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Instrument Control (GPIB, Serial, VISA, IVI)

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Two NI GPIB-USB-HS Can't Talk to Each Other

I have 3 instruments, 2 with NI GPIB-USB-HS adapters and 1 without. Both systems with adapters can see the 3rd instrument, but they can't see each other. I tried different boot orders, and several reboots and can't get them to see each other. The controller is 1 of the instruments with an adapter and is device #0. The other instrument using an adpater is not the controller and is device #28. Any ideas why the instruments connected using adpaters can't talk to each other?

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