Instrument Control (GPIB, Serial, VISA, IVI)

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Several instruments on GPIB

Two instruments are connected to the GPIB.
These two are recognized by MAX and respond to the query *IDN?
I drive one of them with a software different of Labview although I drive the second one with Labview (my vi saves one measure every 10 seconds).
First, the test runs. But, after twenty minuts the vi cannot read the measure of the second instrument( a HP34401 multimeter). Then if I click on the button "Continue", the vi works for twenty minuts.

I don't understand why there is a bug when I use two instruments.

Can I have your advice ?

Now, I use the serial port of the computer to communicate with the multimeter and the test runs.
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What exactly is the error message that LabVIEW returns? Have you tried taking a spy capture of your system that catches the error? If so, could you post the file? What versions of LabVIEW and NI-488.2 are you using?
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