TIRTL Technical Overview

TIRTL Technical Overview

Version 1.6

CEOS Industrial Pty. Ltd.

Unit 3, 17 Burgundy Street

Heidelberg, VIC, 3084

TIRTL Technical Overview Commercial in Confidence 2 © 2009 CEOS Industrial Pty. Ltd.

Table of Contents 1. Background.......................................................................................................5 2. Purpose ............................................................................................................5

2.1. Out of Scope ..............................................................................................5 3. Conventions Used ..............................................................................................6 4. Abbreviations ....................................................................................................6 5. TIRTL Phases.....................................................................................................8 6. Theory of Operation ...........................................................................................9

6.1. Vehicle Detection using “Beam Events” ..........................................................9 6.2. Speed and Vehicle Direction Detection ...........................................................10 6.3. Vehicle Direction Convention ........................................................................10 6.4. Lane Detection ...........................................................................................11 6.5. Axle, Axle Groups, Vehicle Detection and Wheel Size .......................................12 6.6. Classification of Vehicles ..............................................................................13

7. TIRTL Features ..................................................................................................14 7.1. Exterior Features ........................................................................................14

8. External Frame Features .....................................................................................17 9. Internal Aluminium Housing Features....................................................................19 10. Communication................................................................................................21

10.1. Serial Communications ..............................................................................21 10.2. Serial Communications Settings ..................................................................21 10.3. Fixed Line (PSTN or Leased Line) Modem......................................................22 10.4. GSM/3G Modem........................................................................................22 10.5. Antenna connection for Permanent Installations ............................................22

11. Time Synchronisation........................................................................................24 11.1. Manual ....................................................................................................24 11.2. GPS ........................................................................................................24 11.3. NTP.........................................................................................................24

12. Power.............................................................................................................25 12.1. Power Requirements..................................................................................25 12.1.1. 240 VAC Power pack supply .....................................................................25 12.1.2. Battery power supply ..............................................................................25 12.1.3. Solar Power supply .................................................................................25 12.2. Power On/Off Mode Button and Indicator LED................................................27

13. Specifications ..................................................................................................28 13.1. Technical Specification ...............................................................................28

14. Appendix 1 Serial Port Connector Pin-Outs...........................................................29 15. Appendix 2 Power Connector Pin-Outs.................................................................30 16. Support ..........................................................................................................31


Table of Figures Figure 1 – TIRTL receiver with portable sunshield .......................................................5 Figure 2 - TIRTL Beam Configuration ........................................................................9 Figure 3 - Speed and Vehicle Direction Detection........................................................10 Figure 4 – Standing behind receiver: Positive velocity for cars travelling left to right........10 Figure 5 - Lane Detection........................................................................................11 Figure 6 – Axle, Axle Groups and Vehicle Detection ....................................................12 Figure 7 - Wheel Size Measurement..........................................................................12 Figure 8 – Axle Groups ...........................................................................................13 Figure 9 - Front view of TIRTL receiver with sunshield.................................................14 Figure 10 - Top of TIRTL receiver without sunshield ....................................................14 Figure 11 - Rear of TIRTL receiver............................................................................15 Figure 12 – Exterior dimensions of TIRTL ..................................................................15 Figure 13 – Mounting positions of a TIRTL .................................................................16 Figure 14 - TIRTL External Frame front view..............................................................17 Figure 15 - TIRTL External frame rear view ...............................................................18 Figure 16 - TIRTL internal housing enclosed within external frame ................................19 Figure 17 - Internal Aluminium Housing ....................................................................20 Figure 18 - Internal housing without lid.....................................................................20 Figure 19 - RF connector positions ...........................................................................23 Figure 20 - Solar Panel installation on Jersey Barrier – Geelong Rd, Victoria, Australia .....25 Figure 21 - Solar Network example ..........................................................................26 Figure 22 – Serial Port A and B connectors as seen at the back of the TIRTL ..................29 Figure 23 – Power connector as seen at the back of the TIRTL......................................30

Table of Tables Table 1 – TIRTL exterior features .............................................................................16 Table 2 – TIRTL external features.............................................................................18 Table 3 – TIRTL housings........................................................................................19 Table 4 – Serial communications settings ..................................................................21 Table 5 – Power button and LED status .....................................................................27 Table 6 – Technical specification ..............................................................................28 Table 7 – Serial Port A and B connector pin-outs ........................................................29 Table 8 – Serial Port Connector Components list.........................................................29 Table 9 – Power connector pin-outs..........................................................................30 Table 10 – Power Connector Components list.............................................................30


