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Open / connection status

Hej.

 

I am new to C# but have made some GPIB Instrument control in C++ some 10 years ago so I am not a hardcore programmer.

 

My problem is that I want to open a connection to an instrument and then detect if it is there.

If it is not there then I want exit the function.

I have not been able to figure-out how to get the handle status back.

 

I have been looking for a handle that is “null” but found nothing.

And I have been looking for “exceptions” and made some “try and error” but without success.

 

Anyone that can help.

 

 

I am using the VisaNS.

 

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////

using NationalInstruments.VisaNS;

 

public void Get_IDN(int i)

   {

     string responseString;

          

     gSession = (GpibSession)ResourceManager.GetLocalManager().Open("GPIB0::20::INSTR");

 

     responseString = gSession.Query("*IDN?\n");

     gSession.ControlRen(RenMode.DeassertAfterGtl);

     gSession.Dispose();

    }

 

/Jan

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Look at the examples in C:\Users\Public\Public Documents\National Instruments\NI-VISA\Examples\DotNET4.0\

 

 

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Hej nyc thanks.

 

I have already been looking on these examples and that was what led me to look for exceptions. More precise I tried to catch "VisaException" but with no luck.

It never registrated any exception though no instrument was connected.

 

So am I searching in the wrong direction.

 

/Jan

 

 

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