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A better way to learn about The Modbus Protocol and RS485

The Modbus protocol is still one of the most widely used automation protocols in the process industry. If you are a technical person who has had to implement control systems, especially PLC-based control systems, then you would know that a knowledge of Modbus is essential in connecting equipment from different manufacturers. Furthermore, Modbus more often than not is implemented over the RS485 physical medium. So knowing Modbus RS485 networking is essential for control systems implementation. But most professionals learn about the Modbus protocol by scouring the internet for bits and pieces of information, which takes time and also can be quite confusing. This is what happened to me when I came out of university with a degree in Elec. Eng....
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