Hello,
I wanted you to check a couple of things. Under devices and interfaces in Measurement and Automation Explorer, when you highlight your GPIB device, right click on it and click on NI 488.2 troubleshooting wizard and check to see if either of the tests fail.
Also, make sure you have the latest driver versions for your device
Current GPIB driver versionsThere is also a knowledge base KB 1DREQIQA
GPIB Error codes and solutions which talks about all the error codes and it has EDVR error code explanation too.
Check to see if the solution seems apporpriate.
Incase you have any further questions, feel free
to email back.
Good luck and have a great day!
Thanks,
Koninika
National Instruments.