Hitachi RAM-60QH4 Manuel De Service page 76

Base of outdoor P.W.B Q801, Q802
Outdoor micro computer
Indoor micro computer
35V DC line
Fig. 2-2 Voltages Waveforms of Indoor / Outdoor Micro computers (Outdoor to Indoor Communications)
Base of outdoor P.W.B Q801, Q802
Outdoor micro computer
Indoor micro computer
35V DC line
Fig. 2-3 Voltages Waveforms of Indoor / Outdoor Micro computers (Indoor to Outdoor Communications)
Pin
70
Pin
72
Pin
Pin
100ms.
Leader
Pin
69
Pin
71
Pin
Pin
5-7.5ms.
Transmit/receive
switching time
33ms.
1 frame
33ms.
1 frame
– 88 –
0.7V
0V
5V
0V
5V
0V
5V
0V
35V
0V
5V
0V
5V
0V
5V
0V
35V