There are three ADUs: ASCII, remote terminal unit (RTU), and TCP/IP. The first layer is the application data unit (ADU), which is what most people consider to be the “type” of Modbus used.
In Modbus, this request is a layered set of data. The Master-Slave, Request-Response Relationship of Modbus Devices Even on modern TCP/IP networks, it gives the master a high degree of control over slave behavior, which is helpful in some designs.įigure 1. This architecture gives the master full control over the flow of information, which has benefits on older multidrop serial networks. The Modbus protocol follows a master and slave architecture where a master transmits a request to a slave and waits for the response.
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