You are right, but it's possible to connect RS-422 to RS-232 using just proper wiring [1]. Basically, same three wires and one loop wire for RX+ to ground. It's

You are right, but it's possible to connect RS-422 to RS-232 using just proper wiring [1]. Basically, same three wires and one loop wire for RX+ to ground. It's not reliable and not recommended, but works and would solve the problem. :-) 1. https://stratusengineering.com/rs232-rs422485-conversion-cable-connection-requires-no-external-electronics-power/ https://stratusengineering.com/rs232-rs422485-conversion-cab...