| Error code | Description |
|---|---|
| 16#8180 | Invalid value for MB_DB parameter |
| 16#8186 | Invalid slave station address |
| 16#8187 | Invalid value at holdingRegister parameter |
| 16#8280 | Negative acknowledgment when reading module |
| 16#8281 | Negative acknowledgment when writing module |
| 16#8381 | The function code is not supported or is not supported for broadcast. |
| 16#8382 | Invalid length information in the request frame |
| 16#8383 | Invalid data address in the request frame |
| 16#8384 | Invalid data value error in the request frame |
| 16#8385 | The diagnostic value is not supported by the Modbus slave (function code 08) |