IAI America ROBO Cylinder Series - Manual (Page 238)

6. Modbus
ASCII
230
Modbus
(4) Sample query
A sample query that reads the special input port (address 9012
H
) of a controller of axis No. 0 is
shown below.
Query: 01 03 90 12 00 01 59 [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’, ‘1’, ‘2’ 39303132
Number of registers [H] ‘0’, ‘0’, ‘0’, ‘1’ 30303031
Error check [H] ‘5’, ‘9’ (in accordance with LRC calculation) 3539
End ‘CR’, ‘LF’ 0D0A
The response to the query is as follows.
Response: 01 03 02 03 00 F7
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] ‘0’, ‘3’, ‘0’, ‘0’ 30333030
Error check [H] ‘F’, ‘7’ (in accordance with LRC calculation) 4637
End ‘CR’, ‘LF’ 0D0A
Note The data of the response example is simply an example and will vary depending on
various conditions.