LG V-net PQNUD1S00 Owner's Manual page 12

Internal Wiring Diagram
■
...
Power
220~240V/AC
50/60 Hz
CN_POWER
The color and polarity of the communications line can differ
from what's indicated on the PCB depending on the
manufacturer of watt meter. [ Black -> (+), white -> (-) ]
• Turn on the power after connecting the product.
12 Electricity Distribution Indicator
Indoor unit
Watt-hour meter
+ TX : A
WHITE BLACK
(-)
(+)
PI-485
Multi V or PI485
Remote Reading
Device (Option)
INT. B
RX : B BUS B
+
Multi V
PDI WHM
INT. A
BUS A
B A