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Postal:                            Physical:                                     Phone:    + 61 (7) 5449 0836                  Tara Electronic Automation Pty Ltd
PO Box 1091                        2/ 26 Rene Street                             Facsimile: + 61 (7) 5474 4586                              ABN #: 21 107 645 625
Noosaville DC 4566                 Noosaville DC 4566                                                                                           ACN: 107 645 625
QLD Australia                      QLD Australia

                       TARA HOME AUTOMATION

                                TECHNICAL DOCUMENT



TARA System Technical Workbook                                                                                                                 1 of 40

1         TARA INFRANET GENERAL INFORMATION .....................................................3
          1.1         Infrared Communications                                                                                                            3
          1.2         Infrared Remote Control System Protocols                                                                                           5
          1.3         Wired Network – RS485                                                                                                              6

2         TARA INFRANET COMPONENTS........................................................................9
          2.1         Tara Infraswitch 2004                                                                                                             9
          2.1.1       Installing the Infraswitches                                                                                                     10
          2.2         IR Receivers                                                                                                                     10
          2.3         Relay Panels                                                                                                                     12
          2.4         Tara DSI Interface                                                                                                               13
          2.5         Tara Power Supply                                                                                                                15
          2.6         Tara Sentinel                                                                                                                    17
          2.7         Tara AV Sentinel                                                                                                                 17
          2.8         Tara Inframouse / Net Adaptor                                                                                                    19
          2.9         Tara Software                                                                                                                    19

          3.1         Tara InfraNet System Benefits                                                                                                    20
          3.2         Designing for an Tara InfraNet Installation                                                                                      23
          3.2.1       Lighting / Electrical Plan                                                                                                       23
          3.2.2       Tara InfraNet Receiver (IRRX) Location                                                                                           25
          3.2.3       Special Considerations for IRRX Locations                                                                                        26
          3.2.4       Network Cable Runs                                                                                                               26
          3.2.5       Tara InfraNet Switch (IRSW) Location                                                                                             27
          3.2.6       Selecting Distribution Board Locations                                                                                           27
          3.3         Summary of Installation Requirements                                                                                             28
          3.4         Relay Panel Plan – Project XYZ                                                                                                   30
          3.5         Infra Switch Plan – Project XYZ                                                                                                  31
          3.6         Material List – Project XYZ                                                                                                      32

4         INSTALLATION....................................................................................................33
          4.1         Mains Wiring to Loads                                                                                                            33
          4.2         Network Cabling                                                                                                                  34
          4.3         Terminating the Cables                                                                                                           34
          4.4         Wiring off the Distribution Board/s                                                                                              34
          4.5         Powering Up                                                                                                                      36
          4.6         Programming and Setup of the Tara Relay Panels                                                                                   36
          4.7         Testing Loads                                                                                                                    37
          4.8         Testing Network Communications                                                                                                   37
          4.9         Programming the Tara Infrared Switches                                                                                           38
          4.10        Installing the Tara Infrared Switch Units                                                                                        40


TARA System Technical Workbook                                                                                                                 2 of 40


The portion of the light spectrum IR communications use is called "infrared" since it comprises
the region between visible red and the microwave (radio) region. See Figure 1. The infrared
region is relatively wide— extending from about 0.75 micrometers to over 100 micrometers. The
most widely used infrared range for control is from 0.78 to 1.5 micrometers, or microns. The IR
transmitters and receivers used by Tara operate at 0.94 micrometers (940 nano meters).

                                                     Figure 1. Infrared energy resides between visible
                                                                 red and microwave radio.

All objects not at 0° Kelvin (absolute zero) emit energy in the infrared region. Heat travels from
one object to another via radiation, convection, or conduction. The sensation of heat is produced
by infrared energy. While conduction describes how heat moves through a solid, convection
describes how heat moves through a liquid or gas. Of the three methods, radiation is the most
powerful. Radiation moves at the speed of light and is the phenomenon we perceive in the dull
red glow of the coals in a fire or the element of an electric oven. Unlike visible light which can
be refracted, filtered, or reflected, IR propagation may be modeled by some properties of visible
light, but also propagates via radiation, convection, and conduction.
Tara uses IR LEDs as transmitters. The IR light (digitally modulated with data) travels at the
speed of light to an IR Receiver Integrated Circuit (IC). In an open area, it is possible to transmit
data a maximum distance of around 35 metres.

                                                                                                                               IR Receiver IC
    IR LED

                                                           35 metres maximum


TARA System Technical Workbook                                                                                                                 3 of 40
In enclosed areas such as rooms of a building, reflections off surfaces in the room allows the
transmitted IR to fill the area. It is possible for the IR to cover at least 30 sq metres of floor space
in this way (or a maximum general distance of 12 metres between transmitter and receiver).

Our current generation of Tara Infraswitch uses 3 IR LED to transmit the commands. This
ensures very efficient room coverage with the IR light.


TARA System Technical Workbook                                                                                                                 4 of 40

There are about five common IR remote control system protocols (RC-5, NEC, Japanese code
etc). Each utilizes some format of modulated carrier for data encoding. Virtually all equipment
manufacturers use one of the five protocols. The carrier frequency is typically between 30 – 40
KHz, with a large percentage of the remotes using 38 or 40 KHz. B & O audio systems use
carrier frequencies around 50KHz. The use of the carrier supports the ability of the receiver to
be tuned to that specific frequency, thereby enhancing the immunity of the system to external
noise or interference. Most receivers are tuned to about +/- 2 KHz of the carrier frequency. Tara
uses a carrier frequency of 30KHz.

