Just stumbled on the "driver" for a serial port scale I wrote in 2005 on the company owner's personal site.

We bought the scale to use in the Shipping department with the custom
shipping software I was working on. The guy I wrote it for apparently
still has it available for clients to re-use. I was pretty proud of it
at the time, with the commented out code for developers who want to test
how it works and the fact that it was my first forray into reading and
writing directly from USB/Serial ports using a thin wrapper around JNI.

The site:
http://www.phizzypup.com/Scale_Software/scaleReader.zip

The guy even saved the e-mail I sent him about it:
http://www.phizzypup.com/Scale_Software/ReJavaAPI.htm