Modbus Poll Bytes Missing Error Fixed

Try reading just one register (Quantity: 1). If that works, gradually increase the quantity until you find the limit.

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: modbus poll bytes missing error fixed