| Function code (decimal) | Function code (hexadecimal) | Name | Notes |
|---|---|---|---|
| 03 | 03hex | Read Holding Registers | Can be used for reading pressure value using unit ID 240, and for reading probe registers, for example, measurement results, using unit ID 241 or 242. 1 |
| 43 / 14 | 2Bhex / 0Ehex | Read Device Identification | Can be used only for reading transmitter identification information using unit ID 240. |
1 See the connected probe's Modbus documentation for a
probe-specific register list.