Valet System One MINI User manual

Intercom Installation Guide
Distributed by
Lindsay Manufacturing, Inc.
www.vacumaid.com
1-800-546-3729
L6237

TABLE OF CONTENTS
GENERAL INFORMATION ............................................................ 2
LOCATION OF EQUIPMENT......................................................... 3
ROOM STATIONS .......................................................................... 3
FRONT DOOR/GATE STATION(S) ................................................ 3
POWER SUPPLY ........................................................................... 3
ANTENNA(AM/FM AERIALS)........................................................ 4
AUXILIARY INPUT JACK ............................................................... 4
AUXILIARY/LOCK OUTPUT BOARD ............................................ 4
WHERE TO RUN CABLE .............................................................. 5
WHAT CABLE TO USE ? .............................................................. 5
MAXIMUM LENGTH FOR CABLE RUNS..................................... 6
INSTALLATION OF SYSTEM ONE MINI ................................. 8-11
INSTALLATION OF DOOR/GATE STATIONS ............................ 12
INSTALLATION OF AUXILIARY INPUT JACK ........................... 12
POWER SUPPLY ........................................................................... 8
WIRING DIAGRAM ...................................................................... 10
CONTROL VOLTAGE LOAD RESISTOR ................................... 10
PROGRAMMING ROOM STATIONS .......................................... 13
KEYPAD BACKLIGHTING .......................................................... 14
DOOR STATION ADJUSTMENTS............................................... 14
CHANGING THE CHIME ............................................................. 15
CHIME VOLTAGE OUTPUT ........................................................ 15
SIX WIRE OPERATION USING ROOM STATIONS................... 16
CABLE FUNCTIONS ................................................................... 17

The following general procedures
must be observed in relation to the
location and installation of System
OneHome Communication
components:
•Stations are not to be installed
“back to back” or in “line of
sight” of each other as this will
cause feed-back (squealing).
•Where stations are to be fitted
externally, appropriate
measures to provide protection
from weather are to be taken.
•Avoid running Intercom cable
in parallel to electrical wiring.
•The Power supply is not to be
installed in a cavity wall or any
area (roof etc) where
temperatures are likely exceed
100°F.
•Guidelines for maximum cable
lengths as set out in this
manual are to be observed to
avoid the possibility of
operating problems due to
excessive voltage drop.
•The maximum number of
stations on a system including
Master, Room and Door
stations is generally limited to
20. It is important that the
power supply is properly
matched to the size
of the system. (See Power
Supply on pg 8)
CAUTION: Failure to use
specified cable may cause
problems with the performance of
the system and will void warranty on
the equipment.
IMPORTANT:Responsibility will not
be taken for problems that arise
from the improper use of cable or
interference generated externally
to the system.
Interference by light dimmers,
fluorescent lighting and similar
electrical products, must be
corrected at the source.
An aid to reducing the effects of this
type of interference is to place
stations and wiring no closer than
30cm (12”) from any AC device or
wiring.
The circuitry of the intercom has
been designed to minimize the
effects of Radio Frequency
Interference however total
immunity to this type of interference
cannot be guaranteed where the
levels of interference generated are
extreme.
GENERAL INFORMATION
POS - 15 VDC (RED)
May measure from 13.8V to 15.5 VDC with respect to 0V depending on voltage
drop due to cable length.
NEG - 0 VDC (BLACK)
TC - TIMER CONTROL (SHIELDED RED)
Holds receiving stations on line for period controlled by initiating station.
Normally low. Goes high when chime activated or call initiated from any station.
Stays high until chime or call is reset.
VLC - VOLTAGE LEVEL CONTROL (SHIELDED WHITE)
Carries different voltage levels generated by initiating station to allow targeting
of calls etc. Voltage is present for duration of button press or chime activation.
COMMUNICATION LINES - COM1 (WHITE) & COM2 (BLUE)
Carries balanced audio signal for Chimes, Private Calls & Paging Calls.
MUSIC/ MONITOR LINES - MUS1 (GREEN) & MUS2 (ORANGE)
Carries balanced audio signal for Music and Monitoring.
AUX - AUXILIARY OUTPUT CONTROL (SINGLE CORE)
Carries different voltage levels generated at initiating station, to control specific
outputs on Auxiliary Output boards.
