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Communication operation and setting
(5) Message format types
The message formats corresponding to the function codes in Table 1 on page 209 will be explained.
Read holding register data (H03 or 03)
Can read the description of 1) system environment variables, 2) real-time monitor, 3) faults history, and 4)
inverter parameters assigned to the holding register area (refer to the register list (page 215)).
Query Message
1) Slave Address
(8bit)
Response message
1) Slave Address
(8bit)
Query message setting
Message
1)Slave Address
2) Function
3)Starting Address
4)No. of Points
Description of normal response
Message
5)Byte Count
6)Data
Example) To read the register values of 41004 (Pr. 4) to 41006 (Pr. 6) from the slave address 17 (H11)
Query message
Slave Address Function
H11
(8bit)
Normal response (Response message)
Slave Address Function Byte Count
H11
(8bit)
Read value
Register 41004 (Pr. 4): H1770 (60.00Hz)
Register 41005 (Pr. 5): H0BB8 (30.00Hz)
Register 41006 (Pr. 6): H03E8 (10.00Hz)
210
2) Function
3) Starting Address
H03
H
(8bit)
(8bit)
2) Function
5) Byte Count
H03
(8bit)
(8bit)
Set the address to which the message will be sent. Broadcast
communication cannot be made (0 is invalid)
Set H03.
Set the address at which holding register data read will be started.
Starting address = starting register address (decimal)
For example, setting of the starting address 0001 reads the data of the
holding register 40002.
Set the number of holding registers from which data will be read. The
number of registers from which data can be read is a maximum of 125.
The setting range is H02 to H14 (2 to 20).
Twice greater than the No. of Points specified at 4) is set.
The number of data specified at 4) is set. Data are read in order of Hi byte
and Lo byte, and set in order of starting address data, starting address + 1
data, starting address + 2 data, ...
Starting Address
H03
H03
(8bit)
(8bit)
H03
H06
H17
(8bit)
(8bit)
(8bit)
4) No. of Points
L
H
L
(8bit)
(8bit)
(8bit)
6) Data
H
L
(8bit)
(8bit)
Setting Description
Setting Description
No. of Points
HEB
H00
(8bit)
(8bit)
Data
H70
H0B
HB8
(8bit)
(8bit)
(8bit)
CRC Check
L
H
(8bit)
(8bit)
CRC Check
...
L
(n
16bit)
(8bit)
(8bit)
40001
CRC Check
H03
H77
(8bit)
(8bit)
CRC Check
H03
HE8
H2C
(8bit)
(8bit)
(8bit)
H
H2B
(8bit)
HE6
(8bit)

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