The RXTX library handles finding the list of available serial ports. The serial port names for Windows are normally COM1, COM2, etc. The serial port names for Mac and Linux are normally /dev/ttyS0, /dev/ttyS1, etc. If the serial port name is not typical it will not be included in the serial port list.

The serial port names may be manually registered with the RXTX library by setting the gnu.io.rxtx.SerialPorts environment variable. Multiple values may be specified separated with a colon. For example:

java -Dgnu.io.rxtx.SerialPorts=/dev/ttyS0:/dev/ttyS1 -Xmx1024m -jar jAmaseis.jar