keithley usb-gpib problems

[DECT&Bluetooth]

Hi
I have installed a Keithley USB-GPIB switch (CE 488) and suddenly my executable does not run properly, gets stuck and throws data that is not true.

The NI-MAX shows an unknown VISA entity.

If I am using VISA/GPIB write/read sub.vi in my program will it influence the proper running of my executable?

[craigherdman]

DECT&Bluetooth,

Perhaps someone in the community has experience with this but from my knowledge this isn't something directly supported by National Instruments. Is the CE 488 the Capital Equipment driver? Pretty much all the info that I have can be found here:

Using a Keithley PC488 GPIB Interface with LabVIEW [link removed; article no longer available]

Hope that helps!

Craig H.

[Dennis_Knutson]

I'm a little confused. I could not find any reference to a CE 488 on Keithley's web site. Is the Keithley device a switch or GPIB controller? If this is a controller, did you replace an NI board with this or did you add this to a system and now you have two controllers? If the Keithley device is a switch that can be controlled by either USB or GPIB, are you sure there's no address conflicts between it and your existing GPIB instruments?

[AnalogKid2DigitalMan]

If it is a switch, I'm thinking it may not respond to the IDN? command?
Thus Ni-Max may not be able to identify it. Have you read all the literature on it?

[Y3G]

Hi (my prior name was Dect&Bluetooth),
I have run on third party connectivity software (Intuilink from Agilent and CMD2Go from Rohde&Schwarz) on the Keithley Usb-Switch and it worked.
My program still makes problems as described before, maybe due to the fact that I am using a NI VISA READ/WRITE in some cases?
I have added a Spy file to show you the fails, I have changed the suffix to txt, you have to change it back to .spy in order to be able to read it.

Does it mean that I cannot use SCPI commands with NI VISA in order to use this adptor?
Thanks for any help.
Yariv

[Dennis_Knutson]

Even though you call it a USB-Switch, it would seem that you're using a USB-GPIB CONTROLLER. Does Keithley offer it's own version of VISA that you installed? If you have, then in MAX you could try turning on the Tulip Passport(Tools>NI-VISA>VISA Options). The other thing you can try is changind all of your VISA Reads and Writes to do I/O Synchronouusly by right clicking on the functions. It's possible that the Keithley controller or it's version of VISA doesn't support asynch reads and writes. I would also recomend that you contact Keithley to see how they recomend you use it with LabVIEW and NI-VISA.

Message Edited by Dennis Knutson on 04-14-2005 11:50 AM