Pulse Width Modulation (PWM) is commonly used to denote the difference between a data "1"
and "0." In other words, the ON versus OFF time for communication of a zero is specifically
different than that for a one. When the IR transmitter is actively communicating, it sends a burst
of the carrier frequency that coincides with the required ON time followed by the required OFF
time, or no burst, to signify either a one or zero. Refer to Figure 2 to see the relationship between
the basic data and the way in which it is transmitted via modulated carrier. The number of cycles
of carrier signal corresponding to the burst period representing the first part of a ONE or ZERO
may be of the same time interval with the delineation between the two being the number of
carrier cycles for which no burst is sent. The carrier burst ON time along with the carrier burst
OFF time is called a "burst pair" (this system of describing infrared data is used by the Philips
Pronto Universal Learning Remote IR Unit. It is referred to as the Pronto Hex-Code Format and
can be used to describe almost any IR code from any manufacturer)
Tara Infraswitches use a proprietary IR code that is called Tara TSR. The Tara TSR Code looks
as follows. It doesn’t infringe any other IR code copyrights and won’t interfere with other codes
such as Japanese, NEC etc.:-

                                      100 ms


                      36.9 – 68.9 ms

The first 100msec of data transmitted equals one command. This is sufficient to turn a relay on
or off for example. If the pushbutton on the Infraswitch is pressed for longer than 100msec, the
Infraswitch transmits “Repeat Commands” until the pushbutton is released. These Repeat
commands can be used for dimming functions, continuous volume adjustment is audio systems


TARA System Technical Workbook                                                                                                                 5 of 40
Now, creating an actual transmission involves more than just sending the data. Most IR
transmissions utilize a "start" pulse period to "wake up" the IR receivers and provide them the
time to adjust to the incoming signal strength via their automatic gain control (AGC) circuit.
Demodulation is optimized by setup of the system gain and this, in large part, is responsible for
the system's noise immunity. In our Tara TSR code example, the start pulse is around 3 msec

1.3       WIRED NETWORK – RS485

The IR Receivers receive the IR commands from the Infraswitch, and gate them onto the RS485
wired network. The RS485 network can be thought of as a single length of cable (max length
1,000 metres). Communication nodes (stations) (ie Tara IR Receivers, DSI Interfaces, Relay
Panels) may be located at any point along the cable. A maximum of 128 communication nodes
are allowed on any one Tara InfraNet.

                                                                  Data A            Data B

Each communication node has the ability to send and receive data on the RS485 network (ie. talk
and listen). Only one station can send data at any one time – all others must receive. If two
stations send simultaneously, contention occurs and the data is corrupted. This type of network is
classified as half-duplex.
The network cable is an industry standard known as CAT-5e. This type of cable has four (4)
twisted pairs. Two pairs are used for the data transfer (Data A and Data B), and the other two
pairs are for DC power. At the physical level, the electrical data voltages are referred to as
balanced (signal A is positive and signal B is negative). This type of data transfer method gives
very good performance in the presence of electromagnetic interference (noise).

      •    +12V DC                 - Orange pair
      •    A (RS485 +)             - Green pair
      •    B (RS485 - )            - Brown pair
      •    0V DC                   - Blue pair


TARA System Technical Workbook                                                                                                                 6 of 40
Tara InfraNet devices communicate at 57600 BAUD using a proprietary protocol with the
following features:-

     •     Multiple network master devices are allowed (as compared to a polled system where only
           one network master is allowed).
     •     Slave devices when addressed correctly by a network master acknowledge back to the
           master that the command was correctly received.
     •     Error detection is performed on all data transfers – invalid data packets are discarded.
     •     A network master retransmits a command until the acknowledgement is received from
           the slave (up to a maximum of seven (7) retransmission attempts).
     •     A maximum of 127 RS485 transceiver nodes are allowed on the network.
     •     A complete transaction on the RS485 network takes about 3 msec.

One of the advantages of the Tara InfraNet system is that the Tara IR Receivers do not have to
be configured by the installer. They may be installed as supplied from the factory. Another
feature is that several IR Receivers may be installed in a large room or area to provide full IR
coverage. In this scenario it is quite likely that two or more IR Receivers will receive the same
IR command from an Infraswitch. Each IR Receiver will subsequently gate this command onto
the RS485 network (sequentially one after the other). Such duplicate commands are
commonplace on the Tara InfraNet and are dealt with at all Tara target devices (ie. Relay

The RS485 transceivers used (MAX487) have built in failsafe pull up and pull down resistors.
These ensure that if the RS485 network is open circuit (ie idle) that it sits in a known state. Any
network master that interrogates the idle network will reliably determine it to be idle.

Terminating resistors of value 120 Ohms can be placed at each end of the network cable to
reduce reflections, although at the baud rate in use here, the terminating resistors seem to have
negligible effect. The only allowable network topology is daisy chain point to point. No loops,
stars, spurs or trees are allowed.
An RS485 network is only as good as the carrier cable. If any wires are broken, or incorrectly
terminated, the network operation will be seriously compromised.


TARA System Technical Workbook                                                                                                                 7 of 40
                                                           Star – NO!!                                        Loop – NO!!

                           Daisy Chain - OK                                                              Tree – NO!!


TARA System Technical Workbook                                                                                                                 8 of 40


      1. 1,2 and4 button versions.

      2. Two (2) x AAA alkaline batteries required. These can be accessed by removing the front
      cover of the switch with a special tool provided by TARA.

      3. Switch mechanism = industry standard tact switch (rated to 300,000 operations).

      4. Three (3) IR leds transmit commands (old design had just one). The IR window is at the
      top of the switch cover (dark area).

      5. The design and feel is similar to Le Grand range of products. This allows us to specify Le
      Grand power points.

      6. All parts are injection molded in polycarbonate or ABS. Show faces are painted in metallic
      paint, pushbutton and surrounds are chrome plated plastic.

The Tara TSR IR protocol commands may be taught to any Universal Learning Remote Control
on the market. So if a customer needs a portable IR lighting control, this is often the simplest and
most elegant solution. If security PIN coding has been applied to the Tara InfraNet system, the
learning remote control will still function correctly.


TARA System Technical Workbook                                                                                                                 9 of 40
             All infraswitches have the ability to be security coded with a PIN number. This is useful
             when an end user doesn’t want unwanted activation of network resources (ie. via an
             intruder with a Tara Infraswitch). The PIN number coding is applied to all network
             input and output devices (ie. relay panels, infraswitches etc).

             The PIN number is effectively an integer between 0 and 16,777,216.

