Hitachi RAC-25NH5, Service Manual

Page: 62 / 112

– 73 –
[Ser
ial Comm
unications F
o
rmat dur
ing Nor
mal Comm
unications]
(1) Outdoor microcomputer (HIC) to indoor microcomputer (2) Indoor microcomputer to outdoor microcomputer (HIC) (3) Comm
unications w
a
v
e
fo
rm
s
1 fr
ame = 100ms
. + 33.3ms
. x 8 + 4.95ms
. = 371.35ms
.
Outdoor message
Indoor message
[Example]
When the outdoor message is all 0s and indoor message is all 1s:
36 (V) 35 (V) 34 (V)
When reset (appro
x.
10ms
.)
T
ransmit/
receiv
e
s
witching time
(4.95ms
.)
Char
acter No
.
0
(33.3ms
.)
1
(33.3ms
.)
2
(33.3ms
.)
3
(33.3ms
.)
Char
acter No
.
0
(33.3ms
.)
1
(33.3ms
.)
2
(33.3ms
.)
3
(33.3ms
.)
Bit No = 0
Bit No = 0
0
7
0
70
70
77
0
70
77
Leader
(100ms
.)
When reset
(appro
x.
10ms
.)
Leader
(100ms
.)
Fig. 2-4