When I plug in my Tektronix DMM4050 I see that is gets assigned a com port in Device Manager but no ASRL ID.
It doesn't show up under USB Test and Measurement devices either.
I use Tekvisa and also have NI tools installed. All my other equipment works fine, the main difference is that the working instruments use USB cables and the DMM4050 has a db9 to usb cable.
What it looks like is ASRL is somehow disabled.
Does anyone have any ideas?