Simply understand MODBUS function code and partition

  If these two pictures In contrast , You can understand Partition and function code It's all right . 

 

 

Here partitions can understand bit data types , Function codes are different operations on types .

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Look at this software again, you can understand , Here is the function code , 

  If you click 16 The following pop-up box will appear ：（16 The corresponding is to write multiple registers ）

  Another example ： It means that different function codes deal with different areas

  Such as ：

  Read （03） Multiple holding registers （4x）