NOTE: Shielded cable recommended for TC and VLC Lines to prevent
spikes caused by rising and falling control signals being induced
onto audio lines.
CABLE FUNCTIONS

ROOM STATIONS
Careful consideration must be given
to present and/or future layout of
furniture so as not to locate stations
in inappropriate positions.
To avoid audio feedback, room
stations should be kept at least 13-
16 ft. away from other stations.
Never have more than one station
in any one room and avoid
mounting stations in the same wall
cavity.
i.e. directly below and above one
another in a two story house.
A suitable height is generally 4’6”
from the floor to the center of the
unit.
Stations located on timber frame
walls should be located adjacent to
a stud to allow for firm fixing.
Stations located on cavity brick
walls will require the installation of
wall boxes.
Stations installed on single brick
walls will also require wall boxes;
however, the cable will need to be
chased and conduited into the brick
wall.
The rear of the brick wall will need
to be rendered or lined as the depth
of a room station is approximately
the same as a brick.
Where stations are required in
bathrooms or laundries, they must
be kept clear of water or steam.
Where stations are mounted on a
tiled surface, a wall box should be
LOCATION OF EQUIPMENT
FRONT DOOR/GATE STATION(S)
These stations are best located
adjacent to the front door or at the
front gate at a suggested height of
4’6” and may require a wall box
depending upon the surface to
which they are to be affixed.
Any Station exposed to the weather
will require the fitting of a
weatherproof cover.
Where stations are to be installed in
solid brick or concrete columns at a
front gate, it is required that the
cable be run in conduit from the
station to ground level and back to
the house.
POWER SUPPLY
The power supply is usually located
no less than 6 ft and not more
than 16 ft from the point of
connection at the master. (or from
the point of connection at a room
station if a master has not been
fitted)
installed prior to lining/tiling of the
walls and the tiles will need to be
cut to the inside dimensions of the
wall box.
Where room stations are mounted
outside and are exposed to the
weather, the fitting of weather proof
covers will be required.
Stations must not be installed in
saunas.
Room Stations
• Press “PRIVACY” and
“MONITOR” buttons simultaneously
to enter Program Mode.
• Press “HOUSE” button to select
“6 wire” mode. (Green LED off)
• Press “CLEAR” button to exit
Program Mode.
POS
NEG
COM1
COM2
TC
VLC
SHLD
CH
VR3
VR2
VR1 SEL
PROG
U5
SEL
PROG
Procedure
1) Press the Program button
(PROG) – The red LED illuminates
and the current chime is played.
2) Press the Program button again
to select voltage output option mode
– The red LED flashes the current
output voltage option.
3) Press the Select button (SEL) –
The next output option is displayed.
• Music lines (MUS1 and MUS2)
are omitted. (No wire links
required at Room Stations)
• The station will toggle between 6
wire mode (Green LED off) and 8
wire mode (Green LED on)
each time the “HOUSE” button is
pressed while in program mode.
SIX WIRE OPERATION USING ROOM STATIONS
Although System One is designed to operate optimally using 8 wire Hook-up, it
will also operate using 6 wire hook-up with the trade off that music will mute at
all stations during private communication. (With 8 wire hook-up music only
mutes at the 2 stations involved in communication)
To operate a system using 6 wire hook-up, the following is required.
4) Repeatedly press the Select
button until the desired voltage
output option is displayed.
5) Press the Program button again
to lock in selection and exit program
mode – The red LED extinguishes.
NOTE: Pressing the Select button
after all 3 output options have been
sampled, will result in returning to
the first output option.

Suggested locations are kitchen
cupboards, pantry, bedroom
wardrobes etc.
Because the power supply
dissipates heat more effectively in a
cool environment it is recommended
that the supply not be located in the
roof space of a dwelling. It is also
advantageous to have easy access
to the supply should it be required
that the system be turned off.
ANTENNA (AM/FM AERIALS)
The antenna arrangement is a
critical part of the installation if a
quality radio reception is required.
The AM and FM aerials should be
located in the highest point of the
roof and at least 6 ft away from any
electrical or intercom wiring.
Because the FM antenna is
directional, experimentation with
positioning is recommended to
achieve the best possible result.
Where the roof is lined with foil
insulation or is of metal construction,
an external whip or car radio
antenna may be required for AM.
Connecting a specialized FM
antenna or connecting to a TV
antenna can greatly improve FM
reception in poor signal areas.
