This error occurs when the Modbus Poll master expects a specific number of bytes based on the requested function code (e.g., Read Holding Registers) but receives a truncated or incomplete message from the slave device. Response Timeout (Too Short) :
Disclaimer: This guide is designed for troubleshooting Modbus RTU/TCP systems. Always exercise caution when working with industrial electrical equipment. If you'd like, I can: modbus poll bytes missing error fixed
If the problem persists, post the (Display → Communication → Save) and the exact expected vs. received byte count — that usually reveals the exact cause. This error occurs when the Modbus Poll master
Increase the "Response Timeout" setting in Modbus Poll (under Connection -> Connection Setup) to allow more time for the slave device to respond, especially if the device is slow or on a high-latency network. Increase Inter-frame Delay: If you'd like, I can: If the problem