error logs

2017-05-18 19:06:12.505 [ERROR] [t.wimpi.modbus.io.ModbusRTUTransport] - Last request: 02 02 00 02 00 11 19 f5
2017-05-18 19:06:12.507 [ERROR] [t.wimpi.modbus.io.ModbusRTUTransport] - failed to read: Error reading response (EOF)
2017-05-18 19:06:12.511 [ERROR] [pi.modbus.io.ModbusSerialTransaction] - execute try 1/3 error: I/O exception - failed to read. Request: net.wimpi.modbus.msg.ReadInputDiscretesRequest@f8564b (unit id 2 & transaction 296). Serial parameters: SerialParameters@152adf[portName=/dev/ttyUSB0,baudRate=9600,flowControlIn=none,flowControlOut=none,databits=8,stopbits=1,parity=none,encoding=rtu,echo=false,receiveTimeoutMillis=1500]
2017-05-18 19:06:14.065 [ERROR] [t.wimpi.modbus.io.ModbusRTUTransport] - Last request: 02 02 00 02 00 11 19 f5
2017-05-18 19:06:14.067 [ERROR] [t.wimpi.modbus.io.ModbusRTUTransport] - failed to read: Error reading response (EOF)
2017-05-18 19:06:14.069 [ERROR] [pi.modbus.io.ModbusSerialTransaction] - execute try 2/3 error: I/O exception - failed to read. Request: net.wimpi.modbus.msg.ReadInputDiscretesRequest@f8564b (unit id 2 & transaction 296). Serial parameters: SerialParameters@152adf[portName=/dev/ttyUSB0,baudRate=9600,flowControlIn=none,flowControlOut=none,databits=8,stopbits=1,parity=none,encoding=rtu,echo=false,receiveTimeoutMillis=1500]
2017-05-18 19:06:15.092 [INFO ] [nding.sony.internal.ircc.IrccHandler] - Attempting connection to IRCC device...
2017-05-18 19:06:15.629 [ERROR] [t.wimpi.modbus.io.ModbusRTUTransport] - Last request: 02 02 00 02 00 11 19 f5
2017-05-18 19:06:15.630 [ERROR] [t.wimpi.modbus.io.ModbusRTUTransport] - failed to read: Error reading response (EOF)
2017-05-18 19:06:15.632 [ERROR] [pi.modbus.io.ModbusSerialTransaction] - execute try 3/3 error: I/O exception - failed to read. Request: net.wimpi.modbus.msg.ReadInputDiscretesRequest@f8564b (unit id 2 & transaction 296). Serial parameters: SerialParameters@152adf[portName=/dev/ttyUSB0,baudRate=9600,flowControlIn=none,flowControlOut=none,databits=8,stopbits=1,parity=none,encoding=rtu,echo=false,receiveTimeoutMillis=1500]
2017-05-18 19:06:15.633 [ERROR] [pi.modbus.io.ModbusSerialTransaction] - execute reached max tries 3, throwing last error: I/O exception - failed to read. Request: net.wimpi.modbus.msg.ReadInputDiscretesRequest@f8564b. Serial parameters: SerialParameters@152adf[portName=/dev/ttyUSB0,baudRate=9600,flowControlIn=none,flowControlOut=none,databits=8,stopbits=1,parity=none,encoding=rtu,echo=false,receiveTimeoutMillis=1500]