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Query of the current sensor state
Command master to sensor
Character Character/Meaning
position
1
s
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
S
2
tens digit of the sensor address
3
units digit of the sensor address
4
first character of the status byte
5
second character of the status byte
6
check digit 3
7
check digit 2
8
check digit 1
9
command end
10
command end
Example
master
s04
transmits
sensor
responds
The two digits of the status information have to be interpreted as one byte. The indi-
vidual bits of this status byte have the following meaning:
bit 0 set:
A reading result is available. This bit will be deleted after query of a
reading result.
bit 1 set:
The last reading was successful.
bit 4 set:
A trigger was activated without the last reading result being queried.
This bit will be deleted after query of a reading result.
To calculate the check digit the character codes of positions 4 and 5 are added. The
check digit is the result of the sum modulo 256.
rd
2
position (10
)
nd
1
position (10
)
st
0
position (10
)
Comment
command character
digits 0-9
digits 0-9
(ASCII code 10d)
Comment
command echo
digits 0-9
digits 0-9
digits 0-9
digits 0-9
digits 0-9
digits 0-9
digits 0-9
(ASCII code 13
)
d
(ASCII code 10
)
d
S0400096
55
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