Sorry for the late reply. The monitoring seems to have ceased to work with all the updates they made to the site over the last months.
If you would like to use overlapping memory sections, then what you may do is implement corresponding classes that are both, DigitalIn and DigitalOut (i.e. a coil if you want). You may then register instances to the map in the locations you need; I think that...
2009-09-22 23:26:08 UTC in Java Modbus Library