RS-232 Recommended Standard 232, is a standard introduced in 1960 for serial communication transmission of data.

RS-232 formally defines the signals connecting between a Data Terminal Equipment (DTE) and a Data Circuit-terminating Equipment (DCE).

RS-232 defines the electrical characteristics and timing of signals, the meaning of signals, and the physical size and pinout of connectors. The current version of the standard is TIA-232-F Interface Between Data Terminal Equipment and Data Circuit-terminating Equipment Employing Serial Binary Data Interchange, issued in 1997.

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There might be more information for this subject on one of the following:
  • [#1] - RS-232 - based on information obtained 2018-09-04-