Signal transmission apparatus

Communications: electrical – Condition responsive indicating system – With particular system function

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Details

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

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