Join Device Modbus Device

When registering a device, we need to fill 1.register name 2.register address 3.R/W method
The R/W method has read function 01,02,03,04 write function 05,06,15,16.
Can i know the details of the list of those R/W method?
thank you so much

Modbus and it's read write method are well documented. A simple Google search will reveal what these read write functions mean. E.g....

Function Code	Register Type
1	Read Coil
2	Read Discrete Input
3	Read Holding Registers
4	Read Input Registers
5	Write Single Coil
6	Write Single Holding Register
15	Write Multiple Coils
16	Write Multiple Holding Registers

Taken from...

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