[svlug] Problem with Java and Multi-port serial port

Sumit rsumit_2001 at yahoo.co.in
Fri Jul 25 15:49:27 PDT 2003

 --- "Justin F. Knotzke" <jknotzke at shampoo.ca> wrote:
>    It appears that even with Java 1.4 you need rxtx
> (the 3rd party
> package I told you about).
> http://wass.homelinux.net/howtos/Comm_How-To.shtml
I am using Sun Java 1.4 and I am using the rxtx
package, exactly the one described in the above link.

The problem is things work fine with /dev/ttyS0 but
gives problem with /dev/ttyR0(one of the multiport
serial port). 

The code also have a function as follows to find all
the available ports. This function prints only
/dev/ttyS0 and /dev/lp0 as the available ports 

   public void PrintAllPorts( )
        Enumeration ports =

        if (ports == null) {
          sf.VERBOSE("No comm ports found!" );

        // print out all ports
        sf.VERBOSE( "printing all ports..." );
        while ( ports.hasMoreElements() )
          sf.VERBOSE( "-  " +
((CommPortIdentifier)ports.nextElement()).getName() );



The essence of knowledge is, having it, to apply it; not having it, to confess your ignorance.
         Confucius BC 551-479, Chinese Ethical Teacher, Philosopher

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