Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 659

• Query message setting
Message
a Slave address
b Function
c Starting address
d No. of registers
e Byte count
f Data
• 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.
 Example) Write 0.5 s (H05) to 41007 (Pr.7) and 1 s (H0A) to 41008 (Pr.8) of slave address 25
(H19).
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)
• Queries by function codes H03 and H10 are supported. The number and start address of holding registers successfully
accessed by the previous communication are returned. "0" is returned for both the number and start address for queries
other than the function codes above.
• Query message
a. Slave address
H46
(8 bits)
(8 bits)
• Normal response (Response message)
a. Slave address
H46
(8 bits)
(8 bits)
• Query message setting
Message
a Slave address
b Function
• Content of normal response
Message
c Starting address
d No. of points
658
5. PARAMETERS
5.15 (N) Communication operation parameters
Set the address to send messages to. Setting "0" enables broadcast communication.
Set H10.
Set the holding register address from which to start writing the data.
Starting address = start register address (decimal) - 40001
For example, when starting register address 0001 is set, the data of holding register address 40002
is read.
Set the number of holding registers for writing data. Data can be written to up to 125 registers.
The setting range is H02 to HFA (2 to 250). Set twice the value specified by d.
Set the amount of data specified by d. Write data is output Hi bytes first followed by Lo bytes, and
is arranged as follows: data of start address, data of start address+1, data of start address+2, and
so forth.
Starting address No. of registers
H03 HEE H00
(8 bits) (8 bits) (8 bits)
Starting address No. of registers
H03 HEE H00
(8 bits) (8 bits) (8 bits)
b. Function CRC check
L
(8 bits)
b. Function c. Starting address
H
(8 bits)
Set the address to send messages to. Broadcast communication is not possible. (Invalid when "0"
is set.)
Set H46.
The start address of the holding register that was successfully accessed is returned.
Starting address = start register address (decimal) - 40001
For example, when starting address 0001 is returned, the holding register address that was
successfully accessed is 40002.
The number of holding registers that were successfully accessed is returned.
Description
Byte count
H02 H04 H00
(8 bits) (8 bits) (8 bits)
CRC check
H02 H22 H61
(8 bits) (8 bits) (8 bits)
H
(8 bits)
d. No. of points
L H
(8 bits) (8 bits)
Description
Description
Data
H05 H00 H0A
(8 bits) (8 bits) (8 bits)
CRC check
L L
(8 bits) (8 bits)
CRC check
H86 H3D
(8 bits) (8 bits)
H
(8 bits)