com>
- Colin Marquardt <firstname.lastname@example.org>
- Lance McCulley <email@example.com>
- Martin Ritter <firstname.lastname@example.org>
- Matthieu Dartiailh <email@example.com>
- Sebastian Held <firstname.lastname@example.org>
- Thomas Kopp <email@example.com>
- Thorsten Liebig <firstname.lastname@example.org>
- Tobias Müller <Tobias_Mueller@twam.info>
(If you think that your name belongs here, please let the maintainer know)
- fix typo in tcpip.py PR #233 (back-ported)
- support device lan name in TCPIP INSTR resources PR #226
- fix handling of VXI11 flags in device_write PR #226
- do not enforce 4 bytes padding RFC 1014 since some instrument do not respect it (Issue # 225) PR #226
- fix not setting stop bits with serial devices PR #205
- fix improper wait time before a timeout in the TCPIP backend PR # 173
- add GPIB support for proprietary device drivers on Windows and Linux (experimental): try importing gpib-ctypes if linux-gpib is not present. fix #105 #137
- fix return types of PyVisaLibrary and Session methods to match pyvisa.highlevel.VisaLibraryBase fix #169 PR #170
- avoid double closing of gpib resources PR #171
- fix initialization of timeout for the USB resources (the default was set before creating the underlying connection to which the timeout must be passed and was not). PR #167
- implement USBTMC abort sequence after read timeout to avoid losing communication with the instrument after a timeout occurs. PR #179
- fix custom timeout for USB instruments. PR #179
- fix triggering for all protocols. PR #180
- add support for “quirky” devices made by Rigol. PR #186 PR #207
- add support for Visa flush operation. PR #208
- fix reading large amounts of data from some instruments when using VXI-11. PR #209
- Fix initialization of timeout (issue identified in TCPIP resources) PR #160
- Fix handling of seesion registration under Python 3.7 PR #155
- Add read_stb, assert_trigger, lock, unlock to highlevel PR #139
- Fix timeout handling in usb PR #144
- Add gpib_command and assert_trigger to GPIB PR # 136
- Handle ValueError in usb list fix #131 PR #132
- Fix reading on GPIB and implement clear and gpib_send_ifc PR #132
- Do not error when listing USB devices PR #126
- Fix an error in the handling of the termchar for TCPIP INSTR PR #126
- Make list_resources return an empty tuple instead of erroring PR #121
- Proper support for timeout in TCPIP INSTR sessions PR #120 #127 #130 #144
- Proper encoding of data before transfer for all backends PR #119
- Unify use of StatusCode PR #118
- Improve handling of sessions attrs PR #116
- TCPIP SOCKET timeout handling improvement PR #115
- Fix compatibility with pyserial 3.0 PR #112
- TCPIP SOCKET handler read should not block PR #107
- TCPIP error handling fixes PR #100
- Use repr() instead of str() to log RPC record PR #97
- Speed up large transfer over GPIB 2beb52a5bcea2dae32d4a9908dc19f7874bfc0b7
- Catch GPIB errors while enumerating devices 9fea9d5c40cc6c33ce1244c209e5e576a33abfc2
- Add a serial poll function to GPIB backend PR #67
- Handle timeout in USB TMC backend PR #64
- Make USB TMC backend faster by transferring multiple bytes PR #63
- Fix issue with encoding before data transfer PR #59 #
- Get Linux GPIB version PR #55
- Fix broken import in TCPIP sessions PR #51
- Added support for TCPIP Socket. (Issue #38, thanks Thorsten Liebig)
- Added support for GPIB INSTR using linux-gpib. (Issue #24, thanks bessman)
- Added support for USB RAW. (Issue #18, kopp)
- Better error reporting when pyusb or pyserial is missing.
- Fixed logging of unicode strings. (Issue #54)
- Fixed timeout in SerialSession. (Issue #44)
- Moved resource name parsing to PyVISA.
- VXI11 protocol performance enhancement. (thanks alexforencich)
- Improved pyusb importing.
- Fixed large binary reads in TCPIP.
- Added backend information to logger.
- Use pyvisa compat/struct.py for python < 2.7.8 (thanks Martin Ritter)
- Initial release. Preliminary support for: - USB INSTR - TCPIP INSTR - ASRL INSTR
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