TCP/IP merely presents a new transmission base in Modus TCP technology. In order to standardize the internet, development flowed into the organisation Internet Engineering Task Force (IETF) and so the complete Modbus model and corresponding services have remained unchanged. Modbus protocol is today seen as an openly conceived internet-draft-standard, originating from Schneider Automation. The Modbus protocol which was already in operation in 1979 has been extended by Ethernet-TCP/IP transmission technology.
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