Instruction Manual

5. Modbus RTU
94
Modbus
(4) Query sample
A sample query that reads the expansion device status (address 9007
H
) of a controller of axis No.
0 is shown below.
z Query (silent intervals are inserted before and after the query)
01 03 90 07 00 01 18 CB
Field RTU mode
8-bit data
Start Silent interval
Slave address [H] 01
Function code [H] 03
Start address [H] 9007
Number of registers [H] 0001
Error check [H] 18CB (in accordance with
CRC calculation)
End Silent interval
The response to the query is as follows.
z Response (silent intervals are inserted before and after the response)
01 03 02 33 C7 ED 26
Field RTU mode
8-bit data
Start Silent interval
Slave address [H] 01
Function code [H] 03
Number of data bytes [H] 02 (2 bytes = 1 register)
Data 1 [H] 33 C7
Error check [H]
ED26 (in accordance with CRC calculation)
End Silent interval
Note The data of the response example is simply an example and will vary depending on
various conditions.