Midea ATOM B Series - Page 38

Atom B Series VRF 50/60Hz
37
Part 5
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Electrical Components and Wiring Diagrams
Figure 5-2.3: 28/36/42/48/56 model outdoor unit Communication converter board PCB Ports
Table 5-2.3: 28/36/42/48/56 model communication converter board PCB ports
Label in
Figure 5-1.3
Port code
Content
Port voltage
1
CN4
P Q E X Y E communication port
2.5-2.7V DC
2
CN3
Digital multimeter communication port
0-5V DC
3
CN300
Chip burning port
0-5V DC
4
CN2
P Q E X Y E communication port
O A communication port（reserved）
0-5V DC
5
CN1
Main board 5V power supply port; communication port
between main board and module board
5V DC and 0~5V
DC
6
CN7
Signal input port of system low pressure detect switch
0 or 5V DC
7
CN9
T3/T4 port
0-5V DC
8
CN8
Signal input port of system high pressure detect switch
0-5V DC
9
CN6
Signal input port of Refrigerant radiator temperature
0-5V DC
10
CN5
Signal input port of Discharge temperature
0-5V DC
10
1
2
3
4
5
6
7
8
9