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LG PQCSB101S0 Installation Manual page 9

Simple central controller
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2. Simple central controller installation case 2
Communication line can be extended to up to 16 simple central
controllers with one serving as master and others as slave.
Installation method
1. Connect 4 wires to only one remote control from any one outdoor unit. (black lines are Vcc & GND,
dotted lines are communication line C & D)
2. Then individually connect line C & D to the each of PI 485 controller without connecting Vcc & GND
line.
3. For controller jump all 4 wires for interconnecting the controllers.
4. This saves installation wiring, cost and time.
5. One PI 485 can supply power to maximum 3 controllers only.
System Wiring Drawing
Slave
Slave
Installation Manual 9
Vcc
GND
C
D
Master

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