Document History Item Note

1.0 This document was previously known as TSD02-01 “TIRTL Operational Specifications”.

Revision History Revision Description Date

1.0 Initial Release 23 Sep 08

1.1 Updates from internal review 24 Oct 08

1.2 Power and Solar requirements added 30 Oct 08

1.3 Minor power clarifications 12 Nov08

1.4 Updated conventions used section 6 Feb 09

1.5 Updated Solar Panel requirements for Tx 31 Mar 09

1.6 Time Synchronisation, Acronyms, and Doc History 10 Aug09

Reference Documents Revision Description

TIRTL Technical Overview

TIRTL Site Selection Manual

TIRTL Site Design Manual

TIRTL Site Construction Manual

TIRTL Site Installation Manual

TIRTL Site Acceptance Test

TIRTL Site Handover Document

TIRTL Maintenance Manual

TIRTLsoft User Manual


1. Background

The Infra-Red Traffic Logger (TIRTL) is a traffic surveillance system that is non-intrusive and capable of highly advanced functionality with features making it the most flexible ITS product in the world today.

Figure 1 – TIRTL receiver with portable sunshield

2. Purpose

This manual describes the theory of operation of a TIRTL system. It describes permanent and portable technical details.

This document is intended to be used by either CEOS technical staff, subcontractors or CEOS clients.

2.1. Out of Scope

This document does not cover the installation and configuration process, operation or maintenance. These areas are the topic of other CEOS manuals.

RX


3. Conventions Used

Several formatting conventions are used throughout this document to indicate particular types of information you may need to be aware of. Three types of information boxes are used:

WARNING Warning boxes display very important information that you should read.

NOTE General information notes, advice and links will be displayed in these boxes.

TIP Tip boxes will be used to tell you about tips or tricks that might save time or effort.

When you are instructed to click a button, it will be shown like this:

Clickable links on the page or label text will be shown in italics: Add New Forum

This shows when you could or should enter text:

Menu hierarchies will be shown like this:

URL’s will be shown like this: http://www.example.com

This shows a reference to another document: Site Selection Manual

4. Abbreviations

ACA Australian Communication Authority

ASCII American Standard Code for Information Interchange

DC Direct Current

DTMF Dual Tone Multi-Frequency

EMI Electro-Magnetic Inference

GPRS General Packet Radio Service

GPS Global Positioning System

GSM Global System for Mobile communications

GUI Graphical User Interface

IP Internet Protocol

ITS Intelligent Traffic System

LED Light Emitting Diode

Next G™ The Next G™ network is Telstra’s (Australia's) national 3G mobile network.

PC Personal Computer

PDA Personal Digital Assistant

PIN Personal Identification Number

POTS Plain Old Telephone System

PPP Point to Point Protocol

Button

Enter this text

Top menu -> Sub menu


PSTN Public Switched Telephone Network

RN Ring equivalence Number

SIM Subscriber Information Module

TCP/IP Transmission Control Protocol/Internet Protocol

TIRTL The Infra-Red Traffic Logger

USB Universal Serial Bus

UMTS Universal Mobile Telecommunications System (UMTS) is one of the third-generation (3G) cell phone technologies

WIM Weigh In Motion


5. TIRTL Phases

The phases of implementing a TIRTL and the relevant documentation are as follows:

Selection (Site Selection Manual, Site Design Manual):

1. Listing locations, through either use of on-line tools such as Google Earth, Google Maps street view or local knowledge of existing sites with suitable infrastructure to suit a TIRTL

2. Site inspections, where proposed locations are assessed for suitability against criteria listed within this document

3. Selection of the most suitable site

4. Site design, including creation of a Site Plan drawing, and a Statement of Works

Implementation (Site Construction Manual, Site Installation Manual, Site Acceptance Test):

5. Construction of the site, including civil works such as trenching and concreting

6. Installation of TIRTLs into the site, including alignment and configuration

7. Site Acceptance tests to validate that the installation is correct and operational

Commissioning and Handover (Site Handover Document, Site As-Built Drawing):

