rs232 - How can I use a serial port to listen to if a toggle is switched? - Electrical Engineering Stack Exchange
All you have to learn about serial connector pinouts
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What is RS232 Serial Communication Protocol and How it Works?
Serial Cable - DB25-M to DB9-F; 6 foot length
What is RS232 Serial Communication Protocol and How it Works?
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RS232 Pin Out – Cable Tester
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