Communications: electrical – Continuously variable indicating – With supply voltage regulation or compensation
Patent
1992-05-29
1995-09-05
Swarthout, Brent
Communications: electrical
Continuously variable indicating
With supply voltage regulation or compensation
34031001, 34031006, 340509, H04M 1104
Patent
active
054482313
ABSTRACT:
The present invention provides a method and apparatus for transmitting signals on a transmission line, the transmission line having a DC current flowing therethrough and having a plurality of terminals connected thereto in a multidrop fashion. Each of the terminals is capable of drawing a portion of the DC current. A signal is transmitted on the transmission line by varying the portions of the DC current drawn by the terminals. When the signal is not being transmitted the total amount of the DC current drawn by the terminals from the transmission line is maintained at a value smaller than an average amount of the DC current drawn by the terminals from the transmission line when the signal is being transmitted.
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"Guidelines for Physical Layer Testing Low Speed, Voltage Mode"; distributed by the International Fieldbus Consortium and dated Apr. 18, 1991.
Asanuma Kenji
Mine Hironori
Takezoe Fumihiko
Fuji Electric & Co., Ltd.
Swarthout Brent
Wu Daniel J.
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