If you are using a cheap USB-to-RS485 converter, the chipset (often counterfeit Prolific or CH340) may struggle with high-speed data.
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 modbus poll bytes missing error fixed
Even though RS-485 is differential, a floating ground can cause enough noise to drop bytes. Ensure a signal ground wire connects all devices. 2. Adjust Timing and Timeouts If you are using a cheap USB-to-RS485 converter,
Ensure the Master and Slave are identical (e.g., 9600). modbus poll bytes missing error fixed
A single mismatch here will cause the Master to misinterpret the incoming data stream as "missing" or "corrupt."