The Modbus protocol was developed by Modicon, now a brand of Schneider Electric.
It was originally designed in 1979 for use with its programmable logic controllers (PLCs) in industrial applications.
Modbus is a serial communications protocol that has become a de facto standard communication protocol and is now commonly used to connect industrial electronic devices. The main reasons for its use are its simplicity and the fact that it is open-source, which allows manufacturers to build their own implementations of the standard.
"A Guide to the Modbus Protocol," Schneider Electric.
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