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RS-232 is the electrical standard used on most serial ports. Note that this standard is a +/- 15 volt system and requires a FDMI converter to make it compatible with TTL logic levels.

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Reverse engineering old serial devices and cloning with Arduino

You can monitoring the data RS232/422/485 COM ports and also displays, logs and analyzes all serial port activity in a system by utility https://github.com/eltima-software/RS232-Data-Logger From my firsthand …
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