The Recommended Standard 232 (RS-232, today known as EIA-232-gateway) was formally introduced by the Electronic Industries Association (EIA) in 1969. At that time, text-terminals and mainframes used to be connected point to point via telephone circuit by using a modem. EIA-232 defines the connection between the terminal (DTE data terminal Equipment) and the modem (DCE data communication Equipment) concerning timing, level of voltage, protocol and plug.
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