Hitachi RAS-08PH1 - Page 45

Fig. 2-1 shows the interface circuit used for the indoor and outdoor microcomputers to communicate
with each other.
(SDO)
I/F TRANSMISSION
(SDI)
I/F RECEPTION
48
C213
R255
R254
Q205
0V
0V
5V
R256 R214
R257
D206
IC5(1/2)
4
6
R260 R261
R258
R259 R262
0V
5V0V
R263
Q204
R268
5V
6.5V
0V
R803
Q801
R801
R802
C802
C801
L801
I / F0V
NF COIL 2
C808
L802
0V
12V
(Communications from indoor microcomputer to outdoor microcomputer)
(Communications from outdoor microcomputer to indoor microcomputer)
Fi
g
. 2-1 Indoor / Outdoor interface circuit
CONTROL P.W.B .
C807
C806
35V
28
27
5
7
51
45