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 it is now a commonly available means of connecting industrial
electronic devices. The main reasons for the use of Modbus in the industrial environment are:
- developed with industrial applications in mind
- openly published and royalty-free
- easy to deploy and maintain
- moves raw bits or words without placing many restrictions on vendors