How to read a string/character from com port with java?

Question

I googled lot about reading from a com port but it seems very difficult work for me. I found this but I don't know how to add jSSC library to my netbeans project.

Please help me by giving instructions to adding that library to my project or giving a simple code to read a string/character from a com port.

Duffydake · Accepted Answer · 2015-02-28 04:28:45Z

2

To add jSSC library in netbeans, right click on "Libraries" in your project and then "add JAR/Folder..." to select your file(s)

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You can read with something like this :

SerialPort serialPort = new SerialPort("/dev/ttyUSB0");// For windows "COMX" (e.g : "COM1") should works
if (serialPort.openPort()) {
    serialPort.setParams(SerialPort.BAUDRATE_9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_ODD);
    byte[] buffer = serialPort.readBytes(1);// Read one byte
    String str = new String(buffer);
    serialPort.closePort();
}

answered Feb 28, 2015 at 4:28

Duffydake

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4 Comments

Duffydake Over a year ago

I mean your library file(s). For jSSC add "jssc.jar" and then you can use it (import jssc.SerialPort;)

Lasitha Yapa Over a year ago

when i used System.out.println(str) It shows only one letter and stops. What changes do i have to do?

Duffydake Over a year ago

If you know how many bytes you will have replace "1" by your number in readBytes, otherwise you can use "getInputBufferBytesCount".

Lasitha Yapa Over a year ago

Thank u very much I can do what I wanted now.

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