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IEBus (''Inter Equipment Bus'') is a two-wire vehicle bus used in the automotive industry as a communications bus between various devices (usually multimedia devices) by using half-duplex asynchronous (multi-master) communication with CSMA/CD (Carrier Sense Multiple Access/Collision Detection) for access control. It allows for up to fifty units on the bus over a maximum length of 50 meters. Two differential lines are used; Data+ / Data-, often labeled as Bus(+) Bus(-). ''IEBus'' and ''Inter Equipment Bus'' are NEC Electronics Corporation trademarks.〔http://www.am.necel.com/legal/trademark.html〕 == Protocol == A master talks to a slave. Each unit has a master and a slave address register. Only one device can talk on the bus at any given time. There is a pecking order for the types of communications which will take precedence over another. Each communication from master to slave must be replied to by the slave going back to the master with an ACK (acknowledge) bit. If the master does not receive the ACK within a predetermined time allowance it drops the communication and returns to its standby (listen) mode. * Mode 0 * * ''Uses 16 bytes/frame and runs at 3.9 kbit/s or 4.1 kbit/s.'' * Mode 1 * * ''Uses 32 bytes/frame and runs at 17 kbit/s (MHz Osc. ) or 18 kbit/s (MHz Osc. )'' 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「IEBus」の詳細全文を読む スポンサード リンク
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