System for collecting alarms from a set of stations
First Claim
1. A system for collecting alarms from a set of n stations each specified by an address, said system comprising:
- a central station where alarms are brought together;
a first and a second interface in each station;
means connecting all said first interfaces in series with the central station via a first loop and for connecting all said second interfaces in series with the central station via a second loop link;
each loop link comprising;
a message loop conveying messages transmitted by the central station to at least one of the interfaces, and messages emitted by the interfaces to the central station;
a state control loop conveying a state control signal delivered by the central station to set one of an active and standby operating mode in all of the interfaces;
said active operating mode enabling an interface to be remotely controlled by the central station, said standby operating mode disabling an interface to be remotely controlled, but for test purposessaid first interfaces and said second interfaces being respectively in said two operating modes; and
1 Assignment
0 Petitions
Accused Products
Abstract
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.
-
Citations
16 Claims
-
1. A system for collecting alarms from a set of n stations each specified by an address, said system comprising:
-
a central station where alarms are brought together; a first and a second interface in each station; means connecting all said first interfaces in series with the central station via a first loop and for connecting all said second interfaces in series with the central station via a second loop link;
each loop link comprising;a message loop conveying messages transmitted by the central station to at least one of the interfaces, and messages emitted by the interfaces to the central station; a state control loop conveying a state control signal delivered by the central station to set one of an active and standby operating mode in all of the interfaces;
said active operating mode enabling an interface to be remotely controlled by the central station, said standby operating mode disabling an interface to be remotely controlled, but for test purposessaid first interfaces and said second interfaces being respectively in said two operating modes; and - View Dependent Claims (3, 5, 6, 7, 8, 9, 16)
-
- 2. a clock signal loop conveying a clock signal delivered by the central station to all of the interfaces.
Specification