             The Infraswitches are normally wall mounted. In the case of a new home, all other
             decoration and furnishing can be completed prior to fixing the Infraswitches to the

             In terms of positioning the Infraswitches, the location of the already installed IR
             Receivers should be kept in mind. At this point of the installation, the Tara InfraNet
             should be fully functional. So it is a simple matter of testing the switch in its desired
             location to determine if the IR coverage is adequate.


Layout requirements for the IR Receiver are shown below:-


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TARA System Technical Workbook                                                                                                               11 of 40
2.3       RELAY PANELS

Currently there are 6 and 10 channel versions of the Relay Panel. Under development is the 4
channel version. This product has the following differentiating factors from the other relay

      •    It can be mounted in ceiling cavities. This provides an optimal cabling solution –far less
           mains cable than the conventional distribution box approach, and even less cable than the
           mechanical wallswitch approach.

TARA System Technical Workbook                                                                                                               12 of 40
      •    The RP-4 can be connected on a Tara InfraNet, but it also provides a standalone solution
           ie. one RP-4 plus one or two IR Receivers (lets call this an Infra-module). No external
           power supply is needed. Several Infra-modules may be connected together to provide a
           Tara InfraNet solution – still no distribution board or external power supply needed.

The RP-6 Relay Panel requires around 300mA supply current at 12V. The RP-10 Relay Panel
requires around 500mA supply current at 12V. The relays can withstand an absolute maximum
of 10A RMS non-inductive load (ie incandescent lighting). For inductive loads (fluorescent, low
voltage with iron core transformers etc) the maximum load is 250VA.

All relay panels have the ability to be security coded with a PIN number. This is useful when an
end user doesn’t want unwanted activation of network resources (ie. via an intruder with a Tara
Infraswitch). The PIN number coding is applied to all network input and output devices (ie. relay
panels, infraswitches etc).
The PIN number is effectively an integer between 0 and 16,777,216. The default factory shipped
value is 0 (ie. no coding applied).
PIN security coding can only be applied using a laptop with the ELS Harmony software. A
Global PIN Command is sent over the RS 485 network. All Tara InfraNet devices respond to this
command and then adopt the new PIN number.


The Tara DSI Interface is used in conjunction with dimmable ballasts made by Tridonic Atco.
These are typically dimmers for low voltage lighting or fluorescent lights. The advantage of
dimming luminaries this way is that the actual dimming device is close to the luminaire being
dimmed. Also, when controlling large banks of lighting as a single control channel, multiple
Tridonic Atco dimmers can be connected in parallel. This is a more reliable approach as
compared to dimming the entire lighting bank with a single large dimmer (heat problems, longer
cable lengths, if the single dimmer fails all the lights go out).


TARA System Technical Workbook                                                                                                               13 of 40
The DSI interface is very simple. A single byte is sent from the DSI interface to the DSI dimmer
units. The byte is interpreted by the DSI dimmer as follows.
                       Byte = 0d                           Light channel is off
                       Byte = 1d                           Light channel is at minimum dimmer level
                       Byte = 255d                         Light channel is at maximum dimmer level
The DSI dimmer unit handles smooth transitions from one dimmer level to another, and soft start
to promote bulb life. The dimmer unit also filters out transients on the mains voltage, which
further improves lamp life.
The Tara DSI interface has two independent DSI output channels. Each channel can have a
maximum of 12 Tridonic Atco dimmer units connected to it.


TARA System Technical Workbook                                                                                                               14 of 40

The Tara Power Supply is a switch mode style unit with the following specifications:-

      •    125 – 240 VAC input (auto sensing and selection)

      •    47 – 60 hz input

      •    Short circuit and thermal overload proof.

      •    Output 12VDC at 2.0 amps max.

These units cannot be directly parallel connected (ie. for increased current capacity).


TARA System Technical Workbook                                                                                                               15 of 40
Correct method above for connecting multiple power supplies to a single Tara InfraNet network.
When running at full load, the power supply unit will be quite hot – this is normal. This product
is very reliable – not a single installed unit has failed.
Calculating Power Supply requirements:-

3x         RP6                     @300mA                  =           900mA
2x         RP10                    @500mA                  =           1000mA
40x        IR Rxer                 @15mA                   =           600mA
10x        DSI Int                 @0mA                    =           0mA         (DSI Int. has its own power supply)
                                   TOTAL                   =           2500mA =               2 Power Supplies


TARA System Technical Workbook                                                                                                               16 of 40

The Tara sentinel has the capacity for very advanced system functions as listed below.
The Sentinel is a supervisory control, monitoring and diagnostics device. It has the following

      •    The on-board database contains a complete map of the connected Tara InfraNet units.

      •    The status of all connected Tara InfraNet units is monitored in real–time.

      •    Can be configured by the user/installer to provide a wide variety of automation functions
           such as scenic control, timers, data logging, holiday mode, energy metering etc.

      •    Interfaces with a PC via USB and TARA software.

      •    Optionally, after a power loss the system outputs can be returned to the same state prior
           to the outage.

      •    Connecting several Tara InfraNets together in a complex Building Management System
           (BMS). A typical application would be a multistory office or complex.

      •    Connecting a Tara InfraNet to another network (ie. internet, ISDN, telephone modem).


The AV Sentinel is a device which lives on the Tara InfraNet network and converts Tara
InfraNet AV commands into IR commands specific to AV equipment devices or similar. This
allows LAN Control of these normally un-networkable devices (DVD players etc).

                                                                             IR CH 1             DVD PLAYER

      NETWORK                             TARA AV

                                                                             IR CH 2


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               Typical Installation using Tara AV Sentinel and 3rd Party AV Equipment

A standard Philips Pronto learning remote control is used to learn IR commands from IR remotes
supplied with items of AV equipment. These IR commands are stored in Pronto Hex format,
which is a shorthand method for describing any possible IR command (from any manufacturer’s
IR remote).

The Philips Pronto downloads these Hex format commands to a laptop running the ELS
Harmony software. This software has a special database for storing these HEX commands
(together with a text descriptor of the command).

A separate function in the ELS Harmony software allows for an AV Command Module to be
constructed for a given AV Sentinel (note that it is possible to install more than one AV Sentinel
per Tara InfraNet network).

