Hitachi RAF-25FX8 Service Manual page 94

Outdoor microcomputer
Indoor microcomputer
35V DC line
Fig. 3-2 Voltages Waveforms of indoor / Outdoor Microcomputers (Outdoor to Indoor Communications)
Outdoor microcomputer
Indoor microcomputer
35V DC line
Fig. 3-3 Voltages Waveforms of indoor / Outdoor Microcomputers (Indoor to Outdoor Communications)
Pin
11
68 Pin
Pin
Pin
100ms.
Leader
Pin
11
68 Pin
Pin
Pin
4.95ms.
Transmit/receive
switching time
– 112 –
33ms.
1 frame
33ms.
1 frame
0.7V
0V
5V
0V
5V
0V
5V
0V
35V
0V
5V
0V
5V
0V
5V
0V
35V