I can't run visa interactive control window. ERROR MESSAGE: "Unable to open session "ASrl::INSTR" Status name VI_ERROR-RSRC BUSY Visa cannot curently access this resource.

[gstt gita]

I cant run tds220 (driver for oscilloscope).
Error message:
VISA: (Hex 0xBFFF000E) The given session or object reference is invalid.

Furthermore
I cant run Visa INteractive control.
Error message:
"Unable to open session to "ASRL1::INSTR" Return value 0xBFFF0072 Status name VI-ERROE-RSRC-BUSY . VISA csnnot currently access this resource."

Then change ports, this message appears for another port.

Thanks for answer.
Gita

[shoneill]

Try shutting down LabVIEW completely, and then running the VISA Interactive Control.

Maybe you still have a port open somewhere. LabVIEW often only releases the ports after exiting LabVIEW, not just after closing the VI which had opened the port.

Shane

[Ray K]

The port is open by another resource. You note that you should also get an error if you try to access the port in hyperterminal. Try rebooting your computer and the first thing you try is opening a VISA session with Visa Interactive control(VISAIC).

• If that fails, then you have a driver accessing your ports.
  
• If it works then it was just two applications that were trying to access your port (LabVIEW and VISAIC are seperate apps even thought they both may be using VISA.)
  

Closing VISA sessions:

• LabVIEW will only *automatically* close VISA sessions if you have this option set: Tools>>options>>Automatically close VISA sessions.
  
• Otherwise you need to explicitly call a Visa close on the resource.