In this article, we will investigate how various Contest programs (Win-Test, N1MM, and CW-Skimmer) communicate with the FT1000MP shortwave transceiver over the serial port. We will see what happens when multiple programs try to talk to the transceiver at the same time, what problems appear and how we can successfully monitor and debug them.

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Tobias Wellnitz, DH1TW

Software Engineer