Instruction Manual

6. Modbus ASCII
189
Modbus
(5) Sample query
A sample query that reads addresses 9000
H
to 9009
H
in a RC controller of axis No. 0 is shown
below:
Query: 01039000000A62 [CR][LF]
Field ASCII mode
fixed character string
Converted ASCII code
data [H]
Header ‘:’ 3A
Slave address [H] ‘0’, ‘1’ 3031
Function code [H] ‘0’, ‘3’ 3033
Start address [H] ‘9’, ‘0’, ‘0’, ‘0’ 39303030
Number of registers [H] ‘0’, ‘0’, ‘0’, ‘A’ 30303041
Error check [H] ‘6’, ‘2’ (in accordance
with LRC calculation)
3632
Trailer ‘CR’, ‘LF’ 0D0A
The response to the query is as follows.
Response: 010314000000000000B80162002000800031C7000800111C [CR][LF]
Field ASCII mode
fixed character string
Converted ASCII code data [H]
Header ‘:’ 3A
Slave address [H] ‘0’, ‘1’ 3031
Function code [H] ‘0’, ‘3’ 3033
Number of data bytes [H] ‘1’, ‘4’ (20 bytes = 10 registers) 3134
Data 1 [H] ‘0’, ‘0’, ‘0’, ‘0’, ‘0’, ‘0’, ‘0’, ‘0’ 3030303030303030
Data 2 [H] ‘0’, ‘0’, ‘0’, ‘0’ 30303030
Data 3 [H] ‘B’, ‘8’, ‘0’, ‘1’ 42383031
Data 4 [H] ‘6’, ‘2’, ‘0’, ‘0’ 36323030
Data 5 [H] ‘2’, ‘0’, ‘0’, ‘0’ 32303030
Data 6 [H] ‘8’, ‘0’, ‘0’, ‘0’ 38303030
Data 7 [H] ‘3’, ‘1’, ‘C’, ‘7’ 33314337
Data 8 [H] ‘0’, ‘0’, ‘0’, ‘8’, ‘0’, ‘0’, ‘1’, ‘1’ 3030303830303131
Error check [H] ‘1’, ‘C’ (in accordance with LRC
calculation)
3143
Trailer ‘CR’, ‘LF’ 0D0A
Note The data of the response example is simply an example and will vary depending on
various conditions.