accessing same com port in labview

[Gops]

Hi,

I have a requirement where I have buit a serila port application with the visa driver. I have a third party DLL which access the same serial device through the same port I intend to use in my application. I tried to do some read write actions using my serial driver, then close the ports. Then I call the DLL in labview and send some more commands.

Here the DLL returns the error port cannot be opened. But when I exit labview and open a VI only with the DLL and try to send some commands, it is working fine.

Is it possible to build an application like what I have suggessted? Is labview not releasing the port completely after the call to close? Is there any alternative to do this process/

Regards

Gopal

[tbd]

Hi Gopal,

      With VISA it's easy to "accidentally" reopen a VISA connection, for instance, after explicitly Closing, a subsequent VISA Read will reopen the connection - even though no VISA Open is used.   Regardless, if you can post your VI it might help to identify the problem.

Cheers.