Just like in the other direction (Stamp to PC), your VB program has to send data to the Stamp and the Stamp can receive it using the SERIN statement. Your VB program and your Stamp program have to cooperate. Often the Stamp drives the exchange with the Stamp essentially sending commands to the VB program asking it to send back specific information. Have a look at StampPlot Pro and PLX-DAQ from the Stamp Downloads webpage for examples.
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