Table 1 Modbus function code categories
Function Code (DEX) | Categories |
|---|---|
1∼64 | Public function codes |
(Define reading, writing…etc.) | |
65∼72 | User-Defined |
73∼99 | Public function codes |
100∼110 | User-Defined |
111∼127 | Public function codes |
128∼255 | Reserved |