IVI .NET ResourceManager Find Method response incomplete?

[lmart]

Hello,

I am trying to use the IVI .NET VISA SW components to interface my Instruments with MATLAB.

Using NI VISA Interface Control SW (and clicking "refresh"), I am able to list and see all the interfaces.

And the NI IO Trace acquisition shows 8 interfaces :

I am interested in the last one in the traces: the instrument on GPIB...

Now, I am using the IVI .NET VISA SW component.

Running the Find() method of the GlobalResourceManager class, the result is different !

The number of detected interfaces is reduced to 6 instead of 8?

I have lost the GPIB ones, unfortunately.

I am using : Ivi.Visa.GlobalResourceManager.Find('?*') or Ivi.Visa.GlobalResourceManager.Find() - with same result.

And when running this line, the NI IO trace shows:

Only serial interface are listed here and no longer GPIB ones.

What is the difference between what is done by the NI VISA interactive control SW and the ResourceManager.Find() method I am trying to use?

Shall I do something different, what am I doing wrong?

Thank you in advance for your help and advice.

Best regards,

Laurent

[Cdkey]

Hi lmart,

What version of NI-VISA and NI-488.2 did you install on your computer?

Did you try to open a connection to the GPIB instrument by using the name displayed in NI-MAX?

Did you try to research specifically the GPIB using this expression: GPIB?*INSTR ?

Regards,

Clement

[lmart]

Hi Clement,

I have installed the latest versions : NI-488.2 20.0 / NI-VISA 20.0 and NI-ICP 20.0

I should be up to date regarding NI drivers and NI SW components.

Using NI-MAX, I am able to detect my instrument on GPIB::4::INSTR, then I am able to open a VISA connection and send + receive commands => with NI-MAX and NI VISA Interactive Control SW everything works quite fine.

But using .NET interface with MATLAB, when trying to open a connection to the same GPIB address = 'GPIB::4::INSTR' as mentioned in NI-MAX, I encounter an error. The IVI .NET Open() call did not succeed => VISA Error 0xBFFF00A5 (VI_ERROR_INTF_NUM_NCONFIG) returned as error.

I opened a dedicated thread on this error too => https://forums.ni.com/t5/Instrument-Control-GPIB-Serial/VISA-Error-0xBFFF00A5-VI-ERROR-INTF-NUM-NCON...

I also tried many .NET Find() calls with numerous query strings ('?*', 'GPIB?*INSTR', ...) but here again, no success.

It is like .NET interface is filtering in some way the USB-GPIB adapter ???

Many thanks for your help.

I am still trying to understand the issue, because everything is OK with NI tools 😞

Regards,

Laurent