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  1. RS-232 - Wikipedia

  2. Fundamentals of RS-232 Serial Communications - Analog Devices

  3. What is RS232 Protocol and How it Works? - Codrey Electronics

  4. Understanding the RS-232 Standard - Digi-Key Electronics

  5. RS232 Serial Communication Protocol: Basics, Working

  6. Fundamentals of RS232 Communication Protocol: Working …

  7. What is RS-232? Fundamentals of the Protocol - Advantech

  8. RS-232 Features Explained | Analog Devices

  9. RS232 Protocol: Introduction To The Standard And The Interface.

  10. RS-232: Serial Interface - NETWORK ENCYCLOPEDIA