LG Electronics 22LQ630H, 32LQ630H Pillow Speaker Setup, Controlling the TV with Serial Data

EXTERNAL EQUIPMENT SETUP

PILLOW SPEAKER SETUP

EXTERNAL EQUIPMENT SETUP

V Connect a pillow speaker to the LCD TV/Monitor.

How to connect

Connect the pillow speaker (see example at right) to the PILLOW SPEAKER interface on the rear jack panel of the TV.

Use a pillow speaker that is a UL recognized pendant control bearing the warning:

“Risk of fire if used in oxygen enriched atmosphere. Keep pendant control away from oxygen equipment.”

Controlling the TV with Serial Data

These TV models are capable of being controlled by a single-wire, serial data signal. This is an LG patented technology and is being implemented by certain brands of “smart” pillow speakers.

Pillow Speaker Interface

This connector provides an interface for patient-pendant remote control or entertainment audio and nurse call systems. All lines are isolated from the AC power line. (Optoisolators isolate the control lines, and a transformer isolates the audio.) Earth ground is pro- vided on pin 4 (Common) in the default configuration (e.g., for Zenith/Philips pillow speakers). For negative voltage configuration (e.g., for RCA pillow speakers), +5 volts is provided on pin 4 (Common), with pin 3 (Channel Up/Data In) referenced to ground.

The following table describes the pillow speaker interface pinout (see also diagram at right).

Typical Pillow Speaker

(Serial Data Control)

PILLOW SPEAKER

Typical Schematic for

Analog Pillow Speaker

Pillow Speaker Interface Pinout

Pin No.	Description
1	Analog external control for TV ON/OFF.
2	No connection
3	Analog external control for Channel Up or Serial
	Data in.
4	Common connection for control, data, and audio
	output.
	Isolated Audio Output. Nominal 14 ohm source
5	impedance with short circuit protection. Intended
	for a pillow speaker with a lowimpedance, pad-
	type volume control.
6	Analog external control for Channel Down.

Controlling the TV with Mechanical Switches

A typical analog pillow speaker with mechanical switches will momentarily connect pin 1, 3, or 6 to pin 4 (Common) to control Power ON/ OFF, Channel Up, or Channel Down (see sche- matic above). These pins are at +13 volts DC (when measured from pin 4) with the switches open. Typical current draw is 8 mA when a switch is closed. (This operation is identical to previous models using the 5-wire interface, except that only +7 volts DC was supplied and current draw was only 2.5 mA.)

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