The table below gives the structure for an AV Command Module.

    Tara                      AV                           Model                  Command                   Description               AV Sentinel
InfraNet AV                Equipment                      Number                                                                      IR CH (1-8)
 Command                  Manufacturer
      1                          Sharp                    ASD220                     Play                       CD                             4
      2                         Phillips                  PH3045                 Fast Forward                  DVD                             3
      3                          Bose                      BA23                    Increase                   Amplifier                        8

                                                           AV Command Module

                                                                                                       Philips Pronto

                                              Laptop with
                                             ELS Harmony
                                               software                                                                   IR command
                                                                                                                          to be learned

                                                                                                          IR Remote
                                                                                                         (ie. for Bose

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                                                       Capturing IR Commands

Once the necessary IR commands have been stored using the ELS Harmony software, it is
possible to create the AV Command Module. This is then downloaded from the laptop to the AV
sentinel over the USB link.

The AV Sentinel has a complete record of the AV Command Module stored in non volatile
memory. A field technician can download this Module to laptop for editing purposes.


The IR Mouse Net Adaptor connects via USB to any laptop or PC. The laptop or PC must have
special TARA software installed.

The IR mouse has a bidirectional IR link utilizing the Tara TSR IR Code protocol. It is powered
via the USB link, but has large internal capacitors to ensure that the transmission range is similar
to that of the Tara InfraSwitch family.

The plastic enclosure can be molded in IR transparent material, and then painted with a silver
metallic finish to just leave the IR Window exposed.


One of the main marketing features of the Tara InfraNet system is its simplicity. The software is
a fully featured and thus complicated piece of software with many functions. The user interface
however will be kept as simple and intuitive as possible. Pop-up prompts and detailed help
windows will provide the user with guidance.

The software has the following capabilities:-

      •    In conjunction with the Infra Mouse, it is possible to control any system outputs (ie
           relays, dimmers) via infrared communications.
      •    In conjunction with the Infra Mouse (Net Adapter function), it is possible to configure a
           Sentinel or AV Sentinel.
      •    In conjunction with the Infra Mouse (Net Adapter function), it is possible to run
           diagnostics on the network and connected devices.
      •    In conjunction with the Infra Mouse, it is possible to program Infraswitches, diagnose
           Infraswitch problems, and reprogram PIN security on Infraswitches as well as Tara
           InfraNet network devices.
      •    In conjunction with a Philips Pronto Pro NG teachable remote, it is possible to learn IR
           commands from any type or manufacturer’s IR remote. These commands can then be
           organized, archived and edited ready for downloading onto an AV Sentinel.


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This section assists specifiers, contractors or installers/electricians in designing cost-efficient
Tara InfraNet solutions to meet their customers’ requirements. It describes how customer needs
can be clearly understood, defined and recorded, and offers potential Tara InfraNet solutions for
buildings with various structural or interior design features.

A step-by-step approach to designing a Tara InfraNet solution is provided, and there is sufficient
information on Tara InfraNet products to allow a complete parts list to be compiled. Diagrams,
charts and worked examples of Tara InfraNet system designs are included for reference.


The Infrared light used by Tara InfraNet has no known health hazards and has no affect on other
electronic equipment (radio control devices, sensors, heart pacemakers, etc). Each signal is
uniquely programmed and cannot be interfered with by any other wireless system. The packet
protocol signal contains error detection and retransmit functions for data integrity. Other key
benefits include:

           For the system designer / project manager

      Simplified wiring schemes (since no wiring to switches is needed)
      Easy solutions to complex requirements (e.g. 2, 3 or 4-way switching, meeting switch access
      needs of elderly or disabled people)
      Avoids design restrictions from openings, fitted furniture, proximity to water outlets, etc.

           For the electrical installer

      Less non-electrical work during installation (e.g. no chasing in walls), resulting in a cleaner,
      more efficient job.
      Reduced potential for conflict with other building activities (e.g. switches can be fitted when
      all other work is complete)
      Straightforward installation and commissioning procedures, reducing stress and saving time.

           For the customer or end-user of the system

      Unrivalled flexibility to control any circuit from any location
      Easy to move or add switches to meet changing needs (can take less than 20 minutes per
      Very competitive price relative to other full-functional wireless control systems and even to
      conventionally wired installations.


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How it Works

When the button on a Tara InfraNet switch is pressed, it transmits a pre-programmed digitally
encoded infrared signal, that instantaneously spreads throughout 90% of the room (or other
similar enclosed space) in which it is located. This signal is picked up by an infrared receiver in
the room, which retransmits the signal, via the Tara InfraNet network cable, to a Central
Distribution Board containing power switching relays for the circuits controlled by the system.

There are two primary configurations for Tara InfraNet installations – Centralised and De-
centralised. In the centralised configuration all Tara InfraNet control units are installed inside
one Distribution Board.

                                        Tara Infra                  Tara Infra                 Tara Infra                  Tara Infra
                                         Switch                      Switch                     Switch                      Switch
    To Lighting Loads

          Board                      Infranet Receiver          Infranet Receiver           Infranet Receiver           Infranet Receiver

                                                          Centralised System


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In de-centralised configurations, the Tara InfraNet control units are spread over two or more
Distribution Boards on the same network. This configuration reduces power cable runs in
installations that cover large areas, or multiple floors of a building.

                                          Tara Infra                Tara Infra                 Tara Infra                 Tara Infra
                                           Switch                    Switch                     Switch                     Switch
       To Lighting Loads

            Board #1                   Infranet Receiver         Infranet Receiver          Infranet Receiver          Infranet Receiver

                                          Tara Infra                Tara Infra                 Tara Infra                 Tara Infra
                                           Switch                    Switch                     Switch                     Switch
       To Lighting Loads

            Board #2                   Infranet Receiver         Infranet Receiver          Infranet Receiver          Infranet Receiver

                                                       Decentralised System

Tara InfraNet System Limits

A single Tara InfraNet installation can operate up to the following limits:

a)         Maximum number of network
           nodes (i.e. Tara InfraNet Receivers and
           Relay Panels connected to
           the network)                                                            =           127
b)         Maximum length of network cable                                         =           1000m

If any of these values are likely to be exceeded in an installation, a separate Tara InfraNet system
is required.

