Chronomotion Website: http://www.apertus.org/en/chronomotion
There are 3 different packages available for download: Linux, Mac and Windows
The Windows archive is the only one containing a bundled JRE and libraries for convenience. Mac and Linux users are expected to be capable of installing JRE and libraries on their own.
Mac and Linux users need a JRE and RXTX library installed the use Chronomotion. Check the Chronomotion Installation Guide.
First select a COM port (they are discovered automatically so most likely you will only have COM1 anyway) and press the "Connect" Button.
You should see Serial commands being sent and received in Terminal. This means everything connected properly and you can use all other buttons/commands.