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Modbus TCP in router communication

Modbus TCP in router communication

The Modbus is a request-response protocol based on master/slave or client/server architecture. In the master-slave relationship, communication always occurs in pairs. One device must initiate a request and then wait for a response. The initiating device (named as master device) is responsible for initiating each interaction. Usually, the master device is an HMI or SCADA system, and the slave device is a sensor, programmable logic controller (PLC) or programmable automatic controller (PAC). In a standard Modbus network, there is one Master and up to 247 Slaves. Each slave has a unique Slave Address from 1 to 247.

The modbus protocol mainly used for serial port and Ethernet version. For serial port connections, there are two protocols as modbus RTU and mobus ASCII, which are slightly different in data and protocol details. For Ethernet connections such as modbus TCP, it does not require verification and computation.

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  • Shenzhen, Guangdong, China
  • Christina Feng

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