I have a power supply connected to my PC over GPIB using VISA. Everything seems to work fine, but when I turn off the power supply, and then try a query, VISA seems to just hang for around 30 seconds. I would expect it to timeout after only a few seconds (or whatever the timeout is set to, which is much less than 30s), but it does not. After this first query, it will timeout in a normal fashion, but the first query after powering off the instrument always takes forever. Nothing else can be sent over GPIB in the mean time. Any idea what might be causing this?
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