>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.

Try 256000 and see if it will communicate.