![]() Modbus also shows differences in regard to the data transfer.Īccordingly, we can distinguish between the following operation modes:Īs each communication participant can send messages via the bus, each of them must receive a corresponding and unique address. ![]() With this, the two available versions of Modbus refer to the Ethernet and the serial interface (EIA-232 & EIA-485). The open Modbus protocol enables communication between one master and several slaves. As an open protocol, Modbus has found its way into industrial communication and is being used there as ubiquitous de-facto standard for programmable logic controllers. The Modbus protocol is a communication protocol based on the master-slave principle, which was developed by Gould-Medicon.
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