Serial communication using USB to Serial Converter

[wond3rboy]

Hi, i am using the PL-2303 USB to Serial(RS-232) Converter for serial communication using LabVIEW. 

http://www.prolific.com.tw/eng/products.asp?id=59

The driver installs properly and is accepted as a COM port my MAX, but the problem is that although it does pass all the tests that are in MAX, when i try it out with the example Basic 2 Port Serial Write and Read. VI, it gives the error. " The resource is valid but VISA can not currently access it". Can anybody tell me why do i get this error?

[smercurio_fc]

That's usually indicative of the serial port being open by another application. Or, you could have an open VISA session.