V&T E5 Series, User Manual

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E5 Series High Performance Universal Inverter User’s Manual
Appendix A Modbus Communication Protocol 135
Abnormal codes:
Abnormal
code
Definition
Abnormal
code
Definition
0x0T Illegal command 0xT0
Frame error: frame length error, check sum
error
0x0T Illegal data address 0xTT Parameters are unchangeable
0x03
Illegal data, data beyond upper limit or
lower limit
0xTT
Parameter is unchangeable in running
status
0x04
Slave operation failure, the data is in
the normal range, but it is invalid
0xT3 The parameter is protected by password
0x05
Command is valid, and is in process,
mainly occurs when storing data into
EEPROM
0xT4
Run command source is not through
communication, Communication command
is not useful
0x06
Slave is busy, mainly occurs when
storing data into EEPROM
4. Function Interpretation

Function 0x03 reads multiple parameters and status words
PDU Part Contents Data Length (Byte) Range
Request:
Function code
T 0x03
Start address of register T 0x0000 ~ 0xFFFF
Number of registers T 0x000T ~ 0x00T0
Response:
Function code
T 0x03
Read bytes T T*Number of registers
Read contents T*Number of registers

Function 0x06(0x4T) write single parameter
PDU Part Contents Data Length (Byte) Range
Request:
Function code
T 0x06(0x4T)
Register address T 0x0000 ~ 0xFFFF
Register data T 0x0000 ~ 0xFFFF
Response:
Function code
T 0x06(0x4T)
Register address T 0x0000~ 0xFFFF
Register data T 0x0000 ~ 0xFFFF

Function 0xT0(0x4T) write multiple parameters
PDU Part Contents Data Length (Byte) Range
Request:
Function code
T 0xT0(0x4T)
Start address of register T 0x0000~0xFFFF
Number of register T 0x000T~0x00T0
Bytes of register contents T T*Number of registers
Register contents T*Number of registers
Response:
Function code
T 0xT0(0x4T)
Start address of register T 0x0000~0xFFFF
Number of register T 0x000T~0x00T00