Mitsubishi Electric 800 Series Instruction Manual page 147

Normal response (Response message)
Slave address
H11
(8 bits)
Read value
Register 41004 (Pr.4): H1770 (60.00 Hz)
Register 41005 (Pr.5): H0BB8 (30.00 Hz)
Register 41006 (Pr.6): H03E8 (10.00 Hz)
 Write single register (writing data to holding registers) (H06 or 06)
• The content of the system environmental variables and inverter parameters (refer to
register area can be written.
• Query message
a. Slave address
(8 bits)
• Normal response (Response message)
a. Slave address
(8 bits)
• Query message setting
Message
a Slave address
b Function code
c Register address
d Register value
• Content of normal response
The contents in the normal response (a to d, including the CRC check) are the same as those in the query messages.
In the case of broadcast communication, no response is returned.
 Example) Write 60 Hz (H1770) to 40014 (set frequency RAM) of slave address 5 (H05).
Query message
Slave address
H05
(8 bits)
Normal response (Response message)
The same data as those in the query message
NOTE
• With broadcast communication, no response is generated even if a query is executed, so when the next query is made, it must
be made after waiting for the inverter data processing time after the previous query is executed.
 Diagnostics (diagnosis of functions) (H08 or 08)
• A communication check can be made since the query message is sent and the query message is returned as it is as the
return message (subfunction code H00 function). Subfunction code H00 (Return query data)
• Query message
a. Slave address
(8 bits)
146
3. RS-485 Communication
3.5 MODBUS RTU
Function code Byte count
H03 H06
(8 bits) (8 bits)
b. Function
c. Register address
code
H06 H
(8 bits) (8 bits)
b. Function
c. Register address
code
H06 H
(8 bits) (8 bits)
Set the address to send messages to. Setting "0" enables broadcast communication.
Set H06.
Set the holding register address to write data to.
Register address = holding register address (decimal) - 40001
For example, when register address 0001 is set, data is written to holding register address 40002.
Set the data to write to the holding register. Write data is fixed at 2 bytes.
Function code Register address
H06 H00
(8 bits) (8 bits)
b. Function
c. Sub-function
code
H08 H00
(8 bits) (8 bits)
Register value
H17 H70 H0B HB8
(8 bits) (8 bits) (8 bits) (8 bits)
d. Register value
L H
(8 bits) (8 bits)
d. Register value
L H
(8 bits) (8 bits)
Description
Register value
H0D H17
(8 bits) (8 bits)
d. Data
H00 H
(8 bits) (8 bits)
H03 HE8 H2C
(8 bits) (8 bits) (8 bits)
page 149) assigned to the holding
CRC check
L L
(8 bits) (8 bits)
CRC check
L L
(8 bits) (8 bits)
CRC check
H70 H17
(8 bits) (8 bits)
CRC check
L L
(8 bits) (8 bits)
CRC check
HE6
(8 bits)
H
(8 bits)
H
(8 bits)
H99
(8 bits)
H
(8 bits)