AUXILIARY INPUT JACK
Optional accessory allowing music
from an external source such as a
Tape Deck,
CD player or walkman to play
throughout the Intercom System.
The Input Jack should be installed
in a wall near the location where the
external music source is to be
situated.
NOTE: An appropriate lead will be
required to connect the music
source to the Input Jack.
The use of appropriate cable from
the Input Jack to the master (or
from the Input Jack to a room
station where a master is not used)
is essential.
See section ‘What Cable To Use’.
AUXILIARY/LOCK
OUTPUT BOARD
Optional Accessory allowing
Electronic door locks, Automatic
gates, Courtesy lights, Alarm panic
circuits, etc. to be controlled from
the Master or any Room station.
There are two (2) outputs on each
board which can individually be
programmed to time out or toggle
depending on the application.
Four (4) of these boards can be
fitted to any one system allowing a
total of eight (8) Auxiliary outputs in
total.
Each board is fitted in conjunction
with a room station and is located
in the side compartment of the room
station back housing.
NOTE: Additional wiring is required
for this feature to be available.
See section ‘What Cable To Use’.
The CH Terminal provides an output voltage whenever the chime button is
pressed.
The duration of this output voltage is set by 1of 3 programming options.
POS
NEG
COM1
COM2
TC
VLC
SHLD
CH
VR3
VR2
VR1 SEL
PROG
U5
SEL
PROG
Procedure
1) Press the Program button
(PROG) – The red LED illuminates
and the current chime plays.
2) Press the Select button (SEL) –
The next chime option plays.
3) Repeatedly press the Select
button until the desired melody is
heard.
The chime melody can be changed to any one of nine options by means of the
two programming switches (SEL & PROG) situated on the door station circuit
board as indicated below.
4) Press the Program button to lock
in selection – The red LED flashes.
5) Press the Program button again
to exit program mode – The red
LED extinguishes.
NOTE: Pressing the Select button
after all 9 chime options have been
sampled, will result in returning to
the first chime option.
Chime Voltage Output Options
Option #1 Single flash Voltage present for duration of Bell Press
Option #2 Double flash Voltage present for duration of Chime
Option #3 Triple flash Voltage present for 10 seconds from moment of
Bell Press
The chime output voltage duration can be changed by means of the two
programming switches (SEL & PROG) situated on the door station circuit board
as indicated.
CHANGING THE CHIMES
CHIME VOLTAGE OUTPUT

WHERE TO RUN CABLE
Cables can be run either:
•In the roof space
•In false ceilings/bulkhead area
•Through &/or around external walls
•Under floors (subject to access
being available)
Note:
Intercom cables should be run as
far away from AC wiring as
practicality permits.
Avoid running intercom cable in
parallel to AC or any other type of
wiring. (Running across at right
angles is OK where necessary)
All aerial wires should be taken to
the highest and most accessible
point in the roof.
Allow additional cable at each
station for the purpose of term-
ination.
In the case of cavity brick walls,
ensure the wires are pulled through
one of the holes at the rear of the
wall box.
CABLE
WHERE TO RUN CABLE
WHAT CABLE TO USE ?
General
System One is designed to operate
using 8 core cable; however,
operation is also possible using 6
core cable with the disadvantage
that music will be muted at all room
stations while private communication
is in progress.
The system may be Star Wired from
acentralpoint orLoop Wiredhowever
the number of stations on a loop is
governed by the length of the loop,
and also whether or not a standby
battery is being used in conjunction
with the supply. See section
“Maximum Cable Lengths”.
Important Note: Different cables
have different characteristics hence
it is recommended that ‘Valet Cable’
be used on all new installations.
Many other cables will work
acceptably however responsibility
cannot be taken for problems that
arise from the use of other cables.
The proper use of shielded cable on
VLC & TC terminals will prevent
“clicks & pops” caused by Control
Voltage changes from being
induced onto audio lines.
Power Supply
Heavy duty ‘Figure 8’ cable (24 x
0.20mm or better) should be run
from the Power Supply to the
master. (Power Supply to any room
station if a master is not fitted)
AM Aerial
The coaxial cable supplied with the
master is to be run from the master
to the highest point in the roof
where the antenna tail provided (or
a car radio antenna) must be
plugged into the socket at the end
of the cable. The plug at the master
end of the cable must be cut off.
