Rexroth IndraLogic L20 and Modbus


Could someone shed some light on how to add a Modbus server to an IndraLogic L20 PLC? I've been trying for a few days, but the documentation is really scarce. Any help will be really appreciated.
Update - I've sourced an IndraControl L20 PLC and installed IndraLogic V1.80 on an XP virtual machine. Can't connect to the PLC which shows BOOT1.02 on the LCD. Can someone explain how at least I can program that PLC as I can't establish a connection to it?