Trent Here. I do those ugly brown pages at rxtx.org. Documentation is not what I do well :) So please help me when you see problems or something is confusing. For more information provided by end users please visit the rxtx wiki at http://rxtx.qbang.org/wiki. This is also where you can help. Short Install Instructions Windows RXTXcomm.jar goes in \jre\lib\ext (under java) rxtxSerial.dll goes in \jre\bin Mac OS X (x86 and ppc) (there is an Installer with the source) RXTXcomm.jar goes in /Library/Java/Extensions librxtxSerial.jnilib goes in /Library/Java/Extensions Run fixperm.sh thats in the directory. Fix perms is in the Mac_OS_X subdirectory. Linux (only x86, x86_64, ia64 here but more in the ToyBox) RXTXcomm.jar goes in /jre/lib/ext (under java) librxtxSerial.so goes in /jre/lib/[machine type] (i386 for instance) Make sure the user is in group lock or uucp so lockfiles work. Solaris (sparc only so far) RXTXcomm.jar goes in /jre/lib/ext (under java) librxtxSerial.so goes in /jre/lib/[machine type] Make sure the user is in group uucp so lockfiles work. A person is added to group lock or uucp by editing /etc/groups. Distributions have various tools but this works: lock:x:54: becomes: lock:x:53:jarvi,taj Now jarvi and taj are in group lock. Also make sure jarvi and taj have read and write permissions on the port. If there are problems please help each other on the wiki and ask questions on the mail-list. User contributed changes will be used here in the next release. If you don't like the documentation, you can improve it. -- Trent Jarvi tjarvi@qbang.org