PrinterTest.java

package mx.hash.print;


import jssc.SerialPort;
import jssc.SerialPortException;

public class PrinterTest {

    public static void main(String[] args) {
        SerialPort serialPort = new SerialPort("COM7");
        try {
            // Esto funciona
            
            serialPort.openPort();//Open serial port
            serialPort.setParams(SerialPort.BAUDRATE_9600,
                    SerialPort.DATABITS_8,
                    SerialPort.STOPBITS_1,
                    SerialPort.PARITY_NONE);//Set params. Also you can set params by this string: serialPort.setParams(9600, 8, 1, 0);
            
            for (int i = 0; i < 10; i++) {
                serialPort.writeBytes("¡¡Hola Mundo!!\n".getBytes());//Write data to port
            }

            serialPort.closePort();//Close serial port
        } catch (SerialPortException ex) {
            System.out.println(ex);
        }
    }
}