8. Monitoring of the site, and final adjustments to ensure correct operation

9. Handover of the site to the client, with appropriate documentation

Maintenance (Site Maintenance Manual):

10. Periodic assessment of the installation to perform routine maintenance

11. Calibration and certification of TIRTLs that are used for enforcement purposes.


6. Theory of Operation

A TIRTL installation consists of a transmitter and receiver pair located on opposite sides of the road. The transmitter is the source of infra-red beams used to detect traffic. The receiver detects disturbances in the infra-red beams caused by the wheels of passing vehicles, and uses intelligent software to analyse the timings of the light pulses to produce vehicle classifications.

6.1. Vehicle Detection using “Beam Events”

The transmitter emits a beam of infra-red light from each forward facing lens. These light beams overlap at the receiver, such that the light from each falls over both of the receiver’s lenses. This beam overlap yields four different paths of light from the transmitter to the lenses of the receiver, two parallel beams and two crossed beams as illustrated in Figure 2. As a vehicle passes between the receiver and transmitter, each wheel interrupts each of the four beam pathways.

Figure 2 - TIRTL Beam Configuration

Breaking of a beam is known as a “Break Beam Event” while the re-establishment of a given beam is defined as a “Make Beam Event”. In this way, with the passing of each vehicle wheel, a set of eight time-stamped Beam Events are generated from the 4 beam pathways at the TIRTL receiver. Detecting the precise time of each Beam Event allows the receiver to compute the velocity and lane of each vehicle wheel as it passes.

It is important to note that the alignment of the transmitter and receiver units is critical and that the beams traversing the roadway are set to within defined limits. This allows effective detection of vehicles without interference from mud-flaps and other features hanging from the main body of the vehicles. By use of the specialised TIRTL Optical Sights and the intelligent setup software accurate alignment during the day or night is easily achieved.

TX RX


6.2. Speed and Vehicle Direction Detection

Figure 3 illustrates a TIRTL installation on a bi-directional roadway as viewed from above. As the wheels of the vehicles interact with the 4 beam pathways, Make and Break Beam Events are generated. The speed of a vehicle is determined by the time interval measured (t1 or t2) between like Beam Events on the parallel beams, A and B.

Figure 3 - Speed and Vehicle Direction Detection

The direction of travel of a vehicle on the monitored roadway is determined by the order in which Beam Events occur. In Figure 3, A to B represents South bound traffic and B to A represents North bound traffic.

A number of redundant Beam Events are recorded in TIRTL installations. The redundant information is used to discard invalid measurements in multi-lane installations where passing traffic obscures or distorts a Beam Event associated with the target vehicle.

6.3. Vehicle Direction Convention

The convention for vehicle direction movement is:

When viewed from the rear of the TIRTL receiver positive velocity signed traffic always moves from left to the right of the unit (see Figure 4).

This is only true if the correct installation information is entered into the Site Information details. The Site Information must accurately reflect the orientation of the TIRTL units. Non-inverted operation is defined as when the TIRTL is mounted underneath a tripod. Inverted operation is typical for permanent installations.

Figure 4 – Standing behind receiver: Positive velocity for cars travelling left to right

t1

t2

A

B

RX TX

RX


WARNING When using the TIRTL system in countries that drive on the right hand side of the road, the sign of the vehicle velocity is reversed. That is, positive velocity implies right to left movement in fro not the unit.

6.4. Lane Detection

Figure 5 illustrates the principles of lane detection as implemented in TIRTL. As each wheel of the vehicle interacts with infra-red light pathway A, Ax, B and Bx, Beam Events are generated. For each class of Beam Event, Make or Break, time intervals are measured. t1 and t2 are defined as the time interval between Beam Events on beams A and Ax. t3 and t4 are similarly defined as the time interval between Beam Events on beam A and Bx. Figure 5 illustrates that there exists a quantized time difference between time interval t1 and t2 used by the intelligent software of the TIRTL receiver to learn the lane positions of the installation. The measured time intervals are normalized to the vehicle speed to provide a ratio metric measurement of vehicle position. Time intervals t3 and t4 represent an example of redundant measurement information which may be employed to verify vehicle information on a multi-lane installation.

