Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 657

• Query message setting
Message
a Slave address
b Function
c Starting address
d No. of points
• Content of normal response
Message
e Byte count
f Data
 Example) Read the register values of 41004 (Pr.4) to 41006 (Pr.6) from slave address 17 (H11).
Query message
Slave address
H11
(8 bits)
Normal response (Response message)
Slave address Function
H11 H03
(8 bits) (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)
 Preset 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
c Register address
d Preset 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.
In the case of broadcast communication, no response is returned.
656
5. PARAMETERS
5.15 (N) Communication operation parameters
Set the address to send messages to. Broadcast communication is not possible. (Invalid when "0"
is set.)
Set H03.
Set the holding register address from which to start reading 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 reading data. Data can be read from up to 125 registers.
The setting range is H02 to HFA (2 to 250).
Twice the number of reads specified by (d) is set.
The amount of data specified by (d) is set. Read 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.
Function Starting address
H03 H03
(8 bits) (8 bits)
Byte count
H06 H17
(8 bits) (8 bits)
b. Function c. Register address
H06 H
(8 bits) (8 bits)
b. Function c. Register address
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.
Description
Description
No. of points
HEB H00
(8 bits) (8 bits)
Data
H70 H0B HB8
(8 bits) (8 bits) (8 bits)
d. Preset data
L H
(8 bits) (8 bits)
d. Preset data
L H
(8 bits) (8 bits)
Description
CRC check
H03 H77
(8 bits) (8 bits)
CRC check
H03 HE8 H2C
(8 bits) (8 bits) (8 bits)
page 660) assigned to the holding
CRC check
L L
(8 bits) (8 bits)
CRC check
L L
(8 bits) (8 bits)
H2B
(8 bits)
HE6
(8 bits)
H
(8 bits)
H
(8 bits)