Additional AM coax leads can be
plugged into one another if
additional length is required.
Exit program mode by pressing
the “CANCEL/CLEAR” button.
Note: Single and Double Digit
format cannot be mixed in one
system.
- Each station is to be individually
programmed to the same format.
- Repeated pressing of the “AUX”
button while in program mode will
toggle between Single and Double
Digit formats.
KEYPAD BACKLIGHTING
The Room Stations have Keypad
backlighting which can be enabled
and disabled by pressing the
“DOOR” button while in Program
mode, as outlined above.
DOOR STATION ADJUSTMENTS
There are three adjustments on the
door station which may require fine
tuning after installation.
NOTE: A flat bladed screw driver
with a blade width of between 2mm
and 2.4mm is required for these
adjustments.
The use of an incorrect screw driver
will result in the pot being damaged.
Door Station Volume
Speaker volume at the door station
is adjusted by means of a miniature
trim pot (VR1) located in the center
of the circuit board.
Turning this pot will vary the
speaker volume.
This adjustment can be made while
someone is communicating to the
door station from one of the internal
stations or while the chime is
activated.
Chime Volume
Chime volume is adjusted by
means of a miniature trim pot (VR2)
situated at the bottom of the circuit
board as indicated below.
Turning this pot will vary the chime
volume throughout the system.
This pot should be adjusted so the
chime volume comes through at an
acceptable level at an internal room
station with its slide volume control
set to around level 4 or 5.
Microphone Gain
The microphone gain pot (VR3) is
generally set half way and would
rarely require adjustment.
The microphone level can be turned
down where the door station causes
feedback in a room station due to
close proximity or can be turned up
if the communication level at
internal stations is too low.
CHIME
VOLUME
SPEAKER
VOLUME
POS
NEG
COM1
COM2
TC
VLC
SHLD
CH
VR3
VR2
VR1
MICROPHONE
GAIN
U5

Auxiliary Input Jack [Optional]
Run 6 core cable (or same wire as
used for intercom wiring) from Input
Jack to the nearest room station.
FM Aerial
Run the 300 ohm FM Ribbon
antenna supplied with the master
from the master to the highest point
in the roof. If using coaxial cable to
connect to an alternative 75 ohm
antenna, be sure to fit a balun to
the 300 ohm terminals at the
master.
For the purpose of Select Calling
(Calling individual or grouped
stations), each station must be
allocated either a Single Digit or
Double Digit number.
If more than one station is allocated
the same number, the stations
having the same number will form a
group.
Allocating a number to a station, is
done by means of programming via
the keypad.
SINGLE DIGIT CODING
Single Digit Format is the default
programming setting intended for
systems requiring up to 8 select call
channels.
This format offers the convenience
of calling individual stations by
pressing only one button.
Enter program mode by pressing
the “PRIVACY” and “MONITOR”
buttons simultaneously.
If not previously programmed the
station will already be in the default
setting of Single Digit Format where
the red LED will repeatedly flash
the programmed number.
(the default number being 1)
Enter a number between 1 and 8 by
pressing the corresponding button.
The Red LED will repeatedly flash
the programmed number.
Exit program mode by pressing
the “CANCEL/CLEAR” button.
DOUBLE DIGIT CODING
Double Digit Format is a
programming option intended for
systems requiring from 9 to 24
select call channels.
This format requires that two
buttons be pressed in sequence for
calling individual stations.
Enter program mode by pressing
the “PRIVACY” and “MONITOR”
buttons simultaneously
If not previously programmed the
station will be in the default setting
of Single Digit Format where the red
LED will repeatedly flash the
programmed number.
(the default number being 1)
Press the “AUX” button to toggle to
Double Digit Mode.
In Double Digit mode the red LED
will repeatedly flash the following
information.
- Two quick flashes representing
Double Digit Mode
- One to three flashes representing
the first digit (default = 1)
- One to eight flashes representing
the second digit (default = 1)
Enter a double digit number in the
ranges of 11 to 18, 21 to 28, 31 to 38.
(24 possibilities in total)
The red LED will repeatedly flash
the following information.
- Two quick flashes representing
Double Digit Mode
- One to three flashes representing
the first digit of the new number
- One to eight flashes representing
the second digit of the new number
PROGRAMMING
Auxiliary/Lock Outputs
[Optional]
An additional single core cable is
required between all room stations
(and master if fitted).
