If the application fails to poll data, look for these common error codes and connection snags. Error Code / Message Probable Cause Actionable Solution Broken physical link or wrong IP/COM port selection. Check cabling, verify device power, and ping the target IP. Illegal Data Address (0x02) Requested register does not exist on the slave device. Verify the target address against the device's Modbus map. Illegal Data Value (0x03) Written value is outside the device's accepted boundaries.
Community‑provided templates are available for various Wiren Board devices; search for “wb‑community/rilheva‑modbus‑poll‑templates” on GitHub. rilheva modbus poll download
The status bar will display error messages like "Timeout" (wiring/IP issue) or "Illegal Data Address" (incorrect register map). Troubleshooting Common Connection Errors If the application fails to poll data, look
Click or Start Poll . The utility will send cyclic requests to the device. Illegal Data Address (0x02) Requested register does not
In Rilheva Modbus Poll, open the configuration window. Select Modbus RTU from the connection type menu. Select the correct COM Port (e.g., COM3 ).
If the numbers look erratic, the byte order or word order might be reversed. Adjust the data formatting settings in the utility (e.g., switching from Big-Endian to Little-Endian). Transitioning from Modbus Poll to Rilheva Cloud
(If you want, I can locate the official download page or list alternative Modbus client tools.)