The interaction between client and server (controller and target device) can be depicted as follows. These serve as confirmations on the client side the response messages sent by the servers. These serve as indications of the requested services on the server side the messages sent on the network by the clients to initiate transactions. Modbus messaging is based on a client/server model and employs the following messages: Also note that the Modbus Messaging protocol used with Modbus Serial is the same one used with Modbus Plus and Modbus TCP. The Modbus Messaging protocol is only a protocol and does not imply any specific hardware implementation. ![]() Modbus Messaging protocol is an Application layer (OSI layer 7) protocol that provides client/server communication between devices connected to different types of buses or networks.
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