Note: To estimate the number of nodes, a typical installation in a home or office uses about 1
network node per 8 square metres of floor area.

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Every Tara InfraNet Installation should have a Project Plan (as should any home automation
system). Each Project Plan should include the following elements:-

      •    Tara InfraNet Control Unit Plan (Excel spreadsheet detailing relay panels, dimmers etc).
      •    Tara InfraNet Switch Unit Plan (Excel spreadsheet).
      •    Tara Materials List.
      •    Electrical / Lighting Plan (softcopy CAD drawing or paper plan).
      •    Project correspondence.
      •    A revision / upgrade list to track the history of the project.

The Project Plan when complete is useful for:-

      •    Work planning, estimating and costing
      •    Creating an order list for Tara InfraNet components
      •    Defining circuit and relay identification codes
      •    Defining a switch programming plan
      •    Recording the as-built system for future reference if system expansion or up-grading is
           required at a later date.

The following sections offer procedures for creating the Project Plan.

             3.2.1 LIGHTING / ELECTRICAL PLAN

             A good quality Lighting / Electrical Plan must be obtained from the architect /
             developer. This should show the location and type of electrical loads to be controlled by
             the Tara InfraNet System.

             The following items must be added to the Lighting / Electrical Plan.

                   •     Location of the Tara InfraNet Receivers
                   •     Location and type of Tara InfraNet Switches
                   •     Location of the Tara InfraNet Distribution Board (more than one in the case of a
                         decentralised Tara InfraNet Installation).

             The floorplan on the next page shows the relationships between the main elements of a
             Tara InfraNet system. This plan shows the minimum of information that must be
             recorded on the plan.


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             Note that the above plan shows that each electrical load has been assigned a unique
             number (Electrical Circuit ID Number).


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             The position of the Infrared Receivers is important for successful operation of the Tara
             InfraNet system. Determining proper Infrared Receiver location is described in detail in
             the next section.

             The network data cable (recommended Cat 5e - four pair) is shown linking the Infrared
             receivers to the Tara InfraNet Distribution Board. The only acceptable network
             topology is daisy chain (ie. point to point with no loops, stars, tree arrangements etc).


             Full room (Omnidirectional) infrared coverage is provided by the Tara InfraNet system
             provided the following design rules are followed.

             a)       Allow at least one IRRX per room, corridor or open area. In larger areas, more
                      than one IRRX will be required.
             b)       The maximum unobstructed distance between IRRX and any Tara InfraNet
                      Switch (IRSW) is 8 metres. Operating distances of 12 – 15 metres may be
                      possible, but not recommended for reliable operation.
             c)       For rooms with normal ceiling height (approx 2.4 metres), each IRRX covers
                      about 30 m2.
             d)       Locate all IRRX units where they will not be exposed to strong sources of light or
                      heat ie. direct sunlight, heater lamps, fluorescent lights, up lights, chandeliers etc.

             e)       For large areas (ie. larger than 30 m2), several IRRX units will be required. Place
                      them a maximum of 6 metres apart.


                                                                 6m                                     6m

                                            IRRX                                                                          IRRX
                                                                               Plan View


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             a)       IRRX units are flush mounted and require a cavity approximately 35 mm diameter
                      and 50 mm deep. In solid ceilings make allowance for channeling and trunking of
                      network cable runs.

             b)       Full room coverage (omnidirectional) is only possible with infrared transmission
                      when reflections are possible of the infrared signal from walls, furniture etc. Some
                      surfaces reflect infrared light poorly:-
                      •       Glass
                      •       Textured or pleated fabric (ie curtains)
                      •       Walls painted in dark colours
                      •       Natural wood and fibre

             c)       In rooms / areas with large amounts of the above, a plain line-of-sight
                      arrangement between IRSW and IRRX is necessary, and ensure that they are less
                      than 8m apart.

             d)       Beams, columns, alcoves, atriums, overhead platforms, galleries etc may
                      potentially obstruct the infrared transmission. These architectural features must be
                      considered when deciding on both IRSW and IRRX location. If in doubt, ensure a
                      plain line-of-sight arrangement between IRSW, and ensure that they are less than
                      8m apart.

             3.2.4 NETWORK CABLE RUNS

             The recommended network cable is Cat 5e (four twisted pairs). Key guidelines for
             defining network cable routing are:

             a)       To minimise electromagnetic interference on the network, do not route the cable
                      close to and parallel to, mains power cables. In any situations where network
                      cables must run parallel to mains cable, a gap of at least 300 mm must be allowed.

             b)       Route the cable away from areas where it could be damaged by other construction
                      or building maintenance activities.

             c)       Ensure that the actual network cable locations are marked on a building plan. This
                      makes system fault-finding, maintenance and upgrades much easier.


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             Each Tara InfraNet Switch should be shown on the Electrical / Lighting Plan, and
             labelled with a unique identifier (ie. S1). The number of buttons required on the IRSW
             should also be shown on the plan.

             One of the design features of the Tara InfraNet system relates to the flexibility of IRSW
             unit placement. After installation, the position of IRSW units can be altered, and new
             units added, without the need to alter or add any system cabling.

             The preferred switch locations should be discussed with the customer to identify not
             only how they would meet existing control needs, but if possible, how these needs could
             change in the future. This information will help define the optimum location of Tara
             InfraNet Receivers. The customer should be reminded that Tara InfraNet switches can
             be placed in any convenient location.

             In addition, the following general factors should be considered when specifying switch

             a)       Avoid very humid locations, for example in a shower cubicle, on the outside
                      surface of an exterior wall, over steam generating equipment in a kitchen, etc.

             b)       Avoid locations where the signal from the switch is likely to be blocked from
                      penetrating into the room or other space.


