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
2.1.1
Geometric representation ....................................................................................................7
2.2
Maximum and minimum electrical values in EM21 ...............................................................................7
2.3
Instantaneous variables and meters .....................................................................................................8
2.4
Firmware version and revision code .....................................................................................................8
2.5
Programming lock status.......................................................................................................................8
2.6
Carlo Gavazzi Controls identification code ...........................................................................................9
2.7
Programming parameter tables.............................................................................................................9
2.7.1
Password configuration menu .............................................................................................9
2.7.2
“Application” menu...............................................................................................................9
2.7.3
System configuration menu .................................................................................................9
2.7.4
PT and CT configuration menu............................................................................................9
2.7.5
Pulse output configuration menu .......................................................................................10
2.7.6
Serial port configuration menu...........................................................................................10
2.7.7
Reset commands...............................................................................................................10
2.7.8
Note ...................................................................................................................................10
3
REVISIONS ..................................................................................................................................10
