My own notes and discoverings about Modbus devices I'm working with.
| Register Prefix (Modicon Notation) |
Description | Usable Function Codes (FC) |
|---|---|---|
| 0x | Coils or Discrete Outputs (digital outputs) |
1: read 5: write 15: write multiple |
| 1x | Input Status or Discrete Inputs (digital inputs) |
2: read |
| 3x | Input Register (values from analog sensors) |
4: read |
| 4x | Holding Register or Keep Register (configuration parameters) |
3: read 6: write 16: write multiple |
Client (Modbus TCP) = Master (Modbus RTU) : device who requests data or sends configuration parameters to devices (PLC)
Server (Modbus TCP) = Slave (Mosbus RTU) : device who transmits data, actuator, relay, sensor, IO board etc
| Image | Name | Description |
|---|---|---|
 |
N4DSC08 | 8 channel DS18B20 temperature collector |