Why does visa write hang with Labview 2009 instrument drivers.

I'm having an issue with a code package that I'm running. The pacakge is very complex and was written by someone other than me. It runs fine while using the labview 8.5 drivers, however, when the 2009 instrument drivers are install there is a visa write call to an instrument where the software will hang up at the VISA write VI. I tried setting the timeout attribute but that makes no difference. I would expect that if the visa write did not work, that it would time out with an error instead of hanging up.
Some additional information. The instrument is an EPM which is on a GPIB bus with other instruments. When I place the EPM2000 on a serparate bus this problem goes away, but I want to be able to operate on the same GPIB bus.
Has anyone experienced a similar problem? What can I try to help troubleshoot the problem. I tried opening NI Spy but that shows no activity going on.

Hi Steve,
My apologies, when you said instrument drivers I assumed you were refering to the individual drivers for your instrument. Were you refering to the VISA drivers? If so, the latest version of these is 5.1.1 which can be downloaded here: http://joule.ni.com/nidu/cds/view/p/id/2659/lang/en.
Also are you able to communicate with this device using the test panels in Measurement & Automation Explorer? There is also a tool called NI IO Trace (or it may still be called NI-SPY in 2009) that can be opened from MAX that monitors all GPIB commands sent and received on the machine. Getting a log of the commands when the hang occurs may help to diagnose it.
It is possible this issue could be caused by opening and closing the VISA reference frequently in the code such as in a loop iteration. Is this is case in your code?
Justin D
Applications Engineer
National Instruments
http://www.ni.com/support/

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