Hitachi RAM-40QH5 Service Manual page 40

Base of outdoor P.W.B. Q801, Q802
Outdoor micro computer pin 70 , 72
Indoor micro computer pin
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 pin 69 , 71
Indoor micro computer pin
35V DC line
Fig. 2-3 Voltages Waveforms of indoor / Outdoor Micro computers (Indoor to Outdoor Communications)
49
Pin 48
100ms.
Leader
49
48
Pin
5 ~ 7.5ms.
Transmit / receive
switching time
– 46 –
33ms.
1 frame
33ms.
1 frame
0.7V
0V
5V
0V
5V
0V
5V
0V
35V
0V
5V
0V
5V
0V
5V
0V
35V