Modbus Poll receives only the first few bytes of a late response, calculates the expected length, finds it short, and reports "Bytes Missing."
The slave may be taking too long to process. Increase the "Timeout" setting in Modbus Poll ( Connection -> Disconnect -> Setup ). modbus poll bytes missing error
To get a more precise solution for your error, please tell me: Are you using RS-485 or RS-232 ? What is your baud rate ? Modbus Poll receives only the first few bytes
Ensure the Modbus Poll settings strictly match the slave device configuration. Matches? (e.g., 9600, 19200, 115200) Data Bits/Parity/Stop Bits: Matches? (e.g., 8N1, 8E1) calculates the expected length
In modern laptops without native COM ports, engineers rely on USB-to-RS-485/232 converters. Cheap converters (using counterfeit FTDI or Prolific chips) suffer from: