System.out.println("jModbus Modbus Slave (Server)");
//1. prepare a process image
spi = new SimpleProcessImage();
spi.addDigitalOut(new SimpleDigitalOut(true));
spi.addDigitalOut(new SimpleDigitalOut(true));
spi.addDigitalIn(new SimpleDigitalIn(false));
spi.addDigitalIn(new SimpleDigitalIn(true));
spi.addDigitalIn(new SimpleDigitalIn(false));
spi.addDigitalIn(new SimpleDigitalIn(true));