GPIB locks up after about 15 minutes with a VISA Write Timeout Error

I am using GPIB to control two electronic loads.  After about 15 minutes of runtime on the program, the GPIB communication locks up.  A probe reveals an error message about a Visa Write Timeout.  When this occurs, I have to stop the program, cycle the power on the two loads, and then restart the LabView program. When addressing the loads, I use the same routine every time.  1) Initialize communication, 2) Send command/request, 3) Close communication.  I thought I might have been overloading the GPIB bus, so that's when I added the close command after each sequence. However, it didn't seem to make a difference.  Could there be a compatability issue with the GPIB of the loads and the NI GPIB or Windows version? (I'm using XP and LV 10)  The electronic loads are older models, so I'm not sure how that impacts this scenario.

Hi kcarbon80, 
As this thread is over 2 years old, I do not know what solution was found for the previous problem being addressed, if any. However, if the device is locking up in the middle of your program, you may want to try clearing the device programmatically using the DevClear.vi that comes with the NI 488.2 driver. 
I hope this helps. 
Best Regards,
Thomas B.
National Instruments
Applications Engineer

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