Hitachi RAC-70DH7 - Page 55

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Base of outdoor P.W.B Q801, Q802 , Q803
Outdoor micro computer
lndoor micro computer SDO Pin
73
74
Pin
9
Pin
Pin
SDI Pin
lndoor micro computer SDO Pin
0.7V
0V
0V
5V
0V
5V
0V
5V
0V
0V
0V
5V
5V
0V
5V
35V
35V
35V DC line
Base of outdoor P.W.B Q801, Q802
Outdoor micro computer
69
11
Pin
68
Pin
Pin
SDI Pin
35V DC line
100ms.
Leader
33ms.
1 frame
5-7.5ms.
Transmit/receive
switching time
33ms.
1 frame
Fig. 2-2 Voltages Waveforms of indoor / Outdoor Micro computers (Outdoor to Indoor Communications)
Fig. 2-3 Voltages Waveforms of indoor / Outdoor Micro computers (Indoor to Outdoor Communications)