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Usage of Serial Com Port communication

Discussion in 'Java' started by calvinlyp, Feb 20, 2010.

  1. calvinlyp

    calvinlyp New Member

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    Hi all,

    currently i am trying to use a java app to read from my usb to serial port on my PC.

    i research and found that Windows COM ports are not directly supported by Sun anymore. thus there is another package called rxtx.

    http://www.captain.at/howto-java-ser...-comm-rxtx.php
    i tried the above link with my app, however it return me portId=null;

    from the link below:(New Windows Java Serial Com Port driver with proper handling of Timeouts)
    http://www.engidea.com/blog/informat...m/winjcom.html

    it stated that the usb to serial maybe a problem when using the rxtx package, and this winjcom maybe a good substitute.

    however, is there any expertises can share their advice on how to use this winjcom.

    thanks in advance.
    any help will be greatly appreaciated.
     
  2. shabbir

    shabbir Administrator Staff Member

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    Moved your attachment into the post
     
  3. ewaldhorn

    ewaldhorn New Member

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    Hi.

    I've had mixed success with using COM ports on Windows through Java. What I'd recommend is that you find a good C/C++ DLL you can use and then using JNI (Java Native Interface) to call it and do what you need to do.

    Could you explain the USB to COM thing though? Do you want to read directly from the USB device or treat it like a COM port?

    Thanks
    Ewald
     

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