That interface doesn’t have to be special, and [Dakhnod] is here to show us that it can be done with an ESP32 microcontroller through its USB interface. The linked repository doesn’t tell us ...

There’s still plenty of useful hardware out there that uses an RS-232 interface, like the Behringer ... Inside the SerialChiller is an ESP32, a MAX3232 line driver, a LM1117 linear regulator ...