106
F0 Group
:
0x00
;
F1 Group
:
0x01
;
F2 Group
:
0x02
;
F3 Group
:
0x03
;
F4 Group
:
0x04
;
F5 Group
:
0x05
;
F6 Group
:
0x06
;
F7 Group
:
0x07
;
F8 Group
:
0x08
;
F9 Group
:
0x09
;
FA Group
:
0x0A
;
FB Group
:
0x0B
;
FC Group
:
0x0C
;
FD Group
:
0x0D
;
FE Group
:
0x0E
;
FL Group
:
0x11
;
FN Group
:
0x12
;
FP Group
:
0x13
;
FU Group
:
0x14
;
Inverter
control parameters Group
:
0x32
;
Inverter state parameter Group
:
0x33
。
E.g. the inverter function code parameter F3.02 maps to register address
0x302. The function code parameter FB.01 maps to the register address
0xB01.
As already described the formatting of an entire data frame, the
following will focus on the Modbus protocol function codes and the
format and meaning of the data. It refers to the content of "function
code" and "Data" section in the data frame format. The two parts
compose a Modbus application layer protocol data unit. The
application-layer protocol data unit mentioned below refers to these two
parts.
The application layer protocol data unit for reading inverter parameters
is as follows:
Application layer
protocol Data Unit
Data length
(
number of
bytes
)
Values or range
Function code
1
0x03
Initial register address
2
0x0000~0xFFFF
Register number
2
0x0001~0x0004
Response format as below
:
Application layer
protocol Data Unit
Data length
(
number of
bytes
)
Values or range
Function code
1
0x03
Read number of bytes
1
2* Register number
Read content
2* Register
number
If the operation fails, error code and exception code will be responded.