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I/O error with COM port

I have a RS485 line going into COM5 of my PC. Using HyperTerminal, I can talk to my serial device. However, there are problems with LabVIEW VISA functions. I can open the connection. I/O errors were given when I try to read or write. Is this because LabVIEW does not support RS485? What can cause the I/O error? Thanks.
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Hello-

LabVIEW can communicate to RS-485. If HyperTerminal works, there shouldn't be a problem with LabVIEW. What kind of errors are occurring? Is it possible to attach an NI-Spy capture? An I/O error could have many causes. Be sure that no other process (like HyperTerminal) are accessing the serial port.

Randy Solomonson
Application Engineer
National Instruments
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