Firmware 5.2 was developed to be 100% compliant with the ODVA specification for Ethernet I/P. In generating this firmware, we found that the numbering system we used to identify our Ethernet I/P assembly instances encroached on reserved values in the ODVA specification. In order for Firmware 5.2 to be ODVA compliant requires that our previous assembly instance identification numbers be reassigned. In so doing, this also had an effect on our Modbus addressing for the contiguous blocks of registers used for accessing assembled data over Modbus TCP