Instruction Manual

5. Modbus RTU

129

Modbus

(4) Query sample

A sample query that moves the actuator of a controller of axis No. 0 to the position specified by

the position number stored in the position number specification register (POSR: 0D03

) is shown

below.

Query (silent intervals are inserted before and after the query)

First time 01 05 04 0C FF 00 4D 09 --- Move to the specified position

Second time 01 05 04 0C 00 00 0C F9 --- Restore to the normal status

Field RTU mode

8-bit data

Start Silent interval

Slave address [H] 01

Function code [H] 05

Start address [H] 040C

Changed data [H] First time: FF00

Second time: 0000

(Restore to the normal status.)

Error check [H] First time: 4D09

(in accordance with CRC calculation)

Second time: 0CF9

(in accordance with CRC calculation)

End Silent interval

If the change is successful, the response message will be the same as the query.