OPTIONALAUXILIARY INPUTS
Heavy duty ‘Figure 8’ cable (24 x
0.20mm or better) is to be run from
each relay output (via power source
if applicable) to each auxiliary
device.
Note: Clearly tagging all cables at
the master or central wiring point is
recommended, as this can be
extremely helpful in the event of
having to isolate a problem such as
a damaged cable.
As stated in the previous section the system may be Star Wired from a central
point or Loop Wired however the number of stations on a loop is
governed by the length of the loop, and also whether or not a standby battery is
being used in conjunction with the supply.
The table below shows the relationship between the length of a cable run and
the number of stations permitted on the run. The length of a cable run is
determined from the station to which the Power supply is connected.
MAXIMUM LENGTH FOR CABLE RUNS
WITHOUT STANDBY BATTERY
400 feet one station on loop
200 feet two stations on loop
130 feet three stations on loop
100 feet four stations on loop
Note: These maximum distances can be doubled where required by
running a ’‘fig 8’ cable (14 x 0.2 mm) in parallel with the red & black wires.
WITH STANDBY BATTERY
200 feet one station on loop
100 feet two stations on loop
70 feet three stations on loop

PLUG
PACK
DOOR
DOOR
STRIKE
STATION STATIONSTATIONSTATION ROOMROOMROOM
INPUT JACK
TYPE B
POWER
SUPPLY
VALET INTERCOM CABLE
FIGURE 8 CABLE
SINGLE CORE CABLE
NOTE: Single core cable not required if Aux/Lock boards not used
*
ROOM
STATION DOOR
SUPPLY
INPUT JACK
TYPE B
POWER
SUPPLY
INPUT JACK
TYPE B
ROOM
ROOM
ROOM
ROOM
ROOM
ROOM
DOOR
STATION
STATION
STATION
STATION
STATION
STATION
STATION
MECHANICAL
CHIME
AUTOMATIC
GATE
PLUG
PACK
DOOR
STRIKE
VALET INTERCOM CABLE
SINGLE CORE CABLE
FIGURE 8 CABLE
NOTE: Single core cable not required if Aux/Lock boards not used
*
WIRING DIAGRAM
INPUT JACK
INSTALLATION OF DOOR/GATE
STATIONS
Depending on the type of wall to
which the station is to be affixed
i.e. timber or brick, door station
housing DSH may be needed.
Where stations are exposed to
extreme weather, a weather proof
cover should be fitted.
Green and orange wires are not
used at door station. Tape green
and orange wires back to white
outer sheath of valet cable.
Do not connect green and orange
wires of door station cable at room
station end. Tape back in same
manner as above.
Where a door station is part of a
wiring loop, the door station should
always be the last station on the
loop.
INSTALLATION OF DOOR STATIONS
POS (RED)
NEG (BLACK)
TC (SHIELDED RED)
VLC (SHIELDED WHITE)
MUS1 (GREEN)
MUS2 (ORANGE)
NOTE: For 6 Wire Systems
input jack to Com1 (White) a
n
Com2 (Blue) of room station.
..
- Connect Green & Orange of
- Fit jumper to L1
L1
ORG
GRN
YEL
GRY
BLK
RED
NOTE: For 6 Wire Systems
input jack to Com1 (White) and
Com2 (Blue) of room station.
- Connect Green & Orange of
- Fit jumper to L1
POS
NEG
COM1
COM2
TC
VLC
SHLD
CH
VR3
VR2
VR1
U5
SEL
PROG
RED
BLACK
WHITE
BLUE
SHIELDED WHITE
SHIELDED RED
OUTER SHIELD
GREEN
ORANGE
Green and Orange to be taped back
at this end and also at other end.
DOOR STATION - CABLE TERMINATION
NOTE: Outer shield should
be insulated.

INSTALLATION OF MINI ROOM STATIONS
A composite 3-gang box can be used
to house the System One MINI.
1) Attach the 3-gang electrical box
to a wall stud at desired location.
2) Run Valet intercom cable
(8VM500) or Cat5 cable to all
installed room station locations.
WIRING Valet System One inter-
coms can be wired in a loop or star
style configuration. Star configuration
is also refered to as “home run”. If the
“home run” style of wiring is desired,
we recommend utilizing a structured
wiring enclosure with RJ45 style
connectors for a hassle-free installation.
