Read Input Registers (04) – This command will read the binary contents of Read Holding Registers (03) – Reads the binary contents of holding registers (4x reference addresses) in the slave device.Read Coil Status (01) – This command will read the ON/OFF status of discrete outputs or coils (0xxxx reference addresses) in the slave/server.The request data typically includes register addresses, offset values, and data to be written. The client (master) provides the server (slave) with additional information required by the slave to complete the operation specified by the function code. The Modbus TCP protocol offers fast communication to many devices in a single network. On a Modbus TCP/IP network, a device can be: ModbusTCP protocol uses a 10 Mbps Ethernet standard to convey the entire structure of Modbus messages. At the same time, several clients can send requests, many servers can respond, and a client can talk to various servers.Ī server can simultaneously respond to several clients.įurthermore, Ethernet directs and ensures data delivery to all the devices at the same time. Therefore, many devices are the same time clients and servers.Ī network can bring together many clients. Like Modbus RTU, Modbus TCP operates on a client/server principle, but in this case, the client (master) initiates both requests and responses from a server (slave).Īny device can be a client or a server. Modbus TCP is basically the Modbus RTU protocol with a TCP interface running on Ethernet.
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