TAILIEUCHUNG - Supervisory Control & Data Acquisition - Communication Technology Modbus Protocol

An open data communication protocol developed in 1979 Published by Modicon Open structure Flexible Widely known Supplied by many SCADA and HMI software Have OPC Servers 2 serial transmission modes: ASCII 10 bits RTU (Binary) 11 bits Communication interface RS-232/485 Ethernet (TCP/IP) Station Device: 0 ~ 255 Digital input 1xxxx: 4 digits for hexadecimal address (0000 ~ FFFF) 1xxxxx: 5 digital for decimal address (0 ~ 65535) Digital output 0xxxx: 4 digits for hexadecimal address (0000 ~ FFFF) 0xxxxx: 5 digital for decimal address (0 ~ 65535) Analog input 4xxxx: 4 digits for hexadecimal address (0000 ~ FFFF) 4xxxxx: 5 digital for decimal address (0 ~ 65535) Analog output 3xxxx: 4 digits for hexadecimal address (0000 ~ FFFF) 3xxxxx: 5. | Supervisory Control & Data Acquisition Communication Technology Modbus Protocol What is Modbus ? An open data communication protocol developed in 1979 Published by Modicon Open structure Flexible Widely known Supplied by many SCADA and HMI software Have OPC Servers 2 serial transmission modes: ASCII 10 bits RTU (Binary) 11 bits Communication interface RS-232/485 Ethernet (TCP/IP) Application structure (general) Modbus Device (Slave) Modbus Device (Slave) Internet RS-232/485 HMI SCADA Modbus Client (Master) Query-Response Cycle Station Number Data Bytes (Flexible) Error Check Station Number Function Code Data Bytes (Flexible) Error Check Query Response Function Code Hardware classification Station Device: 0 ~ 255 Digital input 1xxxx: 4 digits for hexadecimal address (0000 ~ FFFF) 1xxxxx: 5 digital for decimal address (0 ~ 65535) Digital output 0xxxx: 4 digits for hexadecimal address (0000 ~ FFFF) 0xxxxx: 5 digital for decimal address (0 ~ 65535) Analog input 4xxxx: 4 digits for .

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