Listening to serial port on Delphi 7?

http://sourceforge.net/projects/tpapro is a freeware tool we've used with great success for many years.

The already suggested tpapro will probably also do it, but I myself use TComport, which I consider slightly easier to use. It will has an event property onrxchar that triggers whenever a character arrives (and several options for other kinds of packets, including ASCII linediscipline).

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