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"Temperature 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
1
0
0
0
* - 0Fh address – broadcast address. All detecting units respond to the query with such address.
"Current temperature" frame format – the detecting unit to the data display system
D7
D6
D5
D4
0
1
0
1
1
0
1
0
1
0
0
0
2
2
2
2
3
2
1
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
А3
А2
А1
А0
D3
D2
D1
D0
0
1
0
1
Byte 55h – start-of-frame character
Byte AAh
1
0
1
0
D7...D4 –"Temperature" frame code
А3
А2
А1
А0
D3...D0 – detecting unit address
2
2
2
2
-1
-2
-3
-4
S=0-above-zero temperature
S=1-below-zero temperature
D7=0-normal
S
2
2
2
6
5
4
detector
D7=1-failure of temperature detector
arithmetical checksum with a carry
D7...D4 – "Temperature query" frame code
D3...D0 – detecting unit address *
Temperature, binary number
operation
28
of
temperature
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