             One or more Distribution Boards are required in each Tara InfraNet Installation. As a
             general rule, installations of up to 150 m2 of floor space require just one Distribution
             Board. Larger installations may require several Distribution Boards. The reason for this
             is to minimise the length of mains wiring required between Loads and the Distribution

             The key factors to consider when selecting a location for a Distribution Board are:-

             •        Easy access to electricity supply cables.
             •        Central location with respect to the loads to be connected to it, so that the total
                      length of power cable runs are minimised.
             •        There must be sufficient space to mount the Distribution Board, and provide
                      comfortable working access.

             Power cables to lights and other electrical loads that are controlled via Tara InfraNet
             radiate in a “star” configuration from the Distribution Board.


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Infrared Receivers

Define the number of Infrared Receivers required. If in doubt, specify extra IR Receivers.
Having to retrofit them later is an expensive option. Pay close attention to areas where infrared
reception may be a problem.

Infrared Switches
For quotation purposes, the quantity and type of IR switches specified should be as accurate as
possible. From an installation point of view, adding extra switches (not specified in the Project
Plan) is problem free. This is because the extra switches do not impact on any other aspect of the
system design or installation procedure.

The planned position of the IR switches must take into account the location of IR Receivers (for
optimal IR reception).

Power Supply Units (+12VDC)
Calculate the number of Power Supply units required. At least one Power Supply unit is
required in each Distribution Board. Thereafter an additional Power Supply unit is required for
each additional 2A of current required by Satellite receivers and control panels on the network.
(Each Power Supply unit has a rated maximum of 2A DC).

           eg. Power Supply Requirements – Distributed System

Distribution Board A

   Quantity                      Description                                   Amps reqd / Unit                     Line Total (Amps)
     16                            IR Rxers                                         0.02                                  0.32
      3                      RP10 (10 Relay Panel)                                   0.5                                   1.5
      2                       RP6 (6 Relay Panel)                                    0.3                                   0.6

                                                                                TOTAL                                     2.42 Amps
                               Distribution Board A                         Power Supply Units                             = 2 Units

Distribution Board B

   Quantity                      Description                                   Amps reqd / Unit                     Line Total (Amps)
      2                      RP10 (10 Relay Panel)                                   0.5                                   1.0

                                                                                TOTAL                                      1.0 Amps
                               Distribution Board B                         Power Supply Units                              = 1 Unit


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Distribution Board Size and Layout

Calculate the size of each Distribution Board. A general rule of thumb is that biggest is best.
The Distribution Board must have sufficient length of DIN rail to carry the Control Panels,
Power Supply(ies) and circuit breakers, and to have one spare DIN rail or at least a 25% margin
in DIN rail length, to accommodate future up-grades or expansion of the installation.

Handling Changes to Requirements

Even if great care is taken to define the system requirements early in the project, changes may
still be requested during later stages of the design process or during actual installation.

Generally, moving the location of switches or changing the circuit that a switch controls has very
little impact on the installation, even when complete. Changing the location of, or adding lights
(or other devices), IR Receivers and Relay Panels however, can be very costly. It is
recommended therefore that special attention be paid to these items during the specification and
planning stages of the project.


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The Relay Panel Plan details the location of each Relay Panel (ie Distribution Panel), the
assigned Unit Number (which will be programmed into each unit during the installation), and the
connected Electrical Circuits.

Dist Board Unit #                       Channel              Electrical Circuit              Location                Load

       A                 1                    1                           1                  Bathroom 2              Ex Fan
       A                 1                    2                           2                  Bathroom 2              Lights
       A                 1                    3                           3                  Dining                  Lights
       A                 1                    4                           4                  Dining                  Ceiling Fan
       A                 1                    5                           5                  Kitchen                 Ex Fan
       A                 1                   6                           6                   Kitchen                 Lights
       A                 1                    7                           7                  Breakfast               Ex Fan
       A                 1                    8                           8                  Breakfast               Lights
       A                 1                   9                           9                   Garage                  Lights
       A                 1                   10                          10                  Living                  Lights

       A                 2                    1                          11                  Living                  Lights
       A                 2                    2                          12                  Entrance                Lights
       A                 2                    3                          13                  Entrance                Lights
       A                 2                    4                          14                  Porch                   Lights
       A                 2                    5                          15                  Balcony 1               Lights
       A                 2                    6                          16                  Bedroom 1               Lights
       A                 2                   7                           17                  Robe 1                  Lights
       A                 2                    8                          18                  Ensuite 1               Ex Fan
       A                 2                    9                          19                  Ensuite 1               Lights
       A                 2                   10                          20                  Bedroom 4               Lights

       A                 3                    1                         21                   Bathroom 1              Ex Fan
       A                 3                    2                         22                   Bathroom 1              Lights
       A                 3                    3                         23                   Bedroom 3               Lights
       A                 3                    4                         24                   Hall 1                  Lights
       A                 3                    5                         25                   Bedroom 2               Lights
       A                 3                    6                         26                   Ensuite 2               Lights
       A                 3                    7                         27                   Ensuite 2               Ex Fan
       A                 3                    8                         28                   Balcony 2               Lights
       A                 3                    9                        Spare
       A                 3                   10                        Spare


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The Infra Switch Plan relates each pushbutton on the Infra Switch Units to a particular channel
on a Control Panel. The Infra Switch Plan will be using during installation to provide the
information for programming the Switch Units.

