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We appreciate your patience as we improve our online experience.
09-24-2018 04:17 PM
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.
Solved! Go to Solution.
09-25-2018 02:29 AM
Did you try matching the GPIB port settings on NI MAX for both the inbuilt GPIB and USB GPIB methods?
What happens when you try to communicate with a particular instrument address by manually keying in the address though not automatically detected?
09-25-2018 08:20 AM
I get a timeout error when I manually try to talk to the instrument. I have a second PXIe-8840 configured the same way as the original one and it works fine.
09-25-2018 08:47 AM - edited 09-25-2018 08:47 AM
It is not uncommon for the GPIB cards inside some of the older instruments to have problems or the GPIB cables to have a break in a wire. If at any step the wrong response is seen, continue through all steps to determine if there is more than a single issue.
GPIB card seating and wire breaks can be intermittent or dependent on how they are connected.
09-25-2018 09:42 AM
It appears to be an instrument issue. The SR630 locks the GPIB bus and doesn't release it until you power it off. I will get with the instrument vendor.