Figure 5 - Lane Detection

Vehicle 1 Vehicle 2

Vehicle 3

A Bx Ax B

t1 t3

t2 t4

TX RX


6.5. Axle, Axle Groups, Vehicle Detection and Wheel Size

Figure 6 illustrates in more detail the process of Make and Break Beam Events. The combination of a Break Beam Event followed by Make Beam Event of the same beam occurring within a single vehicle lane constitutes the detection of an axle. Detection of axles is the first stage in the important process of vehicle classification.

Figure 6 – Axle, Axle Groups and Vehicle Detection

An “Axle Group” is defined by TIRTL as a collection of axles separated by less than a user defined maximum distance. The distance between axles is measured by knowing the speed of the vehicle, the vehicles lane location and the time taken to traverse the 4 beam pathways. For example, the maximum distance between axles for a vehicle type is user defined as 2.1m. If a distance between 2 axles was measured as less than 2.1m, the TIRTL would consider a vehicle had been detected. In the vehicles illustrated in Figure 6, each of the Axle Groups consists of 1 axle. However, for multi-wheel vehicles such as semi-trailers Axle Groups can consist of more than one axle (see Figure 8).

The wheel size of a particular vehicle class is necessarily a TIRTL learned parameter. It is necessary that this parameter is learned as the height of the beams above the road varies between TIRTL installations. Each of the infra-red beam pathways between the transmitter and receiver effectively scribes a chord across the circle of the passing wheel (see Figure 7). With the speed measurement of the vehicle, the time between the Break and Make Beam Event and the travelling lane a measure of the wheel width is obtained. This measurement can be ratio metrically used to discriminate between vehicle classes, where the vehicles have very similar wheel bases, based upon percentage wheel size variances.

Figure 7 - Wheel Size Measurement

Chord scribed across the wheel for Wheel Size

Break Beam Event

Make Beam Event RX TX


6.6. Classification of Vehicles

There are a number of different features of the wheel base of road vehicles which may be used by the TIRTL software to classify vehicles. Figure 8 illustrates these features. Classification Schemes based upon these features are built up by the user using the Classification Editor function of the TIRTLsoft GUI

A classification scheme contains a series of patterns based upon parameters associated with vehicle axles. Each pattern contains a number of parameters that uniquely describe a vehicle class. Generally, the Classification Scheme moves toward finer and finer detail for the parameters of a particular vehicle class.

Figure 8 – Axle Groups

Wheel A Wheel B Beam height above roadway clear of vehicle features such as mud flaps

Group1 Group2 Group3

Axle Spacing


7. TIRTL Features

7.1. Exterior Features

The TIRTL traffic monitoring system is designed to operate as a pair of units. A transmitter unit paired with a complimentary receiver unit.

TIRTL transmitter and receiver are similar in appearance. Figure 9 to Figure 11 and details the external features of the TIRTL receiver unit. An identifiable external difference between the transmitter and receiver is that Serial Port B is not present on the transmitter unit (item 9, Figure 11).

Figure 9 - Front view of TIRTL receiver with sunshield

Figure 10 - Top of TIRTL receiver without sunshield

4

2

1 3

5

6

RX

RX


Figure 11 - Rear of TIRTL receiver

Figure 12 – Exterior dimensions of TIRTL

12

7

8 10 9

11

14

15

16

13

82.0 mm

246.3 mm 237.7 mm

RX

RX


Figure 13 – Mounting positions of a TIRTL

Item Feature Description/Purpose

1 Top Sight Mount Machined surface and alignment pin holes on the top of the sun-shield used for accurate Optical Sight placement.

2 Top Mount Flat surface on the sun-shield used to fix TIRTL unit under a tripod or other mounting device.

3 3G/GPS Antenna Fitted if the unit has the 3G/GPS option.

4 Lens Passage for the infra-red beams.

5 Sun-shield Used for portable applications to protect against direct solar radiation exposure.

6 Mounting Boss Four large mounting points used to secure the unit to the sun-shield. Also used to securely mount the unit in a permanent installation.