Location                 Switch #             Button #             Unit #          Channel             Circuit          Load

Bathroom 2               Switch 1              BTN 1                           1 -2                                 2 Lights
                                               BTN 2                           1 -1                                 1 Ex Fan

Dining                   Switch 2              BTN 1                           1 -3                                 3 Lights
                                               BTN 2                           1 -4                                 4 Ceiling Fan

Living                   Switch 3              BTN 1                           2 -1                               11 Lights
                                               BTN 2                           1 - 10                             10 Lights

Kitchen                  Switch 4              BTN 1                           1 -6                                 6 Lights
                                               BTN 2                           1 -5                                 5 Ex Fan
                                               BTN 3                           1 -3                                 3 Lights (Dining)

Kitchen                  Switch 5              BTN 1                           1 -6                                 6 Lights
                                               BTN 2                           1 -5                                 5 Ex Fan

Breakfast                Switch 6              BTN 1                           1 -8                                 8 Lights
                                               BTN 2                           1 -7                                 7 Ex Fan

Living                   Switch 7              BTN 1                           2 -1                               11 Lights
                                               BTN 2                           1 - 10                             10 Lights
                                               BTN 3                           3 -4                               24 Lights (Stairs)

Entrance                 Switch 8              BTN         1                   1   - 10                           10    Lights (Living)
                                               BTN         2                   2   -1                             11    Lights (Living)
                                               BTN         3                   2   -2                             12    Lights (Entrance)
                                               BTN         4                   2   -3                             13    Lights (Entrance)
                                               BTN         5                   1   -9                              9    Lights (Garage)
                                               BTN         6                   2   -4                             14    Lights (Porch)

Garage                   Switch 9              BTN 1                           1 -9                                9 Lights (Garage)
                                               BTN 2                           2 -4                               14 Lights (Porch)


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The Material List details the complete Tara InfraNet equipment requirements for a project.
Related materials such as lighting and data cable may also be recorded on this list.

                       Qty          Units Item                                            Cost/Unit            Line Total

                        3                     Tara RP 10 Board                             $                    $
                        1                     Tara Power Supply                            $                    $
                        18                    Tara IR Receiver                             $                    $
                        25                    Tara IR Switch                               $                    $
                       360            m       Light Cable                                  $                    $
                       140            m       Cat 5 Data Cable                             $                    $

                                                                                          TOTAL                 $


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This chapter covers the Installation and Setup of a basic Tara InfraNet System. A single phase
power implementation is shown.

Prior to installing a Tara InfraNet System, it is important that an Electrical Layout Plan has been
first designed and drafted by a competent professional. Correct planning and layout will ensure
optimal performance of the Tara InfraNet System. The Electrical Layout plan should include the
following elements:-

        •    Location and type of all lighting and other loads.
        •    Location of Distribution Board/s where Tara Relay Panels will be located.
        •    Approximate cabling paths from Distribution Board/s to loads.
        •    Layout plan for each Distribution Board showing positions for din rail mounted Circuit
             Breakers, Tara Relay Panels, Dimmers and Power Supplies etc.
        •    Location of Tara Infrared Receivers
        •    Network cabling path from Distribution Boards to Tara Infrared Receivers.
        •    Location of Tara Infrared Switches.
        •    A table listing the load that each Tara Infrared Switch pushbutton must control.


The first step of the installation is to wire up the loads that will be connected to and controlled by
the Tara InfraNet System.

Either single cored active cabling, or twin core plus earth cable can be used to connect the loads
to the Distribution Boards. If using twin active core cable to wire nearby loads (for example
Bathroom Light plus Bathroom Exhaust Fan), first check that both loads terminate at the same
Distribution Board.

Run all of the load cables. At the Distribution Board end, allow at least 1.5m of extra cable
length. Use the supplied cable adhesive labels to mark the cables as per the Electrical Layout
Plan (Circuit 1, 2 etc). The mains feed cables from the Power Board can also be run at this time.


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The recommendation for the Network Cabling is CAT5e (four twisted pairs). This connects all
Tara Infrared Receivers and Relay Panels in a daisy chain (point to point) fashion. There must be
no closed loops, spurs, branches etc.

Install the network cabling. At each position where a Tara Infrared Receiver is to be located, fold
the cable back on itself, allowing at least 500mm of free length (to protrude from the hole in the

At the Distribution Board end, allow at least 1.5m of extra cable length.


When appropriate (ie. after wall cladding, plastering, painting etc is complete), the mains and
network cables may be terminated.

The loads should be terminated as per any standard installation.

For the Tara Infrared Receivers, follow the Installation and Operating Instructions that were
supplied with the units. Until the system is powered up and tested, it is wise to leave the
terminated Infrared Receivers hanging at the end of the network cables.

Note that a pair of wires from the CAT5e cables are used for each of the four (4) terminals at the
back of the Tara Infrared Receivers.

When the Tara Infrared Receivers are installed in their final positions, ensure that the arrow on
the unit points towards the location of the associated Tara Infrared Switch. This provides the
optimal angle for infrared reception. (This note only applies to ceiling mounted Tara Infrared
Receivers. For wall mounted Tara Infrared Receivers, the direction of the arrow is of no


Install all Circuit Breakers, and all Tara InfraNet Components in the desired positions in the
Distribution Board/s (ie. clip onto the din rails).

The cables may be broken up into several classifications. It is recommended to wire them off in
the following order:-

1) Mains Feeds (active to circuit breaker inputs, neutral to neutral bar and earth to earth bar).
2) Active Inputs to Tara Relay Panels, Power Supplies etc.
3) Neutral Inputs to Tara Relay Panels, Power Supplies etc.


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4) Active Outputs to Loads. Ensure that cable markers are once again used to label each load
   wire (Circuit 1, 2 etc).
5) Neutral and Earth wires to respective bars.
6) DC power connections (+12V and GND) from the Tara Power Supply/s to each Tara Relay
   Panel in the Distribution Board (connected daisy chain fashion).
7) Network connections to all Tara Relay Panels (connected daisy chain fashion).
8) Network cable GND and +12V wires connect to Tara Power Supply. This supplies power to
   the Tara Infrared Receivers.

In some installations, there will be more than one Distribution Board needed to house the Tara
InfraNet Components. This means that more than one Tara InfraNet DC Power Supply will be
required. Please refer to the Installation and Operating Instructions for the Tara InfraNet DC
Power Supply. This shows how the +12VDC and GND connections must be arranged.

When two or more Tara InfraNet DC Power Supplies are used in one installation, the 0V (GND)
terminals MUST be connected together. This connection may be via the network cable, or via a
dedicated single core cable.

When two or more Tara InfraNet DC Power Supplies are used in one installation, the +12V
terminals must NEVER be connected together. With this in mind, care must be taken in wiring
the DIN rail enclosures as well as the network cabling.

The recommended cable duct to be used is shown below. Ideally it should be 65 mm high and 25
mm wide, with narrow slots.


