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"Serial #_1 query" frame format – the data display system to the detecting unit
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.
"Serial #_1" 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
Serial No._0 (low byte)
Serial No._1
Serial No._2
Serial No._3 (high byte)
current constant
control
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*
0
1
0
1
D7...D0–"Serial#_1 query" frame code
arithmetical checksum with a carry
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
0
1
0
1
D7...D0–"Serial#_1" frame code
Serial No. of the detecting unit
D7...D0–current response delay factor to
arithmetical checksum with a carry
broadcast query
35
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