Serial port is still open even after closing it explicitly

[ananda]

Hello,

I need to close a VI that is using a COM port and use the same port through some other program. But for some reason even after I stop the VI where I explicitly close the com port, I can not still use the hypterterminal to connect to the port. It says port is being used by some other program.  What can be the reason? Any thought ?

Thanks,

Ananda

[tst]

Is the VISA close the last action you perform on the VISA reference?
If not, then your port will probably be opened again, so make sure it's the last one.

Also, I seem to remember reading something about some bug where VISA close wouldn't properly close the port. I would suggest you try searching for it and also make sure you have an updated version of VISA.