ROUGH IN
Typical rough-inconfiguration
1) Attach VPS3DC Power Supply.
Requirements
A Regulated 13.8V DC power supply
is required to power the system.
The required current rating of the
supply will vary depending on the
size of the system and is equal to the
sum of the current draw of each unit
used.
CURRENT DRAW
MASTER - 350 mA peak
STATIONS - 150 mApeak
AUX O-P BOARD - 60 mA per board
An 800 mA plug pack will operate a
system comprising of 5 Room/Door
Stations.
A 2 Amp plug pack will operate a
system comprising of 13 Room/Door
Stations.
Standby Battery (Optional)
Many 15 VDC power supplies
accommodate the use of a standby
battery which may be used to allow
the entire system to run in the event
of a mains power fail.
The duration of battery backup is
dependant upon:
a) the size of battery(s) used
b) the number of stations connected
A system using a 12V 6.5AH battery
with ten stations connected to a
master will run for approximately 3 hrs
with music playing at a moderately
high volume. (6 hrs w/ music off)
POWER SUPPLY
Multiple Supplies
Multiple power supplies may be
used to provide additional current
however their output voltages need
to be identical to minimize power
losses.
Connect the Terminal block
The Terminal Block can now be
connected to the 10 pin strip
located on the back of the PC
Board.
The Terminal Block must be
connected exactly as shown in
Fig. 4. If using Valet cable, the
Red wire should be on the
bottom connector of the 10 pin
strip. Keep in mind, if using
Cat5 cable, the Orange wire
should be on the bottom
connector of the 10 pin strip. In
both instances the screws that
secure the wires into the
Terminal Block must be facing
away from the speaker.
Mount the MINI to the wall
Once the Terminal Block is
properly installed on the back of
the PC Board, the room station
can be mounted to the wall.
Attaching the System One MINI
to the mounting bracket is very
easy. Simply slide the room
station over the metal bracket
until the back of the facia is flush
with the face of the wall. (Fig. 5)
Secure the screws
& cover with end tabs
Once the facia is flush against
the wall, the screws that are
already installed in the metal
mounting bracket will need to be
tightened to hold the facia in
place.
After securing the facia to the
mounting bracket, the end tabs
that cover up the screws will
need to be snapped onto the
ends of the facia. (Fig. 6)
Fig. 4
4
5
Fig. 5
Fig. 6
6

Install the terminal block.
See Fig. 1 for how to wire the
terminal block.
Wiring configurations for Valet
Cable and Cat5 Cable have both
been provided. (Fig. 1b)
Also shown in the figure 1 is the
proper location to install the 220K
resistor. Only one resistor will
need to be installed for the system
and it is recommended that the
resistor is installed at the station
that has the power supply con-
nected to it.
Fig. 1
INSTALLATION - FINISH OUT
1Fig. 1b
Mount the metal bracket to the
3-gang box.
The metal bracket can only be
installed one way.
There is a red “UP” arrow in the
upper right hand corner of the
bracket that indicates which way
the bracket is to be installed.
The metal mounting bracket is to
be secured to the 3-gang box by
the four #6 x 7/8” screws each with
a #6 washer behind the screw.
This allows for 1/16” adjustment
for proper leveling.
Fig. 2
Bend the Tabs
The metal mounting bracket has 8
tabs along the interior perimeter of
the bracket.
Once the bracket has been securely
fastened to the 3-gang box, these 8
tabs will need to be bent 90° into
the 3-gang box opening. (Fig. 3)
These tabs are for use in a retro-fit
application.
2
Fig. 2
3
Fig. 3
The fitting of a Load Resistor to the
system is required to balance the
Voltage Control Line so that
communication is received by the
appropriate station(s).
Although a Load resistor is provided
with each Room Station, only One
Load Resistor is required for an
entire system.
The Load Resistor should be fitted at
the Room power supply has been
connected,across the VLC (YEL)
terminal and the Neg (BLK) terminal.
WIRING CONFIGURATIONS
CONTROL VOLTAGE LOAD RESISTOR
SHLD
MUS2
MUS1
COM2
COM1
AUX
VLC
TC
NEG
POS
VR1
0
NOTE: ONE
RESISTOR TO
BE FITTED AT
ONE STATION
ONLY
TERMINATION OF LOAD RESISTOR