How to request Preset Multiple Register that is Write Multiple Register(Function Code:16) using RTU ? Can you provide any example or test class ?

[shaileshsathe]

Here how I am using it but don't know whether its correct and how to check response for the same. Please let me know if I am missing something in below code.

WriteMultipleRegistersRequest multipleRegistersRequest = null;
            WriteMultipleRegistersResponse multipleRegistersResponse = null;
            SerialUtils.setSerialPortFactory(new SerialPortFactoryJSerialComm());
            
            SerialParameters serialParameters = new SerialParameters();
            serialParameters.setBaudRate(SerialPort.BaudRate.BAUD_RATE_9600);
            serialParameters.setParity(SerialPort.Parity.NONE);
            serialParameters.setDataBits(8);
            serialParameters.setStopBits(1);
            serialParameters.setDevice("COM5");
         try {   
            ModbusMaster m = ModbusMasterFactory.createModbusMasterRTU(serialParameters);
            m.connect();
             System.out.println("Connected");
            multipleRegistersRequest = new WriteMultipleRegistersRequest();
            multipleRegistersRequest.setServerAddress(1);//ModbusAddress of Slave device to be read
            multipleRegistersRequest.setStartAddress(458); // Start Address
            multipleRegistersRequest.setRegisters(new int[]{14,28,65,200}); //Values to write at different registers
           
            m.setResponseTimeout(500);
            m.processRequest(multipleRegistersRequest);

            multipleRegistersResponse = (WriteMultipleRegistersResponse) multipleRegistersRequest.getResponse();
             System.out.println("<> "+multipleRegistersResponse.getValue());
             System.out.println("<> "+multipleRegistersResponse.toString());
            
        } catch (SerialPortException ex) {
            Logger.getLogger(JLibModbusTestClass.class.getName()).log(Level.SEVERE, null, ex);
        } catch (ModbusIOException ex) {
            Logger.getLogger(JLibModbusTestClass.class.getName()).log(Level.SEVERE, null, ex);
        } catch (ModbusNumberException ex) {
            Logger.getLogger(JLibModbusTestClass.class.getName()).log(Level.SEVERE, null, ex);
        }

I have updated my code.But Still I am getting error as following

com.intelligt.modbus.jlibmodbus.exception.ModbusIOException: java.io.IOException: com.fazecast.jSerialComm.SerialPortTimeoutException: The read operation timed out before any data was returned.
	at com.intelligt.modbus.jlibmodbus.net.transport.ModbusTransportSerial.read(ModbusTransportSerial.java:49)
	at com.intelligt.modbus.jlibmodbus.net.transport.ModbusTransport.readMessage(ModbusTransport.java:69)
	at com.intelligt.modbus.jlibmodbus.net.transport.ModbusTransport.readResponse(ModbusTransport.java:64)
	at com.intelligt.modbus.jlibmodbus.master.ModbusMaster.readResponse(ModbusMaster.java:111)
	at com.intelligt.modbus.jlibmodbus.master.ModbusMaster.processRequest(ModbusMaster.java:134)
	at com.importexportutility.jlibmodbustest.JLibModbusTestClass.main(JLibModbusTestClass.java:52)
Caused by: java.io.IOException: com.fazecast.jSerialComm.SerialPortTimeoutException: The read operation timed out before any data was returned.
	at com.intelligt.modbus.jlibmodbus.serial.SerialPortJSerialComm.read(SerialPortJSerialComm.java:100)
	at com.intelligt.modbus.jlibmodbus.serial.SerialPort$2.read(SerialPort.java:77)
	at com.intelligt.modbus.jlibmodbus.net.stream.base.LoggingInputStream.read(LoggingInputStream.java:52)
	at com.intelligt.modbus.jlibmodbus.net.stream.InputStreamRTU.read(InputStreamRTU.java:55)
	at com.intelligt.modbus.jlibmodbus.net.transport.ModbusTransport.createMessage(ModbusTransport.java:51)
	at com.intelligt.modbus.jlibmodbus.net.transport.ModbusTransportSerial.read(ModbusTransportSerial.java:45)
	... 5 more
Caused by: com.fazecast.jSerialComm.SerialPortTimeoutException: The read operation timed out before any data was returned.
	at com.fazecast.jSerialComm.SerialPort$SerialPortInputStream.read(SerialPort.java:1328)
	at com.intelligt.modbus.jlibmodbus.serial.SerialPortJSerialComm.read(SerialPortJSerialComm.java:98)
	... 10 more