Hitachi RAC-E14H2 - Page 43

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Fig. 3-4
(1)Outdoor microcomputer (HIC) to indoor microcomputer
Serial Communications Format during Normal Communications
Example
When the outdoor message is all 0s
and indoor message is all 1s:
(3)Communications waveforms
Leader
(100ms.)
Leader
(100ms.)
When reset
(approx.100ms.)
When reset
(approx.10ms.)
35
(
V
)
34
(
V
)
36
(
V
)
0
7
0
7
7
7
0
(33.3ms.)
3
2
1
No.
0
Bit No.=0
7
0
7
0
7
0
7
Bit No.=0
3
2
1
(33.3ms.) (33.3ms.)
(33.3ms.)
Transmit/
receive
switching time
(4.95ms.)
(33.3ms.) (33.3ms.)
Outdoor message
Indoor message
(33.3ms.)(33.3ms.)
0
Character No.
(2)Indoor microcomputer to outdoor microcomputer (HIC)