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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.
Definition of:bus. A shared digital pathway between resources and devices. In a computer, there are two major types: the system bus and peripheral bus. The system bus, also known as the frontside bus or local bus, is the internal path from the CPU to memory and is split into address bus and data bus subsets.