Midea ATOM B Series Service Manual page 38

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
1
2
3
4
5
6
7
8
9
10
3
2
Port code
CN4 P Q E X Y E communication port
CN3 Digital multimeter communication port
CN300 Chip burning port
P Q E X Y E communication port
CN2
O A communication port（reserved）
Main board 5V power supply port; communication port
CN1
between main board and module board
CN7 Signal input port of system low pressure detect switch
CN9 T3/T4 port
CN8 Signal input port of system high pressure detect switch
CN6 Signal input port of Refrigerant radiator temperature
CN5 Signal input port of Discharge temperature
4 5
1
Content
Atom B Series VRF 50/60Hz
6
7
8
9
10
Port voltage
2.5-2.7V DC
0-5V DC
0-5V DC
0-5V DC
5V DC and 0~5V
DC
0 or 5V DC
0-5V DC
0-5V DC
0-5V DC
0-5V DC
37