LG 42LD6DDH - Manual (Page 26)

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Connect a pillow speaker to the LCD TV/Monitor.
PILLOW SPEAKER SETUP
1. How to connect
1
Connect the PILLOW SPEAKER output jack on the
back of the TV.
2
Connect an accessory pillow speaker or wired remote
control unit to this 6-pin jack.
3
Select PILLOW SPEAKER on the rear panel of the TV.
PILLOW
SPEAKER
NORMAL
SPEAKER
PILLOW
SPEAKER SPEAKER SWITCH
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
The TV is capable of being controlled by a single-wire, serial data
signal. This is a LG patented technology and is being implemented
by certain brands of “smart” pillow speakers.
Pillow Speaker Interface
This connector furnishes three control lines and an audio output.
A patient-pendant remote control, or entertainment audio and
nurse call system may be connected here. All lines are isolated
from the AC power line and earth ground. (Optoisolators isolate
the control lines, and a transformer isolates the audio. There are
no relays or inductive components in the control lines.)
pin No. Purpose
1 External TV On/Off switch.
2 (Not used.)
3 External Channel Up switch or Data in.
4
Common connection for control, data, and audio
output. Impedance to earth ground is a 10-meg
resistor in parallel with a 1100 pf capacitor.
5
Isolated audio output. Nominal 14-ohm source
impedance with short circuit protection. Intended
for a pillow speaker with a low-impe ance pad-
type volume control.
6 External Channel Down switch.
Controlling the TV with Mechanical Switches
Pin 4(common) is momentarily connected to
pin 1, 3, or 6 via push-action switches to
control On/Off and Channel Up/Down.
These pins are at +13volts DC(when measured
from pin4) with the switches open.
Current draw is 8 mA when a switch is closed.
(This opebration is identical to previous LG
models using the 5-Wire Interface except that
only +7 volts DC was supplied and current
draw was only 2.5 mA.)