Data Sheet

Index
1.1 Introduction ........................................................................................................................................... 3
1.2 MODBUS functions ............................................................................................................................... 3
1.2.1 Function 03h (Read Holding Registers) .............................................................................. 3
1.2.2 Function 04h (Read Input Registers) .................................................................................. 4
1.2.3 Function 06h (Write Single Holding Register) ..................................................................... 4
1.2.4 Function 08h (Diagnostic with sub-function code 00h) ........................................................ 5
1.2.5 Broadcast mode .................................................................................................................. 5
1.3 Application notes ................................................................................................................................... 6
1.3.1 RS485 general considerations ............................................................................................ 6
1.3.2 MODBUS timing .................................................................................................................. 6
2 TABLES ......................................................................................................................................... 7
2.1 Data format representation In Carlo Gavazzi instruments .................................................................... 7
2.2 Geometric representation ...................................................................................................................... 7
2.3 Maximum and minimum electrical values in GNM3 SERIES .............................................................. 8
2.4 Instantaneous variables and meters (grouped by variable type) .......................................................... 9
Instantaneous variables and meters (grouped by phase) ................................................................................... 10
2.5 Firmware version and revision code ................................................................................................... 11
2.6 GARO identification code .................................................................................................................... 11
2.7 Programming parameter tables ........................................................................................................... 11
2.7.1 Password configuration menu ........................................................................................... 11
2.7.2 System configuration menu ............................................................................................... 11
2.7.3 PT and CT configuration menu .......................................................................................... 11
2.7.4 Dmd and pulse outs configuration menu ........................................................................... 11
2.7.5 Other functions configuration menu................................................................................... 12
2.7.6 Active tariff selection .......................................................................................................... 12
2.7.7 Serial port configuration menu ........................................................................................... 12
2.7.8 Reset commands............................................................................................................... 13
2.7.9 Serial number .................................................................................................................... 13
2.7.10 Note ................................................................................................................................... 13