Reading data from Serial port

Question

I have a requirement where i have to read data streams coming on serial port. I am using javax.comm API for same.

When I try to list ports, using below code I never get any port list.

portList = CommPortIdentifier.getPortIdentifiers();
System.out.println("start: "+portList.hasMoreElements());

It returns false.

Can anyone help me if I am missing anything?

My PS2 port didn't came in list. Is there any other way to list PS2 port??

My full code is as below,

    while (portList.hasMoreElements()) {
       portId = (CommPortIdentifier) portList.nextElement();
       System.out.println("portid: "+portId.getName());
    }

output

portid: COM1
portid: COM3
portid: LPT1

My actual requirement is to read data on USB port. I was facing issues using JUSB and it didn't work. So I decided to get serial to USb converter and read on serial port. But, there is no such convertable available in market.

Now, thinking of another work around I was able to get a PS2 to usb converter. It would be great if you could help me listing PS2 port using Java and read/write to it or suggest some API for same on windows platform.

Any help in this regard is highly appreciated.

which javax.comm library you are using and what is your system? I am using rxtx and it works well. — Salil, Jun 29 '12 at 08:07
I am also using rxtx and it worked for me too. The thing missing was configuration in eclipse related to .dll file as explained in link below, http://www.intellog.com/blog/?p=255 — Mayank, Jun 29 '12 at 08:35

score 2 · Answer 1 · answered Jun 29 '12 at 07:56

Take a look at RXTX. Then you can use something like that:

 CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier("/dev/tty1");
 CommPort commPort = portIdentifier.open("owner-name", 2000);
 SerialPort serialport;
 if (commPort instanceof SerialPort) {
   serialPort = (SerialPort)commPort;
   serialPort.setSerialPortParams(rate, databits, stopbits, parity);
 }
 InputStream in = serialPort.getInputStream();
 OutputStream out = serialPort.getOutputStream();

Thanks Ortang. I am able to list my serial port now. – Mayank Jun 29 '12 at 08:40 — Mayank, Jun 29 '12 at 08:40

score 0 · Accepted Answer · answered Jun 29 '12 at 07:30

0

Please see: http://www.intellog.com/blog/?p=255 and http://www.coderanch.com/t/535173/Streams/java/CommPortIdentifier-getPortIdentifiers-empty (the latter points to the first)

Oracle does not offer the binaries for windows (assuming that you're on windows): http://www.oracle.com/technetwork/java/index-jsp-141752.html

answered Jun 29 '12 at 07:30

heikkim

2,955
2
24
34

Thanks for useful link, it worked. I am able to list ports connected to my System. – Mayank Jun 29 '12 at 07:49

score 0 · Answer 3 · edited May 23 '17 at 11:49

0

I'm using ubuntu and my computer does not have any serial/pararel port but I need to develop on it.

You need to simulate this ports in this case.

My answer:

serial port identification with java on ubuntu

edited May 23 '17 at 11:49

Community

1
1

answered Feb 05 '14 at 03:29

Marcelo Amorim

1,662
23
23

Reading data from Serial port

3 Answers3