What is a balun? It’s a device to convert an electrical signal from balanced differential signaling pairs to coaxial style signaling or vice versa. Oh, wow, that sounds really great. So, you could use one of those devices if you wanted to convert from RS-422 to RS-232, or maybe even if you wanted to route Ethernet over coaxial, with the help of some additional circuits. Indeed, the balun is worth more investigation on my side.
20181110/https://en.wikipedia.org/wiki/Balun