Mitsubishi Electric FR-D720 K Series Instruction Manual page 212

Communication operation and setting
 Description of normal response
1) to 4) (including CRC check) of the normal response are the same as those of the query message.
Example: To write 0.5s (H05) to 41007 (Pr. 7) at the slave address 25 (H19) and 1s (H0A) to 41008 (Pr.8).
Query message
Slave
Function
Address
H19 H10
(8 bits) (8 bits)
Normal response (Response message)
Slave
Function
Address
H19 H10
(8 bits) (8 bits)
 Read holding register access log (H46 or 70)
A response can be made to a query made by the function code H03 or H10.
The starting address of the holding registers that succeeded in access during previous communication and the
number of successful registers are returned.
In response to the query for other than the above function code, 0 is returned for the address and number of
registers.
Query message
1) Slave Address
(8 bits)
Normal response (Response message)
1) Slave Address
(8 bits)
 Query message setting
Message
1) Slave Address
2) Function
 Description of normal response
Message
3) Starting Address
4) No. of Points
Example: To read the successful register starting address and successful count from the slave address 25 (H19).
Query message
Slave Address
H19
(8 bits)
Normal response (Response message)
Slave Address
H19
(8 bits)
Success of two registers at starting address 41007 (Pr. 7) is returned.
208
Starting No. of
Address Registers
H03 HEE H00
(8 bits) (8 bits) (8 bits)
Starting No. of
Address Registers
H03 HEE H00
(8 bits) (8 bits) (8 bits)
2) Function CRC Check
H46 L
(8 bits) (8 bits) (8 bits)
2) Function 3) Starting Address
H46 H
(8 bits) (8 bits)
Address to which the message will be sent
Broadcast communication cannot be made (0 is invalid).
Set H46.
The starting address of the holding registers that succeeded in access is returned.
Starting address = Starting register address (decimal)-40001
For example, when the starting address 0001 is returned, the address of the
holding register that succeeded in access is 40002.
The number of holding registers that succeeded in access is returned.
Function CRC Check
H46 H8B HD2
(8 bits) (8 bits) (8 bits)
Function Starting Address
H10 H03
(8 bits) (8 bits)
Byte
Count
H02 H04 H00
(8 bits) (8 bits) (8 bits)
CRC Check
H02 H22 H61
(8 bits) (8 bits) (8 bits)
H
4) No. of Points
L H L
(8 bits) (8 bits) (8 bits)
Setting Description
Setting Description
No. of Points
HEE H00 H02
(8 bits) (8 bits) (8 bits)
Data
H05 H00 H0A H86
(8 bits) (8 bits) (8 bits) (8 bits)
CRC Check
L H
(8 bits) (8 bits)
CRC Check
H22 H61
(8 bits) (8 bits)
CRC Check
H3D
(8 bits)