public class MasterTest {
public static void main(String[] args) throws Exception {

	String commPortId = "/dev/ttyUSB0";
	int baudRate = 9600;
	int flowControlIn = 0;
	int flowControlOut = 0;
	int dataBits = 0;
	int stopBits = 0;
	int parity = 1;
	
	TestSerialPortWrapper wrapper = new TestSerialPortWrapper(commPortId, baudRate, flowControlIn, flowControlOut, dataBits, stopBits, parity);
    
    IpParameters ipParameters = new IpParameters();
    ipParameters.setHost("localhost");

    ModbusFactory modbusFactory = new ModbusFactory();

     ModbusMaster master = modbusFactory.createRtuMaster(wrapper);
    try {
        master.setTimeout(1000);
        master.setRetries(0);
        master.init();
        int slaveId = 2;
      BaseLocator<Number> locator = BaseLocator.holdingRegister(slaveId, 50, DataType.EIGHT_BYTE_INT_UNSIGNED);
        master.setValue(locator, 10000000);
        System.out.println(master.getValue(locator));
    }
    finally {
        master.destroy();
    }
}