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4.5        POWERING UP

Once all of the wiring has been completed, AND it is safe to do so, power up the Distribution
Board/s for the first time.

      The Green “Power” LED on each Tara Relay Panel, Dimmer, Fan Controller etc should light.

If this is not the case, immediately power down, and search for the problem.


1.         The green “Power” led on each unit has light up.

2.        Each Tara Relay/Fan/Dimmer unit in the installation must be programmed with a unique
          identity. Press and hold the “Prog” button using a pen or similar.

3.         After 5 sec. the “Unit #” led will light.

4.        Use the “Prog” button to enter the desired Unit Number for this unit (ie for Unit # = 5
          press the button five times). The Unit Number for each device should be shown on the
          Electrical Layout Plan.

5.         The “Unit #” led will now flash to confirm the selection.

7.        After a short delay, the “Unit #” led will go out. The unit is now ready for network
          operation. Use a stick-on label to mark the front panel with the Unit Number.

NOTE: To confirm the Unit Number at any time, press the “Prog” button briefly. The “Unit #”
led will then flash to show the Unit Number value.

The Unit Number is retained in non-volatile memory even when power is removed from the unit.


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4.7        TESTING LOADS


To enable testing of individual loads etc during installation, the following easy to use diagnostic
functions are provided on each Tara Relay Panel, Dimmer Unit, or Fan Panel :-

1.        Press and hold the “Prog” button using a pen or similar.

2.        After 5 sec. the “Unit #” led will light. Continue to press the “Prog” button. After 10 sec.
          the “Unit #” led will flash twice. The unit is now in Diagnostic Mode. It is offline and
          will not respond to Network communications at this time.

3.        Note that Relay 1 has been switched on. Each quick press of “Prog” will select the next
          step in the sequence.

4.        The sequence is one relay on at a time, then all relays ON, then all relays OFF, then back
          to the start of the sequence. Press “Prog” to cycle through the steps of the sequence.

5.        To exit Diagnostic Mode, press and hold “Prog” for 3 secs. When the “Unit #” led goes
          off, the unit is back in normal operating mode and is ready for network communications.


Prior to testing Network Communications, first ensure that the Distribution Board is powered up
and all Tara Relay Panels have been correctly programmed.

Each of the Tara Infrared Receiver Units will now be tested to ensure correct operation. At the
same time, the correct operation of the Network Communications will also be verified.

Stand close to a Tara Infrared Receiver Unit, and perform the following procedure with a
Tara Techaid Unit. Repeat this procedure for all Tara Infrared Receiver Units in the installation.

Network Loopback Test:


When this command is invoked, the following sequence takes place:-

1/. A Network Loopback IR command is sent.
2/. The IR command is received by any IR Receivers in the vicinity.
3/. The IR Receiver gates the command via the network to the intended Relay Panel.
4/. The Relay Panel echoes the command via the network back to the IR Receiver.
5/. The IR Receiver flashes its LED to indicate the result.


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1/. Press the Network Loopback button X times, where X is the Unit Number of the destination
    Output Device (eg. Relay Panel)

2/. The Red LED will flash to confirm the selection.

3/. After a delay of not more than a few seconds, there are three possible outcomes.

               i)          The IR Receiver LED does not flash. This means the IR Receiver may be
                           faulty, the network power is off, or the network wiring is incorrect.

               ii)         The IR Receiver Led gives a single brief flash. This means the destination
                           Output Device doesn’t exist, or the network is not functioning.

               iii)        The IR Receiver LED flashes 3 times. This means the loopback test was


The quickest way to program and verify the operation of the Tara Infrared Switches, is to take
all of them, plus a Tara Techaid, and work close by the Distribution Board (the following
procedure assumes that a Tara Infrared Receiver is located near to the Distribution Board).

Ensure that all of the Tara Infrared Switch Units have had batteries correctly installed.

Refer to the table on the Electrical Layout Plan that describes the load that each Tara Infrared
Switch pushbutton must control (ie. Relay Panel Number / Relay Number).

After the Easy Setup procedure is performed for each Tara Infrared Switch, verify that each
pushbutton operates the correct relay. The label on the side of the Tara Infrared Switch should
then be carefully marked with the appropriate information.

InfraSwitch Easy Setup:


This is a method for rapidly programming the Unit Number and Channel Number of IR Switch


1. Press the Easy Setup pushbutton on the Techaid. The Red LED will light.

2. Press and hold any pushbutton on the Infrared Switch Unit for 1 sec.

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3. The Yellow and Green LEDs on the TechAid will flash in sequence. The Switch Unit is now
   in SET-UP MODE.

4. Release the pressed button - the Green LED will light.

5. Select a pushbutton (can be any one), and enter the UNIT NUMBER as a series of keypresses.

6. After a brief pause, the Green LED will confirm the selection.

7. For the SAME pushbutton, now enter the desired CHANNEL NUMBER as a series of

8. After a brief pause, the Yellow LED will confirm the selection.

9. The Green LED will light again. Choose another pushbutton, and repeat steps 5 - 8. Keep
   repeating till all pushbuttons are programmed.

10. After a 5 sec pause with no keypresses, both LEDs will go off. This means the Switch Unit is
   ready for operation.

IR Test Go / No Go:


This function can be used to test whether an IR Switch is functioning correctly, or the maximum
IR transmission range etc.


1. Press the IR Test Go / No Go button. The Green and Red Leds will flash in sequence.

2. When a valid IR command is received, the Green LED will flash.

3. When a Security ID Coded or corrupted command is received, the Red LED will flash.

4. The TechAid powers down automatically after 6 mins.

IR Test Button Info:


This function can be used to check the command parameters for an IR Switch.


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1. Press the IR Test Button Info button. The Green and Yellow Leds will flash in sequence.

2. When a valid IR command is received, the Green LED will flash to indicate the UNIT
   NUMBER, followed by the Yellow LED which will flash to indicate the CHANNEL

3. The TechAid powers down automatically after 6 mins.


The Tara Infrared Switch Units may be installed by screwing them to the wall, or using double
sided tape etc.


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