It turns out that one of my meters is not accepting GPIB commands. It can return the display value, but no other commands are accepted.
I am about half way through porting my 3455A tool to the 3456A and needed to verify my understanding on some commands. After messing with configurations for a while with no commands accepted, I changed to the other meter and everything is working and most of my assumptions were good. Once the tool is complete, I will dig into the problem meter.
My first guess is that one of the GPIB buffer chips is dead, but will check the simpler stuff first.
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BobH
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