electronic specification for serial data connections between digital terminal equipment (DTE) and data communications equipment. (DCE) Signal is unbalanced. May be either synchronous or asynchronous. Can reside on multiple connector sizes, but most commonly appear on DB9/ DB25 connectors. 50' transmission limit.
(1) EIA standard for single-ended signalling of binary data, (2) EIA standard for interpreting a bit stream as bytes, (3) EIA standard for communication of data and status between two devices using a group of RS-232 signals, and (4) EIA standard for the physical connectors used for RS-232 communication cables. The RS-232 connection between a computer and modem, or between a computer and an RS-232 controlled camera, involves all of the above specifications.
RS-232 interface specification defines the number of wires that are used to connect a modem ("DCE") to a computer or terminal ("DTE"), the electrical signals that are sent along these wires, and the signal levels that are used. Frequently, the RS-232 interface is used to connect a terminal to a computer without intervening modem equipment. RS-485 and RS-422 are similar interfaces for interconnecting DTE devices.