Parameter Description
Parameter Description
68
1) Deduct 100 from 195 and get 95.
1) The minimum unit of P.195 is 0.01, therefore the
Convert 95 to hexadecimal H5F.
product of 50 and 100 is 5000.
Add H5F to H80 and get HDF. 2) Convert 5000 to hexadecimal H1388. Convert 1, 3,
8, 8 to ASCII CODE before data transmission.
Step 4. The inverter responds to the computer using format C after receiving and processing the data.
ACK
Station Number
0
CR
H06
H30 H30
H0D
Example 5.
Change the value of P.195 to 500 (parameter range 0~400):
Step1 and step 2 of Example 5 are similar to Step1 and Step2 of Example 3.
Step 3. The computer requests the inverter to enter 500 into P.195 via format A:
ENQ
Station Number
0
Command Code
HDF
Waiting Time
Data
HC350
Sum Check
CR
H05
H30 H30
H44 H46
H30
H43 H33 H35 H30
H46 H35
H0D
Step 4. After processing, the inverter will send feedbacks about the out of range data (i.e., incorrect
data) to the computer via format D:
NAK
Station Number
0
Error Code
H0C
CR
H15
H30 H30
H43
H0D
2. Modbus protocol
1). Information form
● Modbus serial transmission can be divided into two kinds: ASCII (American Standard Code for
Information Interchange) and RTU (Remote Terminal Unit) modes.
(1). Query
The computer (primary address) sends a message to the inverter (from the address) with the
specified address.
