>Several years ago I wrote an application that used MSCOMM to retrieve data from a GPS device at 9600 baud.
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>The device has been upgraded and now uses 230400 baud but I when I try to set MSCOMM to 230400 I get an error "invalid property value." Is it possible to set MSCOMM to accept 230400? If so how do I do it?
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>Thanks in advance for any suggestions.

Can you communicate with device with another program (e.g. Hyerpterminal) ? (this is of course assuming that the command protocol would allow you to be able to type something from keyboard and get a response)