A: Yes. Virtual serial port emulators sometimes buffer data, breaking the 3.5 character timing. Switch to a physical COM port for testing.
If you can tell me what (PLC, sensor) you are using and the connection type (USB-to-RS485, Ethernet), I can give you more specific debugging steps.
Rather than polling many discontinuous, scattered registers, configure your PLC or slave device to map all necessary data into a single continuous block. Reading one large contiguous block is much faster and less prone to "Bytes missing" errors than sending dozens of small requests. modbus poll bytes missing error fixed
Try reducing the number of registers you are reading at once. Instead of registers, try reading 5. Check for Signal Noise or Converter Issues
Change the "Type" from Modbus TCP/IP to (sometimes called "Encapsulated RTU"). A: Yes
Use Modbus Poll’s "Log to File" feature. Review the log weekly for intermittent byte loss that might indicate a degrading cable.
Potential differences between devices on an RS485 network can cause communication errors. If you can tell me what (PLC, sensor)
To resolve the "Modbus poll bytes missing error," follow these step-by-step troubleshooting and fix guidelines: