RXTX serial and parallel I/O libraries usage guidelines
RXTX serial and parallel I/O libraries usage guidelines
Introduction: RXTX is a Java library for serial and parallel I/O communication.It allows developers to communicate with serial and parallel devices in the Java program, such as serial ports and mouth.
The RXTX library provides a set of categories and methods to achieve reading and writing operations of serial and parallel devices.This article will introduce in detail how to use the RXTX library to communicate serial and parallel I/O, and provide some Java code examples to help understand.
Install the RXTX library:
First, you need to download and install the RXTX library.You can get the library from RXTX's official website (http://rit://Rxtx.qbang.org) or Maven central warehouse (https://mvnrepository.com/artifact/org.rxtx/RxtX).Make sure to choose a library document compatible with your operating system and Java version.
Steps to use the RXTX library:
1. Import library file:
Import the RXTX library file into your project.You can manually copy the library file to the project's LIB directory, or use the construction tool (such as Maven or Gradle) for dependence management.
2. Open the serial or parallel port:
Use the RXTX library's `Com forwardIdIDENTIFIFIER` class to open the serial or parallel device port.The following is an example code:
import gnu.io.CommPort;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
public class SerialPortExample {
public static void main(String[] args) {
try {
CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier("/dev/ttyUSB0");
if (portIdentifier.isCurrentlyOwned()) {
System.out.println ("ports occupied");
} else {
Commport Commport = Portidentifier.open ("Cable Example", 2000);
if (commPort instanceof SerialPort) {
SerialPort serialPort = (SerialPort) commPort;
serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
serialPort.setFlowControlMode(SerialPort.FLOWCONTROL_NONE);
// Perform the serial communication operation here
Serialport.close (); // Close the serial port
} else {
System.out.println ("Error: only for serial communication");
}
}
} catch (Exception e) {
System.err.println(e.toString());
}
}
}
3. Cross or parallel communication:
Once you open the serial or parallel port, you can use the method of `Serialport` or` ParallelPort` to perform actual communication operations.Here are some example code:
Read data:
import gnu.io.SerialPortEvent;
import gnu.io.SerialPortEventListener;
import java.io.BufferedReader;
import java.io.InputStreamReader;
public class SerialPortReader implements SerialPortEventListener {
private BufferedReader bufferedReader;
public SerialPortReader() {
bufferedReader = new BufferedReader(new InputStreamReader(System.in));
}
@Override
public void serialEvent(SerialPortEvent event) {
if (event.getEventType() == SerialPortEvent.DATA_AVAILABLE) {
try {
String inputLine = bufferedReader.readLine();
System.out.println ("Received data:" + Inputline);
} catch (Exception e) {
System.err.println(e.toString());
}
}
}
}
data input:
import gnu.io.SerialPort;
import java.io.OutputStream;
public class SerialPortWriter {
private OutputStream outputStream;
public SerialPortWriter(SerialPort serialPort) {
try {
outputStream = serialPort.getOutputStream();
} catch (Exception e) {
System.err.println(e.toString());
}
}
public void writeData(String data) {
try {
outputStream.write(data.getBytes());
} catch (Exception e) {
System.err.println(e.toString());
}
}
}
The above is the basic steps and sample code using the RXTX library for serial and parallel I/O communication.You can expand these examples according to your needs and implement communication functions with serial and parallel devices in your Java application.I hope this article can help you better understand and use the RXTX library.
