Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1996-04-02
1998-09-29
Mullen, Jr., Thomas J.
Communications: electrical
Condition responsive indicating system
With particular system function
340531, 340533, 340568, G08B 2600
Patent
active
058150749
ABSTRACT:
A signal transmission apparatus including a main unit having a signal transmission terminal, and one or more sub units (or repeaters) each having first and second signal transmission terminals. A loop connection line is provided between the main unit and a first sub unit, and additional loop connection lines are provided between subsequent pairs of sub units to convey signals from the main unit to each of the sub units, and from each of the sub units to the main unit. The main unit includes a controller, a signal generator for generating and sending a first signal to one of the sub units, and a signal processor for processing a second signal returned from one of the sub units in response to the first signal. Each of the sub units includes a controller, a destination signal determination section, and a signal transfer section for selectively capturing and transferring a signal according to its destination address.
REFERENCES:
patent: 4041470 (1977-08-01), Slane et al.
patent: 4400694 (1983-08-01), Wong et al.
patent: 4573041 (1986-02-01), Kitagawa et al.
patent: 4994788 (1991-02-01), Phillippe et al.
patent: 5168273 (1992-12-01), Solomon
Ichimiya Nobuyuki
Kinouchi Shin
Namioka Seishi
Sasagawa Shinichi
Alps Electric Co. ,Ltd.
Mullen Jr. Thomas J.
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