Examples

List Ports

String[] ports = SerialPortList.getPortNames();
for(int i = 0; i < ports.length; i++) {
   System.out.println(ports[i]);
}

Write Data

import static jssc.SerialPort.*;

SerialPort port = new SerialPort("COM1");
port.openPort();
port.setParams(BAUDRATE_9600,  DATABITS_8, STOPBITS_1, PARITY_NONE);
// port.setParams(9600, 8, 1, 0); // alternate technique
port.writeBytes("Testing serial from Java".getBytes());
port.closePort();

Read Data

import static jssc.SerialPort.*;

SerialPort port = new SerialPort("COM1");
port.openPort();
port.setParams(BAUDRATE_9600,  DATABITS_8, STOPBITS_1, PARITY_NONE);
// port.setParams(9600, 8, 1, 0); // alternate technique
byte[] buffer = port.readBytes(10 /* read first 10 bytes */);
serialPort.closePort();

Event Listener

Note: The mask is an additive quantity, thus to set a mask on the expectation of the arrival of Event Data (MASK_RXCHAR) and change the status lines CTS (MASK_CTS), DSR (MASK_DSR) we just need to combine all three masks.

import static jssc.SerialPort.*;

SerialPort port = new SerialPort("COM1"); 
port.openPort();
port.setParams(BAUDRATE_9600,  DATABITS_8, STOPBITS_1, PARITY_NONE);
// port.setParams(9600, 8, 1, 0); // alternate technique
int mask = SerialPort.MASK_RXCHAR + SerialPort.MASK_CTS + SerialPort.MASK_DSR;
port.setEventsMask(mask);
port.addEventListener(new MyPortListener(port) /* defined below */);

/*
 * In this class must implement the method serialEvent, through it we learn about 
 * events that happened to our port. But we will not report on all events but only 
 * those that we put in the mask. In this case the arrival of the data and change the 
 * status lines CTS and DSR
 */
static class MyPortListener implements SerialPortEventListener {
   SerialPort port;
   public MyPortListener(SerialPort port) {
      this.port = port;
   }
   public void serialEvent(SerialPortEvent event) {
      if(event.isRXCHAR()){ // data is available
         // read data, if 10 bytes available 
         if(event.getEventValue() == 10){
            try {
               byte buffer[] = port.readBytes(10);
            } catch (SerialPortException ex) {
               System.out.println(ex);
            }
         }
      } else if(event.isCTS()){ // CTS line has changed state
         if(event.getEventValue() == 1){ // line is ON
            System.out.println("CTS - ON");
         } else {
            System.out.println("CTS - OFF");
         }
      } else if(event.isDSR()){ // DSR line has changed state
         if(event.getEventValue() == 1){ // line is ON
            System.out.println("DSR - ON");
         } else {
            System.out.println("DSR - OFF");
         }
      }
   }
}