This happens rather infreqenctly. But every now and then, SendIFC and ibfind will return a EDVR(0) code. I can recover by unplugging and replugging the usb and it will work again. I am using GPIB-USB-HS, driver rev 2.4. I did not notice this problem when GPIB-USB-B was used. Also, once this happens, the NI-488.2 troubleshooting wizard also is reporting an error when run.Here is an NI spy output fragment:> 32660. SendIFC(0)> Process ID: 0x00000F10 Thread ID: 0x00000DE8> Start Time: 14:03:29.892 Call Duration: 00:00:00.047> ibsta: 0x8000 iberr: 0 ibcntl: -534904741(0xe01e005b)> 32661. ibfind(GPIB0)> Process ID: 0x00000F10 Thread ID: 0x00000DE8> Start Time: 14:03:29.892 Call Duration: 00:00:00.047> ibsta: 0x8000 iberr: 0 ibcntl: -534904741(0xe01e005b)> 32662. ThreadIbsta()> Process ID: 0x00000F10 Thread ID: 0x00000DE8> Start Time: 14:03:29.939 Call Duration: 00:00:00.000> ibsta: 0x8000 iberr: 0 ibcntl: -534904741(0xe01e005b)> 32663. ThreadIbsta()> Process ID: 0x00000F10 Thread ID: 0x00000DE8> Start Time: 14:03:29.939 Call Duration: 00:00:00.000> ibsta: 0x8000 iberr: 0 ibcntl: -534904741(0xe01e005b)> 32664. ibonl(0, 0)> Process ID: 0x00000F10 Thread ID: 0x00000DE8Also, I brought up the Event Viewer and it was saying that there is a warning from the plug&play manager at round 14:02pm. I do not know if the EDVR error and this warning are related, even though the time stamp are close to each other.For that is worth, the content of the event properties read:Source : PlugPlayManagerType : WarningEventID : 256Description : Timed out sending notification of device interface change to window.

Instrument Control (GPIB, Serial, VISA, IVI)

get EDVR(0) error every now and then

I believe the problem stemmed from the TEK-USB-488 adapter I was using, as no similar problems have persisted with the GPIB-USB-HS controller.
We are using LabView 8.2.1, and I'll try to look up what else is pertininent (eg drivers).

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Instrument Control (GPIB, Serial, VISA, IVI)

get EDVR(0) error every now and then

Re: get EDVR(0) error every now and then