Method for securing the display on a screen of mimic diagrams representing the status of a system
AssigneeAlcatel Alsthom Compagnie Generale d'Electricite
InventorFran.cedilla.ois Simon
Life of this patent
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Abstract
In a method for securing the display on a screen of a workstation of mimic diagrams reflecting the status of a system connected to the workstation, a first counter is maintained in the system and a second counter is maintained in the workstation. The system periodically transmits to the workstation image data defining a mimic diagram reflecting the current status of the system, together with the first counter and a signature. In response, the workstation displays on the screen a mimic diagram based on the image data received and calculates a test value conditioned by the first and second counters, this value providing a basis for detecting a display error.
Claims3
Method for securing the display on a screen of a workstation of mimic diagrams reflecting the status of a system connected to the workstation, the method including:
- maintaining a first counter in said system and maintaining a second counter in said workstation;
- periodically, in said system, incrementing said first counter, calculating a first signature from said first counter and from image data generated by said system for a current period and defining a mimic diagram reflecting the current status of said system, and storing in memory said image data, said first counter and said first signature;
- in said workstation, in response to the transmission of said data, storage in memory of said image data, said first counter and said first signature, displaying on said screen a mimic diagram based on said image data stored in said memory, incrementing said second counter, calculating a second signature from said image data stored in said memory and said second counter, and calculating a test value from said second signature, from said first signature and from said first counter stored in memory, said test value providing a basis for detection of a display error.
Dependencies are inferred from the claim text.