VISA viOpen strangeness and linking them to an Agilent N6700B Power Supply (GPIB and C/C++)

I noticed a strange behavior with connection to a power supply Agilent by GPIB, but if all goes well, just something miss me.

If I power on and connected via GPIB to a card PCI of National Instruments and launch my app, viOpen gives me VI_SUCCESS and I can handle the desired power (voltage, power on/off, etc. exit exit evolution). However, if I run the application with the power supply off the power (output not only people with disabilities, but completely off) then viOpen gives me no error found resources, as it should because the instrument can not be detected. My request is scheduled to retry the connection every 10 seconds, and also long the power is turned on, it does as expected. The strangeness is when I turn the power supply on when the application tries to reconnect. Even if the power is connected, viOpen still gives a failure condition. In addition, using the Agilent IO connection Expert software, it lists the instrument in an error state. It becomes strange when I open MAX and click on "Contact Instrument." Simply by clicking on this option restores the instrument being error-free and call viOpen to my app works perfectly. Is there something that MAX is to initialize the instrument when you want to communicate with it? If so, is there a way to recreate it using software VISA controls? For reference, here is the code that I use to connect to the instrument (and subsequently tries to reconnect if the connection fails). Thanks for any help in advance.

In a header file:

ViSession session, defrm;

ViStatus VISAstatus;

In a file:Code .c is performed every 10 seconds

strcpy (IOaddress, "GPIB0::5");

VISAstatus = viOpenDefaultRM (&defrm);)

VISAstatus = viOpen (defrm, IOaddress, VI_NULL, VI_NULL, & session);

If (VISAstatus! = VI_SUCCESS)
{
viStatusDesc (session, VISAstatus, statdsc);
Print an error message

return;
}

Else if (VISAstatus == VI_SUCCESS)

{

viStatusDesc (session, VISAstatus, statdsc);

Print the success message

initializeStuff();

}

Seems I spoke too soon, I just fixed the problem.

The Agilent VISA library was used as the main VISA library. I completely uninstalled the Agilent IOSuite (including his VISA) software and uninstalled the VISA National Instruments as well. I then reinstalled the IOSuite and allowed the most recent NI-VISA for overwriting. The first time I ran my application after I did this, it worked perfectly.

Tags: NI Hardware

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