LG Electronics PRHR040 manual CNU I-Gateway / PI485, Part description, Wiring diagram, PQNFG14B0

61799 LG Multi V Catalogue 9/5/07 9:18 am Page 98

CNU (I-Gateway) / PI485

CNU (I-Gateway)

Features

•CNU converts the ethernet protocol into RS 485 protocol and vice versa.

•Used with deluxe and P/C based central controllers.

PQNFG14B0

•Part description

Adaptor connection

DC 9V (supplied)

RJ45 connector

Connected with the HUB

Deluxe central controller

PI485 connection
BUS_A : PI485 A terminal[+]	AC/DC adaptor
BUS_B : PI485 B terminal[-]

•Wiring diagram

Cross cable

Without hub

Direct cable

With hub

Direct cable

PI485

Features

		PI485 converts the protocol of air-conditioner to the 485
		protocol for central controller.
		• Device for simple/deluxe/PC controllers.
		• Supports communication wires length flexibility up to 1km.
		• Different types of PCB for different products.
		-Option select (LGAP, CAC, RAC)
PMNFP14A0	PMNFP14A1	-LED display (Communication state)
		-Four different types
		• Available Max. 16 Indoor units : PMNFP14A0
		• Available Max. 48 Indoor units : PMNFP14A1

•Wiring diagram

outdoor PCB

CN_central

Multi outdoor terminal block

A B E F C D VCC GND

BUS_A

BUS_B

BUS_A

BUS_B

98_ Air conditioning system