G - Physics – 06 – F
Patent
G - Physics
06
F
G06F 13/42 (2006.01) G06F 13/40 (2006.01)
Patent
CA 2238719
An apparatus for and method of serially transmitting a message between first and second devices (302, 304) coupled to a data or clock line (310) in a process control device (10) is disclosed. A first transition (212) of the data or clock signal is generated during a signal cycle. A second transition (214) of the signal is generated during the first signal cycle in order to control the duty cycle of the signal during the first signal cycle. If the duty cycle of the signal during the first signal cycle has a first value, then the first signal cycle is representative of a first data state transmitted between the first and second devices (302, 304). If the duty cycle of the signal during the first signal cycle has a second value, then the first signal cycle is representative of a second data state transmitted between the first and second devices (302, 304).
La présente invention concerne un appareil et un procédé permettant d'émettre un message en série entre un premier et un second appareil (302, 304) couplés à une ligne de données ou d'horloge (310) dans un appareil de commande de processus (10). Une première transition (212) du signal de données ou d'horloge est générée au cours d'un cycle de signal. Une seconde transition (214) du signal est générée au cours du premier cycle de signal de façon à réguler le cycle de service du signal au cours du premier cycle de signal. Si le cycle de service du signal au cours du premier cycle de signal a une première valeur, ledit premier cycle de signal est caractéristique d'un premier état de données émises entre le premier et le second appareil (302, 304). Si le cycle de service du signal au cours du premier cycle de signal a une second valeur, ledit premier cycle de signal est caractéristique d'un second état de données émises entre le premier et le second appareil (302, 304).
Marks & Clerk
Rosemount Inc.
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