ISO232 - Optically isolated USB to RS232 interface
Submitted by GG on Tue, 03/16/2021 - 16:35RS232 are still very popular to control legacy equipment. In industrial settings with long cable runs, interference and different ground references it is necessary to have galvanic isolation. ISO232 is a simple implementation using the FTDI FT230X and opto isolators that can reach speeds up to 115200baud.
Schematics
The schematics is divided in four main portions.