IAI America ROBO Cylinder Series - Manual (Page 110)

5. Modbus RTU
102
Modbus
(4) Query sample
A sample query that reads the deviation monitor (from address 900E
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 0E 00 02 88 C8
Field RTU mode
8-bit data
Start Silent interval
Slave address [H] 01
Function code [H] 03
Start address [H] 900E
Number of registers [H] 0002
Error check [H] 88C8 (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 04 00 00 00 0B BB F4
Field RTU mode
8-bit data
Start Silent interval
Slave address [H] 01
Function code [H] 03
Number of data bytes [H] 04 (4 bytes = 2 registers)
Data 1 [H] 00 00 00 0B
Error check [H] BBF4 (in accordance with CRC calculation)
End Silent interval
The deviation monitor is “0000000B” o Convert into decimal number o 11
The deviation over a 1-ms period between the position command value and the feedback
value (actual position) is 11 pulses.
Note The data of the response example is simply an example and will vary depending on
various conditions.