Method for transmitting messages between a central station and s

Details Method for transmitting messages between a central station and s Method for transmitting messages between a central station and s

1986-03-28

1987-05-05

Schreyer, Stafford D.

Telegraphy

Systems

375 36, H04Q 916

Patent

active

046634991

ABSTRACT:
A method for transmitting a message by a two way wire connection between a central control and survey station (1) and several remote detection stations (3A-3N) adapted to generate a signal representative of at least one parameter of its environment, particularly for the monitoring of buildings, during which the central station (1) successively generates addresses assigned to each of the remote stations (3A-3N), these latter in response to the reception of this address emitting a message characteristic of the value of the corresponding environment parameter, characterized in that said addresses are generated by the central station (1) by modulation of a continuous voltage permanently applied to said telegraphic connection, and in that each remote station (3A-3N) transmits its message by amplitude modulation of the current on said line by application of said voltage to said line.

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