IACDRIVE I5000 Series Operation Manual page 117

The above shows the format of the frame. Now we will introduce the Modbus command and
data structure in details, which is called protocol data unit for simplicity. Also MSB stands for
the most significant byte and LSB stands for the least significant byte for the same reason.
The description below is data format in RTU mode. The length of data unit in ASCII mode
should be doubled.
Protocol data unit format of reading parameters:
Request format:
Protocol data unit
Command
Data Address
Read number
Reply format (success):
Protocol data unit
Command
Returned byte number
Content
If the command is reading the type of inverter (data address 0x3016), the content value in
reply message is the device code:
The high 8 bit of device code is the type of the inverter, and the low 8 bit of device code is the
sub type of inverter.
For details, please refer to the following table:
High byte
00
01
Data length(bytes)
1
2
2
Data length(bytes)
1
2
2* Read number
Meaning
I5000
I5000
Range
0x03
0~0xFFFF
0x0001~0x0010
Range
0x03
2* Read number
Low byte
01
02
03
04
01
02
115
Meaning
Universal type
For water supply
Middle frequency
1500HZ
Middle frequency
I5000HZ
Universal type
Middle frequency