Modbus – IAI America ROBO Cylinder Series User Manual
Page 100
5. Modbus RTU
92
Modbus
(4) Query sample
A sample query that reads the device status (address 9006
H
) of a controller with axis No. 0
is shown below.
z
Query (silent intervals are inserted before and after the query)
01 03 90 06 00 01 49 0B
Field
RTU mode
8-bit data
Start
Silent interval
Slave address [H]
01
Function code [H]
03
Start address [H]
9006
Number of registers [H] 0001
Error check [H]
490B (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 80 00 D9 84
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]
80 00
Error check [H]
D984 (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.