Specify the number of sequential registers you want to read. Step 4: Execute and Analyze Data
| Problem | Most Likely Cause | Solution | | :--- | :--- | :--- | | | Wrong baud rate or slave ID. | Verify device settings. Start at 9600 baud, ID 1. | | "Illegal Function" | Using the wrong function code. | Try Function 04 (Input Reg) instead of 03 (Holding). | | Serial Port open error | Another software is using COM5. | Close C-more, RSLogix, or terminal emulators. | | TCP/IP Connection refused | Firewall blocking port 502. | Open Windows Defender Firewall > Allow an app > Port 502. | | Garbled data (65535) | Wrong data format (Byte/Word order). | Click Display > Format > Try 32-bit Float or Word Swap . | rilheva modbus poll download
If a Windows User Account Control (UAC) prompt appears, click to grant administrative permissions. Specify the number of sequential registers you want to read
Even robust tools can occasionally encounter problems. Here are solutions to frequent issues reported by users: Start at 9600 baud, ID 1
Disclaimer: This article is for educational purposes. Modbus Poll is a trademark of Witte Software. Rilheva is a trademark of Rilheva BV. Always download software from official distribution channels.
Users can manually add device registers, define addresses (decimal format), and set data types. Data Manipulation: Includes built-in multipliers