I have a PXIe-8840 connected to two SRS-630 at address 7 and 8 via the GPIB connector. When I run the "Scan for Instrument" out of MAX I don't see the instruments.
I have tried using my laptop and a GPIB-USB-HS+ and connect to the same instrument and it works fine. I have tried replacing all the cables. I have also tried just connecting to one instrument.
I have attached an NI-SPY trace capture.