Zenith H20H52DT - Manual (Page 11)

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 8.2- meg resistor
in parallel with a 1000 pf capacitor.
5
6 External Channel Down switch
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.
3
TV
ON/OFF CHAN
DOWN CHAN
UP
(MALE
PLUG)
VOLUME CONTROL
SPKR.
5
1
4
6
2
TV
Page 11
Pillow Speaker Hook Up
Connect a Pillow Speaker to the HealthView TV.
ANTENNA
CABLE
M.P.I.
TV Back Panel
(Expanded View)
PILLOW SPEAKER
TV SPEAKER
VIDEO IN SPEAKER OUT
AUDIO IN
TV Back
Locate the Pillow Speaker Output jack on
the back of the HealthView TV.
Connect an accessory pillow speaker or
wired remote control unit to this 6-pin
jack.
Select PILLOW SPKR on the rear panel
of the HealthView TV.
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 +13 volts DC (when measured from pin 4)
with the switches open. Current draw is 8 mA
when a switch is closed. (This operation using
the 5-Wire Interface except that only +7 volts
DC was supplied and current draw was only 2.5
mA).
1
2
3
1
2
3
4
5
6
3
1
5
2
4
6
TV ON/OFF
OPEN
CHAN UP/DATA IN
COMMON
AUDIO OUT
CHAN DOWN
Pillow speaker not included with
HealtView TV.
Use a pillow speaker by Curbell, Model A-16455-
02 or other 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 Zenith patented
technology and is being implemented by certain
brands of “smart” pillow speakers, such as
Curbell’s “GEN-II” models.
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.
(Opto-isolators isolate the control lines, and a
transformer isolates the audio. There are no
relays or inductive components in the control
lines).