Method of transmitting a high-priority message in a lighting...

H - Electricity – 05 – B

Patent

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H05B 37/02 (2006.01)

Patent

CA 2676641

A lighting control system having a plurality of control devices coupled to a communication link operates with a communication protocol that allows the system to expeditiously process high-priority events while operating communicate at a low enough baud rate to allow for a free-wiring topology of the communication link. The transmission of regular-priority messages is suspended if any of the control devices has a high-priority message to transmit. To signal that a control device has a high-priority message to transmit, each control device is operable to transmit a break character in a predetermined time period after the transmission of one of the digital messages. After the transmission of the break character, the transmission of the regular-priority messages on the communication link is suspended to allow the high-priority message to be transmitted quickly.

L'invention porte sur un système de commande d'éclairage comportant plusieurs dispositifs de commande couplés à une liaison de communication et fonctionnant avec un protocole de communication qui permet au système de traiter rapidement des événements prioritaires tout en fonctionnant à un débit de bauds suffisamment bas pour tenir compte de la topologie à connexions libres de la liaison de communication. La transmission de messages à priorité normale est suspendue si l'un des dispositifs de commande a un message ultra prioritaire à transmettre. Pour signaler qu'un dispositif de commande a un message ultra prioritaire à transmettre, chaque dispositif de commande est habilité à transmettre un caractère de pause pendant une période prédéterminée suivant la transmission d'un des messages numériques. Après la transmission du caractère de pause, la transmission des messages de priorité normale sur la liaison de communication est suspendue pour permettre au message ultra prioritaire d'être transmis rapidement.

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