7 Power Connector 5 pin external power connector and fixed line modem connection (when modem option is fitted).

8 Serial Port A 12 pin external communications connector (typically RS232).

9 Serial Port B 12 pin external communications connector (typically RS232, receiver unit only).

10 Mode Button Used to turn the unit on and off.

11 Indicator LED Conveys information regarding the current operational state of the unit.

12 Battery Door Access to the battery compartment and SIM socket for GSM operation.

13 Bottom Mount Flat surface on the base of the unit used to fix TIRTL unit on top of a tripod or other mounting device.

14 Bottom Sight Mount Position

Machined surface and alignment pin holes on the base of the unit used for accurate Optical Sight placement.

15 Housing Robust 5mm thick cast aluminium.

16 Battery Door Screws Unscrewed to gain access to the battery compartment and the SIM card socket.

Table 1 – TIRTL exterior features

109.25 mm

18.32mm

∅8 mm

157.50mm

34.00 mm

63.65 mm

3/8” thread

40.57mm

∅8 mm

3/8” thread


8. External Frame Features

The TIRTL is housed in an external housing, usually made from galvanised steel. The frame provides support for the surrounding concrete and allows a checker plate cover to be screwed onto it to further protect the External Housing and associated TIRTL.

Figure 14 - TIRTL External Frame front view

4

3

2

1


Figure 15 - TIRTL External frame rear view


1 Cover Top cover of external housing

2 Countersunk bolt M10 countersunk bolt (usually with hex security head)

3 Mounting flanges Mounting flanges with 22mm diameter holes for mounting rods.

4 Windows Infrared transmissive Acrylic windows

5 Drainage Holes Drainage holes to emit any water from housing

Table 2 – TIRTL external features

5


9. Internal Aluminium Housing Features

The Aluminium internal frame mounts within the external frame.

Figure 16 - TIRTL internal housing enclosed within external frame


1 Internal Aluminium Housing

Internal Housing

2 External frame External frame

Table 3 – TIRTL housings

1

2


Figure 17 - Internal Aluminium Housing

Figure 18 - Internal housing without lid


10. Communication

TIRTL has a number of flexible communication interfaces for remote management of the units including

• direct serial communication

• standard POTS telephone

• the mobile telephone network using GSM or 3G packet data services

• Ethernet using an external interface.

TIRTL supports two types of connection protocol via direct serial connection:

• PPP which adds extra functionality over the RS232 link including error correction, addressing and multiplexing

• raw serial communication.

All communications with the receiver use an ASCII based command set. This allows the user to access all the functionality of TIRTL unit via a simple terminal program, such as Hyper Terminal. However, the most user-friendly technique for communication with the system is by using the PC-based TIRTLsoft program.

To prevent unauthorised user access to the TIRTL, all remote sessions via POTS or mobile communications is authenticated.

NOTE The PC used to communicate to the receiver must have correctly installed drivers for the serial port and/or the POTS modem, as well as the correct version of TIRTLsoft.

10.1. Serial Communications

TIRTL is provided with a single customised Serial Cable used to provide RS232 serial connectivity into the receiver.

The serial cable with a 12 pin weatherproof connector plugs into serial port A, at the rear of the receiver. The other end of this cable is terminated with a female DB9 connector wired with a standard DTE type pin out.

NOTE When using Direct Serial communications to TIRTL via laptops it is strongly recommended that a USB to serial converter be used. Experience has shown that many laptops with standard serial ports behave in unexpected ways causing erratic behavior of the serial connection to TIRTL.

10.2. Serial Communications Settings

The serial communications setting for the laptop computer are detailed in Table 4. The default protocol for serial communications is Point-to-Point Protocol (PPP).

Table 4 – Serial communications settings

Function Setting

Bit Rate 300 to 115.2kbps (default 115.2kbps for PPP, 19.2kbps for raw serial)


Data Bits 8

Parity None

Stop Bits 1

Flow Control Hardware

10.3. Fixed Line (PSTN or Leased Line) Modem

The optional fixed line modem enables TIRTL to be accessed remotely by a standard telephone line. The modem may also be used in leased line mode.

When present, the communication lines use two of the pins on the external TIRTL receiver power connector.

The maximum data transfer rate is 33.6kbps.

10.4. GSM/3G Modem

The optional GSM unit allows wireless access to TIRTL receiver. This option requires an external antenna be fitted to the receiver.

The GSM option requires a SIM card. A SIM card holder is located in the bottom of the receiver unit battery compartment and is accessed by removing the screws holding the battery door in place and removing all batteries.

The maximum data transfer rate is 9.6 kbps GSM operation and 115.2 kbps for 3G packet data sessions.

