If you are at the end of a long daisy chain, ensure you have a 120-ohm resistor across the A and B lines. Without this, signal reflection can cause the tail end of a message to disappear.
If you work with PLCs, RTUs, or energy management systems, you have likely seen it happen. You are running (the classic Windows-based diagnostic tool from ModbusTools), monitoring a slave device. The data updates for a few seconds, maybe a minute. Then, the status bar turns red, or yellow. You look at the log. modbus poll bytes missing error fixed
Would you like a version tailored to a specific Modbus device (e.g., PLC, energy meter) or to a particular industry context? If you are at the end of a
Last updated: October 2025 – tested against Modbus Poll 9.6.0 and Windows 11 24H2. You are running (the classic Windows-based diagnostic tool
Go to Windows Device Manager > Ports > COM Port > Advanced. Try lowering the Transmit and Receive FIFO buffers. This forces the driver to process smaller chunks of data more frequently, preventing byte loss. 5. Check Slave ID and Register Limits