Serial port doesn't send data?

I have a TiniTutor board from Taylec. The problem that I have is that I can not
write data aaon serial port, although the program is working and writting
correctly in the serial port outputstream:

public SerialPort sp;
public OutputStream sout;
sout=sp.getOutputStream();
...
sout.write(a);	
System.out.print(a);


I am monitoring the serial port in order to see if it is sending anything, but I
can not detect anything, althoug System.out.prinln(a) shows the bytes that are
supposed to be sent.
Do you know about some software that monitore the serial port?

Thanks a lot for your help!
-- 

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