Mitsubishi Electric MR-JE-_A Instruction Manual page 30

3. MODBUS PROTOCOL
(2) Usage example
The following shows a setting example of when the function diagnostics of the slave address "03h" is
executed.
Query Message
Slave Address Function
03h 08h
Set the following values to each Query Message.
Message
Slave Address
Function
Sub Function
Data
CRC Check
Response Message
Slave Address Function
03h 08h
The following shows the information in each Response Message.
Message
Slave Address
Function
Sub Function
Data
CRC Check
Sub Function
H L
00h 00h
Set the station number "03h".
Set "08h".
Set "0000h".
When setting 1234h, set values as follows:
H: "12h"
L: "34h"
Data for CRC error check
This data is calculated automatically by a controller.
Sub Function
H L
00h 00h
The station number "03h" is returned.
The value "08h" is returned. This means that the message was received without errors.
The value "0000h" is returned.
The value "1234h" set in the Query Message is returned.
H: "12h"
L: "34h"
Data for CRC error check
This data is calculated automatically by a servo amplifier, and the result of the calculation is
returned.
3 - 7
Data
H L
12h 34h
Description
Data
H L
12h 34h
Description
CRC Check
L H
(8 bits) (8 bits)
CRC Check
L H
(8 bits) (8 bits)