The RS-232 (Recommended Standard 232) is a standard for serial binary data signals. this page provides information about introduction to RS-232 specifications, bit streams, physical properties, and error detection, RS-232 serial connector scope of standard, history, limitations, role in modern personal computers, voltage level, connectors, pinouts, signals and cables, RTS/CTS handshaking, 3-wire and 5-wire RS-232.