Modbus functions in the BC8150
In the Modbus protocol, the functions determine whether data is to be read or written, and what kind of data is involved.
Function | Code | Description |
|---|---|---|
3 | Read analog outputs and inputs / GPR | |
4 | Read analog inputs / GPR | |
6 | Write one analog output / GPR | |
8 | Diagnosis | |
16 | Write a number of analog outputs / GPRs | |
23 | Write and read a number of process data outputs / GPRs |
GPR (General Preset Register) - register structure of the Modbus interface (see Appendix)