Pues debería funcionarte.
Los pasos para instalarlo, están explicados en el readme.html:
Unzip the file javacomm20-win32.zip. This will produce a hierarchy with a top level directory commapi.
The examples in this document assume that you have unzipped the javacomm20-win32.zip file in your C: partition and your JDK installation is in C:\jdk1.1.6. If you have installed JDK in an other location or unzipped javacomm20-win32.zip in an other location modify the example commands appropriately.
If you are installing the Java communications API into a JRE (Java runtime environment) follow the same instructions as for the JDK except where noted. See the additional instructions for running using the JRE.
Copy win32com.dll to your <JDK>\bin directory.
C:\>copy c:\commapi\win32com.dll to c:\jdk1.1.6\bin
Copy comm.jar to your <JDK>\lib directory.
C:\>copy c:\commapi\comm.jar c:\jdk1.1.6\lib
Copy javax.comm.properties to your <JDK>\lib directory.
C:\>copy c:\commapi\javax.comm.properties c:\jdk1.1.6\lib
The javax.comm.properties file must be installed. If it is not, no ports will be found by the system.
Add comm.jar to your classpath (do not do this step for a JRE installation).
If you don't have a classpath defined:
If you already have a classpath defined:
Several serial port sample applications are provided with this release. One of them is BlackBox. To run BlackBox, first add BlackBox.jar to your classpath:
Now you can run BlackBox:
One sample driver, NullDriver, is included in the samples\NullDriver directory. This is useful for folks attempting to write a new driver for their own hardware.