Hitachi RAD-18NH7A Service Manual page 54

Outdoor HIC
Indoor microcomputer
DC 35V line
Fig. 2-2 Voltages Waveforms of indoor / Outdoor Microcomputers (Outdoor to Indoor Communications)
Outdoor HIC
Indoor microcomputer
DC 35V line
Fig. 2-3 Voltages Waveforms of indoor / Outdoor Microcomputers (Indoor to Outdoor Communications)
30
Pin
29
Pin
Pin 50
49
Pin
100ms.
Leader
Pin 30
Pin 29
50
Pin
Pin 49
4.95ms.
Transmit / receive
switching time
33ms.
1 frame
33ms.
1 frame
– 64 –
0.7V
0V
5V
0V
5V
0V
5V
0V
35V
0V
5V
0V
5V
0V
5V
0V
35V