IAI America ROBO Cylinder Series - Manual (Page 214)

6. Modbus
ASCII
206
Modbus
(4) Sample query (Axis No. 0)
A sample query that reads input ports (address 9003
H
) in a controller of axis No. 0 is shown below.
Query: 01 03 90 03 00 01 68 [CR] [LF]
Field ASCII mode
fixed character string
Converted ASCII
code data [H]
Start ‘:’ 3A
Slave address [H] ‘0’, ‘1’ 3031
Function code [H] ‘0’, ‘3’ 3033
Start address [H] ‘9’, ‘0’, ‘0’, ‘3’ 39303033
Number of registers [H] ‘0’, ‘0’, ‘0’, ‘1’ 30303031
Error check [H] ‘6’, ‘8’ (In accordance with LRC calculation)’ 3638
End ‘CR’, ‘LF’ 0D0A
The response to the query is as follows.
Response: 01 03 02 B8 01 14 [CR] [LF]
Field ASCII mode
fixed character string
Converted ASCII
code data [H]
Start ‘:’ 3A
Slave address [H] ‘0’, ‘1’ 3031
Function code [H] ‘0’, ‘3’ 3033
Number of data bytes [H] ‘0’, ‘2’ (2 bytes = 1 register) 3032
Data 1 [H] ‘B’, ‘8’, ‘0’, ‘1’ 42383031
Error check [H] ‘1’, ‘4’ (in accordance with LRC calculation) 3134
End ‘CR’, ‘LF’ 0D0A
The input port data area is “B801”
H
o Convert into binary number “1011100000000001”
Note The data of the response example is simply an example and will vary depending on various
conditions.