GE 760

4 - 66 750/760 FEEDER MANAGEMENT RELAY – COMMUNICATIONS GUIDE
DATA FORMATS NOTES CHAPTER 4: MODBUS MEMORY MAP
13. The ADDR 000C register, Installed Option: Harsh Environment, has changed for version
7.43 in relays manufactured after February 2014.
With earlier firmware or manufacture date, ADDR 000C always reads as value 0.