For home use, RS232 has been obsolete for some time, superseded by the more-versatile USB standard. Not only that, but it found a home in industrial applications, for connecting manufacturing and tooling machines. As PCs became mainstream, it became a favored standard for connecting all kinds of peripherals. RS232 was first used in the 1960s for accepting computer inputs from electromechanical keyboards. One of the oldest – and most enduring – serial connections is RS232. As a result, there’s a healthy market for adapters, hubs, and other devices to aid in connectivity. There have been a number of standards throughout there years, used for all different kinds of purposes. Not only that, but USB is only one kind of serial connection. And within those, there are various standards, such as USB 2.0, 3.0, and 3.1. There’s standard USB (Type-A), there’s Type-B, Type-C, Micro USB, and even Mini USB. USB is an excellent example the “U” literally stands for “universal,” but it’s far from universal. Over time, few things about computers have remained less consistent than wiring standards.

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