EM21
COMMUNICATION
PROTOCOL
Version 1 Revision 0
April 7
th
, 2008
Страница 1: ...EM21 COMMUNICATION PROTOCOL Version 1 Revision 0 April 7th 2008...
Страница 2: ...tation 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 co...
Страница 3: ...d in the communication frame 2 The functions 03h and 04h have exactly the same effect and can be used indifferently 3 The communication parameters are to be set according to the configuration of the i...
Страница 4: ...1 to 11 Byte order MSB LSB CRC 2 bytes Response frame correct action Description Length Value Note Physical address 1 byte 1 to F7h 1 to 247 Function code 1 byte 04h Quantity of requested bytes 1 byt...
Страница 5: ...sage should be identical to the request Request frame Description Length Value Note Physical address 1 byte 1 to F7h 1 to 247 Function code 1 byte 08h Sub function 2 bytes 0000h Data N word N 2 bytes...
Страница 6: ...connection it is suggested to use an AWG24 balanced pair cable and to add a third wire for GND connection Connect GND to the shield if a shielded cable is used 5 The GND is to be connected to ground...
Страница 7: ...rmats the word order is LSW MSW 2 1 1 Geometric representation According to the signs of the power factor the active power P and the reactive power Q it is possible to obtain a geometric representatio...
Страница 8: ...2 Value weight var 10 300047 002Eh 1 PF L1 INT16 300048 002Fh 1 PF L2 INT16 300049 0030h 1 PF L3 INT16 300050 0031h 1 PF INT16 Negative values correspond to lead C positive value correspond to lag L V...
Страница 9: ...ue 999d 2 7 2 Application menu MODBUS read and write mode Table 2 7 2 Modicom address Physical address Length words VARIABLE ENG UNIT Data Format Notes 304098 1001h 1 Type of application UINT 16 Value...
Страница 10: ...t address UINT 16 Value min 1 Value max 247 Note The number of stop bits is fixed to 1 and the parity control is fixed to none 2 7 7 Reset commands MODBUS write only mode Table 2 7 12 Modicom address...
