VISA write error -1073807246 only when compiled

[squidmixer]

Hello,

I am having a strange problem communicating using the NI USB-485 converter.  When I run my vi,

everything communicates with my microcontroller just fine, but when the vi is compiled into

an .exe, I get the above error code (-1073807246) and no bytes sent out through the port.  I have tried

with both synchronous and asynchronous modes of communication and either one generates the same

error, but only in the built app.  I am running LV8.5 and have just installed the app builder.  I can pare down

and send the code and the compiled app if necessary.

Thanks,

Kevin

[pBerg]

Howdy squidmixer,

Error code -1073807246: The resource is valid, but VISA cannot currently access it typically indicates that the VISA port is in use by another application. You want to verify that no other programs are running that try to access the specified serial port before running your executable. Also, ensure that you end all of your VISA tasks using VISA Close, and this should fix the issue.

[squidmixer]

It seems a little inefficient, but now I'm initializing and closing the comport each time I set or query my hardware.  The error is gone.  Thanks.  Strange that it only appears when built into an executable and not when the vi itself is run.