Double_D
2008-08-06 19:40:08 UTC
I am having multiple communication issues using a GPIB-ENET/100 to talk to a Keithley 6487 and a 6517A using LabVIEW 8.6. I can communicate just fine from MAX, sending the *idn? or read? queries and getting data back. When using a simple program in LabVIEW, however, I encounter errors. When I call VISA Open, I sometimes get no error or I get warning code 1073676413 (Session opened successfully, but the device at the specified address is not responding). If I do a device clear after this, I get error -1073807265 (No listeners condition is detected (both NRFD and NDAC are deasserted) ). Alternatively, I have seen error -1073807264 after the device clear (The interface associated with the session is not currently the controller in charge). I had previously been using a Keithley KPCI-488 as the controller. I was able to get LabVIEW to work at times with this device, but results were inconsistent and performance was sluggish, so I switched to the GPIB-ENET. I uninstalled the Keithley software and deleted the KPCI-488 controller in MAX, hoping these steps would help, but they have not. I have attached the simple VI I am using for testing purposes.
Simple VISA Test.vi:
http://forums.ni.com/attachments/ni/170/347255/1/Simple VISA Test.vi
Simple VISA Test.vi:
http://forums.ni.com/attachments/ni/170/347255/1/Simple VISA Test.vi