Societe Anonyme Dite: Alcatel Cit

Dominique Philippe

Jean-Yves Cozic

A system for collecting alarms from a set of stations includes a central station (SC) connected in series with the stations over a loop link includes a message loop (BM), a clock signal loop (BH), and a state control loop (BCE). Each station includes an interface (5) connected to the various loops of the link. The message loop conveys messages transmitted by the central station and intended for at least one of the interfaces, replies from the interfaces, and messages transmitted by the interfaces and intended for the central station. The clock signal loop conveys a clock signal transmitted by the central station and the state control loop conveys a state control signal also transmitted by the central station, the signal taking a first value for an active operating mode of the interfaces and a second value for a standby operating mode of the interfaces. Changing over from the first value to the second also serves to reset the interfaces to zero. The clock signal and the state control signal travel round the loop in one direction while messages travel round the loop in the opposite direction.

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Begard, France

Dominique Philippe