CARLO GAVAZZI EM 21 Communication Protocol Manual Download Page 1 | Manualshive

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EM21

COMMUNICATION

PROTOCOL

Version 1 Revision 0

April 7

th

, 2008

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Summary of Contents for EM 21

Page 1: ...EM21 COMMUNICATION PROTOCOL Version 1 Revision 0 April 7th 2008...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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