Specifying devices in the javax.comm.properties file

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Specifying devices in the javax.comm.properties file

Use the javax.comm.properties file to specify the devices and drivers that are available to the Java™ Communications API and whether they are parallel or serial. Do not change this file without a very clear understanding of its use.
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The following properties must be defined:

driver=<driver_name>
serpath0=<serial_port_device>
parpath0=<parallel_port_device>

For example:

# Implementation specific driver
driver=com.sun.comm.LinuxDriver

# Paths to server-side serial port devices
serpath0 = /dev/ttyS0
serpath1 = /dev/ttyS1

# Paths to server-side parallel port devices
parpath0 = /dev/parport0
parpath1 = /dev/parport1

For parallel port access, use /dev/parport<n>. /dev/lp<n> is not supported in Javacomm version 3.

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For more detail try this

publib.boulder.ibm.com/infocenter/javasdk/v6r0/index.jsp?topic=/com.ibm.java.doc.user.lnx.60/user/javacomm_lnx_devices.html