visa.resourcemanager('@py') show no instruments

Asked May 22 '19 at 12:59

Active Jun 25 '19 at 11:35

Viewed 1,370 times

I have a hardware setup where several instruments are connected to the control computer. The pyvisa default back-end, a C implementation provided by National Instruments, found all the instruments, while the pyvisa-py pure-Python implementation did not find any.

I'm using the latest versions of pyvisa and pyvisa-py. I used the following code to search for instruments, using both back-ends.

import visa
rm_py = visa.ResourceManager('@py')
rm_ni = visa.ResourceManager()
rm_py.list_resources()
rm_ni.list_resources()

With rm_py.list_resources(), I got (), meaning no device detected.

With rm_ni.list_resources() on the other hand, I got:

'('TCPIP0::169.254.172.70::INSTR',
'TCPIP0::192.168.3.10::inst0::INSTR',
'ASRL3::INSTR',
'GPIB0::28::INSTR',
'TCPIP0::AWG70K-38293801::inst0::INSTR')'

edited Jun 25 '19 at 11:35

asked May 22 '19 at 12:59

Echt-Drei-sonne-person

Just out of curiosity, Win or Linux? – mikuszefski Jun 25 '19 at 11:48
please don't say Mac, now. – mikuszefski Jun 25 '19 at 11:48
The OS is Win10. – Echt-Drei-sonne-person Jul 02 '19 at 09:21
I have the same problem on Linux – Erik Iverson Jan 30 '21 at 22:51
For Linux have a look at [this](https://stackoverflow.com/a/66480539/8849755). – user171780 Dec 22 '21 at 10:31
@user171780 could you try visa.ResourceManager('@py')? This script uses the pyvisa-py backend. If you have IVI libraries from NIvisa, Tekvisa,etc, visa.ResourceManager() usually autmatically leads to this IVIs instead of pure python backend. – Echt-Drei-sonne-person Dec 27 '21 at 08:46

visa.resourcemanager('@py') show no instruments

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