Tildesign has tackled the problem and developed an RS232 to TTL converter. The level shifter contains a two channel RS232 converter which works on both 3V and 5V power suppplies. The board, which is ...

Read, enjoy, and discover… RS-422 is an advanced version of RS-232 (https://en.wikipedia.org ... The most common, cheap, and widely known module available for this application is the “MAX490 RS422-TTL ...

which is a lot easier than messing about with TTL to RS-232 converters. It’s all built around an FTDI FT4232H chip, which has drivers available for most OSes, so it should work with pretty much ...