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EBUS (serial buses)
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EBUS (serial buses) : ウィキペディア英語版
EBUS (serial buses)

In building automation, eBUS (energy bus) is a 2-wire digital serial data-bus communication interface used in heating and solar energy appliances, by mainly German manufacturers. It was originally proposed by the Karl Dungs company, and has since been adopted by several other manufacturers. The eBUS interface has also been used by home-automation enthusiasts to connect their domestic solar or heating system to a networked PC for monitoring or remote control.
== Physical layer ==

The eBUS 2-wire interface is an asynchronous serial port with active-low voltage that exchanges 8-bit bytes with start and (single) stop bits (no parity bit), at a symbol rate of 2400 baud, and can be implemented with a standard UART plus a voltage converter. It differs from the RS-232 interface, from which it is derived, in that the voltage levels were chosen to allow the bus also to supply power to bus participants, who can use a voltage stabilizer to derive an internal 5 V supply:
* logical 0 = 9–12 volt
* logical 1 = 15–24 volt (typical: 20 V)

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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