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it is the simplest (and cheepest) way of adding communication between a PC and any microcontroller equipped with a UART.
I have to agree with dunk. RS-232 is still a major protocol. Many motor controllers, sensors, etc.. that you can buy off the shelf require RS-232.
Some of us will forever love (except soldering DB-9 connections for) RS-232.
QuoteSome of us will forever love (except soldering DB-9 connections for) RS-232.This is one major reason why I want to swap to USB