The simplicity of the RS232 interface makes it widely used in a variety of applications including industrial control, barcode scanners, and GPS receivers.
RS232 is an asynchronous protocol, meaning that it does not require a clock signal to synchronize data transfer. The receiving line is used to receive data from the TX line. Data is transmitted serially, meaning that each bit is sent one after the other on the TX line. The protocol uses a simple three-wire interface consisting of a transmit (TX) line, a receive (RX) line, and a ground (GND) line. RS232 is a standard for serial data communications between computers and other devices.
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