Modbus – IAI America ROBO Cylinder Series User Manual
Page 102
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.