Modbus communication protocol specification (Chinese) sharing

Today, we are developing Modbus Communication protocol time , A piece of information that is often used , It is Modbus Communication protocol specification ( chinese ) manual , The inside is right Modbus The communication protocol was explained in detail , Explained what is Modbus agreement ,Modbus The data frame structure of 、Modbus Protocol principle 、Modbus And will also explain Modbus Of TCP signal communication .

Some data figures of the manual are shown in the figure ：


Like we developed through Modbus-RTU The way of master-slave communication needs to be familiar Modbus Data frame and function code can be developed , therefore , If you are interested, you can click this link to download the document ：Modbus Protocol specification ( chinese )

My level is limited , The above information is for reference only , If there are mistakes and irregularities , Your advice are most welcome .
Besides, it's not easy to create , Don't copy , If it helps you, I hope you can like it , thank you ~