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Modbus is a serial communications protocol originally published by Modicon (now Schneider Electric) in 1979 for use with its programmable logic controllers (PLCs). Simple and robust, it has since become a de facto standard communication protocol and is now a commonly available means of connecting industrial electronic devices.
A rebus (/ËrÄ-bÉs/) is an allusional device that uses pictures to represent words or parts of words. It was a favourite form of heraldic expression used in the Middle Ages to denote surnames. For example, in its basic form, three salmon (fish) are used to denote the surname Salmon. A more sophisticated example was the rebus of Bishop Walter Lyhart (d.1472) of Norwich, consisting of a stag (or hart) lying down in a conventional representation of water.