Communications: electrical – Continuously variable indicating – With meter reading
Patent
1992-12-18
1995-03-21
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
340825, 307127, 375 36, G05B 2302, H02B 124, H04B 300
Patent
active
054000173
ABSTRACT:
A transmission device is disclosed wherein a plurality of control units each having a transmitting/receiving block connected to one another through a positive signal line and a negative signal line, and bidirectional signal transmission is carried out with a predetermined polarity among the control units. The signal lines of the transmission device are connected to a power superposing source for applying a predetermined DC voltage to the signal lines and each of the control units include a signal switch connected to the transmitting/receiving block for inverting and switching a transmission signal sent or received by the transmitting/receiving block, and a polarity judging device adapted to supply a homopolar signal when the potential of the positive signal line is higher than the potential of the negative signal line, and adapted to supply a heteropolar signal when the potential of the positive signal line is lower than the potential of the negative signal line. The control unit further includes a changeover control adapted to supply a switching signal to the signal switch such that the signal switch inverts and switches the transmission signal, when the polarity judging device supplies a heteropolar signal.
REFERENCES:
patent: 4647912 (1987-03-01), Bates et al.
patent: 5182466 (1993-01-01), Ohkubo
patent: 5194758 (1993-03-01), Ver Meer
patent: 5233602 (1993-08-01), Kuwano
patent: 5257160 (1993-10-01), Yokohama et al.
Shima Kiyoshi
Sogabe Masaharu
Uchida Kouji
Yoshisaka Keiichi
Daikin Industries Ltd.
Rinehart Mark H.
Yusko Donald J.
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