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Simplex communication is a communication channel that sends information in one direction only. 〔 IEEE Std. 100 "Dictionary of Standards Terms", "Simplex" p.1053 〕 A "duplex" communication channel requires two simplex channels operating in opposite directions. The ITU definition of simplex is a communications channel that operates in one direction ''at a time'', but that may be reversible; this is termed "half duplex" in other contexts. For example, in TV and radio broadcasting, information flows only from the transmitter site to multiple receivers. An RS 232 interface between a computer terminal and a modem is made up of multiple simplex control and data circuits, but information can flow both ways since channels are provided both to and from the terminal. A pair of walkie-talkie two-way radios provide a simplex circuit in the ITU sense; only one party at a time can talk, while the other listens until it can hear an opportunity to transmit. The transmission medium (the radio signal over the air) can carry information in both directions, but the apparatus only allows one direction at a time to be used. ==Examples== * Commercial radio and television broadcast (not two-way radio such as walkie-talkies) * Garage door openers * Baby monitors * Wireless microphones * Radio controlled models * Public address systems * Surveillance cameras * Pagers * Communication between a mouse and a computer * Internet multicast * Radio navigation beacons and radiolocation services such as GPS * Telemetry * printers 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Simplex communication」の詳細全文を読む スポンサード リンク
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