10.5. Antenna connection for Permanent Installations

For permanent installations the TIRTL sunshield is removed and the unit is installed upside down on the flat cover plate. In this position it is not possible for the GPS/3G/GSM or 3G/GSM only antennas to be directly attached to the TIRTL body. Additionally for permanent installations, as the units are left unattended for extended periods of time, TIRTL is located in an external housing to protect the alignment of the equipment and secure the installation against vandalism. This requires that the antennas are mounted on a nearby pole with RF cables providing the connection to the TIRTL receiver. To facilitate the connection to the external antenna TIRTL is equipped with 1 or 2 (depending on the options fitted) SMA RF connectors mounted to the side of the body. The position allocation of the connectors is given in Figure 19.


Figure 19 - RF connector positions

3G/GSM Connector

GPS Connector

RX


11. Time Synchronisation

There are 3 methods to achieve time synchronisation of a TIRTL.

11.1. Manual This method involves setting the time of the TIRTL manually, connecting locally to the TIRTL and using TIRTLsoft to set the date and time. The TIRTL has an internal real-time-clock (RTC) which maintains the time when the device mains power or battery power is removed. The RTC clock battery has a life of 10 years.

11.2. GPS Installation of a GPS antenna provides the TIRTL with the ability to maintain time with Global Positioning System.

11.3. NTP The TIRTL supports Network Time Protocol (NTP) using a network and a NTP server to synchronise UTC time on numerous devices. A suitable NTP server and network must be available. CEOS does not recommend NTP over 3G packet switched networks.


12. Power

12.1. Power Requirements The TIRTL requires 12V DC via an amphenol connector (refer to Section 15 - Appendix 2 Power

Connector Pin-Outs). The three main power options include:

12.1.1. 240 VAC Power pack supply The provision of power to the TIRTLs is from a dedicated 12V DC power supply that plugs into a GPO. The power supply is typically housed within a road side cabinet nearby to the TIRTL installation, with 2.5mm2 power cables (for runs under 100m distance) to the TIRTL receiver and transmitter.

12.1.2. Battery power supply The provision of power to the TIRTLs is typically from dedicated Valve Regulated Lead Acid (VRLA)) 12V DC batteries. The batteries are housed within a separate housing or road side cabinet.

12.1.3. Solar Power supply The provision of power to the TIRTLs is from batteries that are recharged with a Solar Panel. The system is suited to remote locations where solar power provides cost benefits.

Figure 20 - Solar Panel installation on Jersey Barrier – Geelong Rd, Victoria, Australia


A typical Solar system includes

• Solar panel mounted on a tall pole

• Solar battery regulator (LVD), to prevent batteries being overcharged by the Solar Panel or totally discharged by the TIRTL

• Batteries and suitable housing

Figure 21 - Solar Network example

CEOS recommends that the following solar panel minimum wattage is used to power each TIRTL:

• Receiver TIRTL = 40W Solar Panel (minimum)

• Transmitter TIRTL = 40W Solar Panel (minimum)

Powering both Receiver and Transmitter from the same Solar Panel will require a minimum of an 80W Solar Panel.

The number of batteries to sustain ongoing power to the TIRTL is device (i.e. Transmitter or Receiver), location and weather dependent. The total amp-hours of the batteries need to be large enough to cover cloudy/rainy days (which is heavily site and panel orientation dependent).

The maintenance of a Solar Panel system typically requires battery replacement in the order of every 3 – 5 years.


12.2. Power On/Off Mode Button and Indicator LED

The button and LED combine to allow the user to turn the TIRTL on and off. If connecting active DC power from cold, TIRTL will automatically begin booting when power is applied. This feature allows the unit to power on automatically during a total power outage.

Action User Action and Response Description

Power Off Action

Press and hold Button (6 secs min)

Response

Rx – 3 flashes every 2 secs for about 15 secs

Tx – 3 flashes

Do not remove power from TIRTL until the power down sequence has completed. When the unit is on and fully operational, press and hold the button for at least six seconds to turn the TIRTL unit off. The LED will give three flashes in quick succession every two seconds until it has completed shut down (approximately 15 seconds for the receiver and almost immediately for the transmitter).

