MacOS 12.7 w/ NI 488.2 Driver and GPIB?

[pac1085]

Hi, I'm attempting to use pyvisa-py with gpib on my macOS 12.7 machine (NI GPIB-USB-HS). I've installed NI 488.2 driver, and confirmed it's working thru the NI GPIB explorer, troubleshooter, etc.

I see the documentation for pyvisa-py it says "On MacOSX, you should install the NI-488 library from National instrument."

When I run pyvisa-info this is what it says. How do I get it to detect the NI 488.2 driver that's installed on the system? Thanks!

➜ bin ./pyvisa-info Machine Details: Platform ID: macOS-12.7-x86_64-i386-64bit Processor: i386

Python: Implementation: CPython Executable: /Library/Developer/CommandLineTools/usr/bin/python3 Version: 3.9.6 Compiler: Clang 14.0.0 (clang-1400.0.29.202) Bits: 64bit Build: Oct 18 2022 12:41:40 (#default) Unicode: UCS4

PyVISA Version: 1.13.0

Backends: ivi: Version: 1.13.0 (bundled with PyVISA) Binary library: Not found py: Version: 0.7.0 TCPIP INSTR: Available Resource discovery:

• VXI-11: partial (psutil not installed)
• hislip: disabled (zeroconf not installed) TCPIP SOCKET: Available ASRL INSTR: Please install PySerial (>=3.0) to use this resource type. No module named 'serial' USB INSTR: Please install PyUSB to use this resource type. No module named 'usb' USB RAW: Please install PyUSB to use this resource type. No module named 'usb' VICP INSTR: Please install PyVICP to use this resource type. GPIB INSTR: Please install linux-gpib (Linux) or gpib-ctypes (Windows, Linux) to use this resource type. Note that installing gpib-ctypes will give you access to a broader range of functionalities. No module named 'gpib' GPIB INTFC: Please install linux-gpib (Linux) or gpib-ctypes (Windows, Linux) to use this resource type. Note that installing gpib-ctypes will give you access to a broader range of functionalities. No module named 'gpib'

[MatthieuDartiailh]

As hinted by the message you get you need to install gpib-ctypes. It does not mention MacOs but it should.

[pac1085]

Thanks for the reply. I did notice that and installed gpib-ctypes. Unfortunately it states that it cannot find the library, and when I try to load it manually with _load_lib, it throws an error. Perhaps I need to open an issue with the gpib-ctypes GitHub, however I figured I'd start here since the docs for pyvisa-py specifically mentioned MacOs with NI 488, and I can't find any mention of it on the gpib-ctypes project page; they only mention Windows and Linux.

Python 3.9.6 (default, Oct 18 2022, 12:41:40) [Clang 14.0.0 (clang-1400.0.29.202)] on darwin Type "help", "copyright", "credits" or "license" for more information.

import gpib_ctypes /Users/philip/Library/Python/3.9/lib/python/site-packages/gpib_ctypes/gpib/gpib.py:54: UserWarning: GPIB library not found. Please manually load it using _load_lib(filename). All GPIB functions will raise OSError until the library is manually loaded. warnings.warn(message) import pyvisa

gpib_ctypes.gpib.gpib._load_lib('/Library/Frameworks/NI4882.framework/NI4882') Traceback (most recent call last): File "", line 1, in File "/Users/philipchapman/Library/Python/3.9/lib/python/site-packages/gpib_ctypes/gpib/gpib.py", line 91, in _load_lib libfunction = _lib[name] File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/lib/python3.9/ctypes/init.py", line 384, in getitem func = self._FuncPtr((name_or_ordinal, self)) AttributeError: dlsym(0x2170abf40, ibsre): symbol not found

[berzoll]

hey there. I am having exactly the same issue.

Did you figure out a solution to this? The resources are listed correctly, but when I try loading some Keithley modules I get this error:

ValueError: gpib_ctypes is installed but could not locate the gpib library. Please manually load it using: gpib_ctypes.gpib.gpib._load_lib(filename) before importing pyvisa.

I cannot figure out any path that seems to be working as a valid library for gpib_ctypes.