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Reference: Pillow Speaker Setup
The pillow speaker will only be functional after the Express Script/Custom Master TV Setup and/or
cloning procedures are complete.
Note: When Installer Menu item 027 HOSPITAL MODE is set to 254 (factory default value), there is no
power (voltage) supplied to the pillow speaker.
1
2
3
4
5
6
3
1
5
2
4
6
TV ON/OFF
NC
CHAN UP/DATA IN
COMMON
AUDIO OUT
CHAN DOWN
3
TV
ON/OFF
CHAN
DOWN
CHAN
UP
(MALE
PLUG)
VOLUME CONTROL
SPKR
5
1
4
6
2
Connecting a Pillow Speaker to the TV
Connect the pillow speaker (see example at right) to the PILLOW
SPEAKER interface on the rear jack panel of the TV.
Caution: Use a pillow speaker that is a UL recognized
pendant control bearing the warning: “Risk of re 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 provided 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).
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.
5 Isolated Audio Output. Nominal 14 ohm source impedance with
short circuit protection. Intended for a pillow speaker with a low-
impedance, 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 schematic at right). 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.)
PILLOW SPEAKER
CHANNEL
VOLUME
TV
POWER
MUTE
OPTIONSLEEP
PREV
Typical Pillow Speaker
(Serial Data Control)
Typical Schematic for
Analog Pillow Speaker
Pillow Speaker Interface Pinout