Power On Action

Press and release Button

Response (Booting)

Rx – 3 flashes every 2 secs for about 90 secs

Tx – 3 flashes

Response (Operational)

Rx – 1 flash every 30 secs

Tx – 1 flash every 30 secs

When the unit is off and still connected to power, briefly press and release the button. While the unit is booting, the LED will flash once every two seconds. When the boot cycle is complete (approximately 1.5 minutes for the receiver and almost immediately for the transmitter) the LED will flash once every 30 seconds indicating the unit is fully operational.

Debug Mode

Action

Press and hold Button (3 secs min. and 6 secs max.)

Response (Debug Mode)

Rx – flashes on/off repeatedly

This is a non-user mode that may be encountered if during power down or when fully operational the button is held for more than 3 and less than 6 seconds. In Debug Mode the LED flashes with a 50:50 duty cycle. To exit Debug Mode briefly press and release the mode button to return to the fully operational state. Then follow the standard procedure sequence for TIRTL power down.

Table 5 – Power button and LED status


13. Specifications

13.1. Technical Specification

Description Specification

TIRTL Version 2.0

Speed measurement accuracy ±1% (30 - 250km/hr, 20 – 155mph)

Maximum number left bound lanes 9

Maximum number right bound lanes 9

Max. Tx/Rx separation distance 100m / 330ft

Max Tx/Rx separation (long range optic) 200m / 660ft

Operating temperature range -40 to +85ºC / -40 to 175ºF

Environmental waterproof rating IP67 (Main body)

IP65 (Battery compartment)

EMI Rating AUNZS 55022:2000 Class B

Safety Approval AUNZS 60950:2002 compliant

DC Input Voltage 10-16 V DC

Average Rx Power Consumption at 25°C 800 mW (no traffic)

1000 mW (dense traffic)

Peak Rx Power Consumption at 25°C 2500 mW

Average Tx Power Consumption at 25°C 640 mW

Processor x486, 33 MHz

Operating System Linux (kernel 2.2)

On Board RAM 16MB

On Board ROM 8MB - 64MB

Compact Flash Storage (log storage): 1,024MB (~ 100,000 – 7M vehicles)

Communication Interfaces 2 x RS232 serial ports

GPS unit

Optional modules 3G mobile module

PSTN modem

Table 6 – Technical specification


14. Appendix 1 Serial Port Connector Pin-Outs

The connections to the serial port connector of TIRTL are described in Figure 22 and Table 7. The view of the connector in Figure 22 is that seen when looking into the connector at the back of TIRTL.

Figure 22 – Serial Port A and B connectors as seen at the back of the TIRTL

Pin Designator

TIRTL Receiver Com Port A and B

A CD

B RD

C TD

D DTR

E GND

F DSR

G RTS

H CTS

J nc

K nc

L nc

M nc

Body shield

Table 7 – Serial Port A and B connector pin-outs

Manufacturer Part Number Description

Amphenol C091 31D012 200 2 12 pin female plug for Serial Cable

Table 8 – Serial Port Connector Components list

A

H

F

D

B

C J

K

ML

E G


15. Appendix 2 Power Connector Pin-Outs

The connections to the power connector of TIRTL are described in Figure 23 and Table 9. The view of the connector in Figure 23 is that seen when looking into the power connector at the back of TIRTL.

The PSTN TIP and PSTN RING are connected if the PSTN MODEM option is fitted. If the PSTN MODEM option is not fitted these connections are not connected in the TIRTL receiver.

Figure 23 – Power connector as seen at the back of the TIRTL

Pin Designator

TIRTL Receiver

TIRTL Transmitter

1 PSTN Tip nc

2 -ve supply -ve supply

3 +ve supply +ve supply

4 nc nc

5 PSTN Ring nc

6* nc nc

* Not fitted on all units.

Table 9 – Power connector pin-outs

Manufacturer Part Number Description

Amphenol C091 31D006 101 2 6 pin female plug for Power Cable

Table 10 – Power Connector Components list

1

2

3

4

5


16. Support

Email: [email protected]

Telephone: +61 3 9458 4955

Fax: +61 3 9458 4966

Address:

CEOS Pty Ltd

Unit 3, 17 Burgundy Street

Heidelberg, VIC, 3084, Australia

Web:

www.ceos.com.au

www.tirtl.com.au

TIRTL Technical Overview

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