IFM Electronic efector 190 Data Matrix Notice Pour Utilisateurs page 54

Query of the last reading result
Command master to sensor
Character Character/Meaning
position
1 q
2 tens digit of the sensor address
3 units digit of the sensor address
4 command end
Response sensor to master
Character Character/Meaning
position
1 Q
2 tens digit of the sensor address
3 units digit of the sensor address
4 length information 3
5 length information 2
6 length information 1
7 first byte of the reading result
8 second byte of the reading result
: :
n last byte of the reading result
n+1 check digit 3
n+2 check digit 2
n+3 check digit 1
n+4 command end
n+5 command end
Example
master
q37
transmits
sensor
responds
For calculating the check digit all character codes from position 4 to position n are
added. The check digit is the result of the sum modulo 256.
54
rd
position (10
nd
position (10
st
position (10
rd 2
position (10 )
nd 1
position (10 )
st 0
position (10 )
Comment
command character
digits 0-9
digits 0-9
(ASCII code 10
Comment
command character
digits 0-9
digits 0-9
2
) digits 0-9
1
) digits 0-9
0
) digits 0-9
digits 0-9
digits 0-9
digits 0-9
(ASCII code 13
(ASCII code 10
Q37012Hello world!208
)
d
)
d
)
d