GT200 series general purpose inverter instruction manual
Frame
Head
Address
Function
Code
Register
Address
Write
Content
LRC
Check
Frame
End
Character
:
0
1
0
6
0
0
0
2
0 F A 0
4
8 CR LF
ASCII
3A
30 31
30
36 30 30 30 32 30 46 41 30 34 38 0D 0A
The inverter, via function code, could set different response delays to adapt to detailed
application needs of various master station, for RTU mode, actual response delay is not less
than an interval of 3.5 characters, for ASCII mode, actual response delay is not less than 1ms.
Protocol function
The most important function of Modbus is to read and write parameters, and different
function codes decide different operation requests. Inverter Modbus protocol supports the
following function code operations:
Function
Code
Function Code Significance
0x03
Read inverter function code parameters and run state parameters.
0x06
Modify single inverter function code or control parameter, and do not
save after power off.
0x08
Wire diagnosis
0x10
Modify multiple inverter function codes or control parameters, and do
not save after power off.
0x41
Modify single inverter function code or control parameter, and do not
save after power off.
0x42
Function code management
Inverter’s function code parameters, control parameters and state parameters are all
mapped to Modbus read/write register. Read/Write characteristics and range of function code
parameters all comply with instructions in the inverter’s user manual. Inverter function code’s
group number is mapped to high byte address of the register, while group index is mapped to
low byte address of the register. Inverter’s control parameters are virtualized to inverter
function code group 50, while inverter’s state parameters are virtualized to inverter function
code group 51.The correspondence between function code group number and its mapped
register address high byte is as follows:
Group F0: 0x00; group F1: 0x01; group F2: 0x02; group F3: 0x03; group F4: 0x04; group
F5: 0x05; group F6: 0x06; group F7: 0x07; group F8: 0x08; group F9: 0x09; group FA: 0x0A;
group Fb: 0x0B; group FC: 0x0C; group Fd: 0x0D; group FE: 0x0E; inverter control
parameter group: 0x32; inverter state parameter group: 0x33.
For example, register address of inverter function code parameter F3.02 is F3.02, and
register address of inverter function code parameter FE.01 is 0xE01.
The overall data frame’s format has been introduced in the above, format and significance
of Modbus protocol’s function code and data part will be introduced in the following, which
is the content of “function code” and “data” parts in the above mentioned data frame format.
89
