There are two stages, one which converts RS-232 to TTL, and the other converts TTL to USB. [André] removed the RS-232 chip and patched his own board (shown on the left) into its TTL lines.

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 ...

Although the communications world is dominated by USB and WiFi, many products still use RS232. While embedded controllers often feature one or more RS232 ports, they usually require signals with ttl ...