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"Temperature1 query" frame format – the data display system to the detecting unit (for the
D7
D6
D5
D4
0
1
0
1
1
0
1
0
0
1
1
1
address
0
0
0
0
control
* - 0FFh address – broadcast address. All detecting units respond to the query with such address.
"Current temperature1" frame format – the detecting unit to the data display system
D7
D6
D5
D4
0
1
0
1
1
0
1
0
0
1
1
1
address
0
0
0
0
2
3
2
2
2
1
2
0
D7
X
X
X
control
detecting units with embedded temperature detector)
D3
D2
D1
D0
0
1
0
1
Byte 55h – start-of-frame character
Byte AAh
1
0
1
0
0
0
0
0
D7...D4– protocol v1.3 character
D7...D0– detecting unit address*
1
0
0
0
D7...D0–"Temperature1 query" frame code
arithmetical checksum with a carry
D3
D2
D1
D0
0
1
0
1
Byte 55h – start-of-frame character
1
0
1
0
Byte AAh
0
0
0
0
D7...D4– protocol v1.3 character
D7...D0– detecting unit address
1
0
0
0
D7...D0–"Temperature1 query" frame code
2
-1
2
-2
2
-3
2
-4
S=0-above-zero temperature
S=1-below-zero temperature
S
2
2
2
D7=0-normal
6
5
4
detector
D7=1-failure of temperaturedetector
arithmetical checksum with a carry
Temperature, binary number
operation
34
of
temperature
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