Although RS-232 connectors were once common on computers and peripheral devices, such as printers and modems, they have been phased out in most modern devices in favor of USB connectors. The standard also defines the physical size and pinout of connectors. The RS-232 standard defines the electrical characteristics, timing and meaning of signals. When using an RS‑232 connection, be sure to test it with a terminal program on a computer first. RS-232 is a standard for the serial communication of data between data terminal equipment (DTE), such as a computer, and data communication equipment (DCE), such as a computer modem, a room control system or a control port on electronic equipment.
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