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TIRISTechnology by

Texas Instruments-

Automatic Vehicle Identification

System Installation Guide 915 MHz Band

INSTRUMENTS^

PartNumber MNL915-0001

Part No. MNL915-0001

First Edition, May 1995 Revision A, November 1995

The first edition describes installation of the following:

Part Number • 30-Degree Antenna ANT915-0020 • Transceiver RDR915-0004 • Transceiver w/Help RDR915-0504 • Junction Board JCT100-0002 • Reader Controller Card RCC100-0006

• 30-Degree Antenna w/Transceiver AWT915-0100 • 22-Degree Antenna ANT915-0019 • 22-Degree Antenna w/Transceiver AWT915-0090

Copyright ® 1995 Texas Instruments Incorporated. All rights reserved.

Table of Contents

1 AVI System Overview ................................................1 AVI system scenario...... _._ ..........................3 Partssupplied........................_... .................4 Parts required but not supplied .....................6

Cabling............................... _.............6 DC power supply for the transcetv& .._..._.........10 Bracket(s) for mounting the antenna._.._.........10 Tools for installing .........................._....__........_..11 Terminal emulation software for monitoring.................................................._.._..._l 1

PartsSummary ...............................................---.....12 2 Installation ................................... .........................._..15

1. Install the antenna assembly ................................16 2. Connect the junction board ................................25

Junction board connections ................................27 J1–Reader Controller Card .................................30 J2–RS422 lane controller (optional) ...................31 J3 and J4–next and previous RCC (optional) .............................................................3 2 J5–monitor port ................ 33 .................................. J6–LED status display ..........................................3 4

3. Connect the RCC ................................................35 RCC power supply connections (optional) .......36

4. Switch on the power ............................................37 5. Shut down the system .........................................41

3

Maintenance ..............................................................43 Servicing....................................................................45

Appendix A: Antenna Alignment-Single Lane ..............A-1 Determining the RF read area ..................................A-2 Aligning the signal laterally .......................................A-5

Appendix B: Antenna Alignment-Multiple Lanes ........B-1 Determining lane discrimination ..............................B-2 Aligning the signal laterally .......................................B - 3

Appendix C: Polling Sequence .......................................0-1 Scenario 1—Open Highway .....................................0-2

November 1995 AVI System Installation Guide

Appendix E: Monitor Personality t-unwi .-' • • • • • • --

AVI System Installation Guide Nov bar>9.9

A

Scenario 2—Toll Plaza ...............................................0-4 Appendix D: Optional Test Transponder .....................D-1 Appendix E: Monitor Personality Commands ..............E-1

ii AVI System Installation Guide November1995

Illustrations

Figure 1. OSHA-defined danger zone ......................iv Figure 2. AVI system scenario ....................................3 Figure 3. AVI system parts .........................................5 Figure 4. Fiber optic cable connectors .......................8 Figure 5. Multi-lane system configuration ...............9 Figure 6. Antenna front-roadside view ..................16 Figure 7. Antenna assembly (back) ...........................17 Figure 8. Antenna assembly (profile) ........................ 17 Figure 9. RF transceiver .............................................18 Figure 10. U-bolt placement-aerial view ...................19 Figure 11. Attaching U-bolts-side view ....................20 Figure 12. Axes defined ...............................................20 Figure 13. Fiber optics cabling connection ..................21 Figure 14. Option 1: Full sensing wiring .....................22 Figure 15. Option 2: No sensing wiring ......................23 Figure 16. The breakout box .......................................24 Figure 17. Junction board ............................................25 Figure 18. Junction board dimensions ........................26 Figure 19. Junction board connections .......................29 Figure 20. Reader controller card ...............................3 5 Figure 21. Junction board to port connection............37 Figure 22. Microsoft Windows terminal window....... 37 Figure 23. OSHA-defined antenna danger zone........38 Figure 24. Check voltage at antenna ...........................3 9 Figure 25. Test beeper transponder ............................40 Figure 26. PC to RS422 to J2 connection ....................41 Figure 27. Locating the dip switches in the RF

transceiver ...................................................4 5 Figure A-1. Axes defined ...............................................A -2 Figure A-2. Finding the boresight .................................A -3 Figure A-3. Reading the field strength using the

continuous read test tag .............................A -5 Figure A-4. Sample alignment scenario .........................A -7 Figure A-5. Top-down view of alignment

scenario .......................................................A -8

November 1995 AVI System Installation Guide ii

Table C-1. Open highway polling sequence example.......................................................0-2

Table C-2. Toll plaza polling sequence example..........0-4 Figure D-1. Test beeper transponder ............................D-1 Figure D-2. Walking test transponder through

testarea .......................................................D-2

iv AVI System Installation Guide November1995 II'

Tables

Table 1. Dimensions of parts supplied ....................2 Table 2 Parts supplied .............................................12 Table 3. Other parts required but not

supplied ......................................................13 Table 4. Cabling required but not supplied............13 Table 5. Cable to the antenna power with

sensing............................ .............................22

Table 6. Cable to the antenna power with no sensing.........................................................23

Table 7. Jumper settings for different cable

lengths......................................................... 2 7 Table 8. 68-pin SCSI pin assignments .....................30 Table 9. RS422 pin assignments ...............................31 Table 10. Junction board to junction board

cable pin assignments .................................32 Table 11. Wiring assignments for RCC-to-

monitor cable ..............................................3 3 Table 12. LED status display pin assignments...........34 Table 13. RCC power supply pin assignments..........36 Table 14. LED status display pin assignments...........44 Table 15. RF transceiver dip switch settings ..............46 Table A-1. Alignment parameter values ......................A -8 Table E- 1. Monitor commands that do not have

parameters ..................................................E -1 Table E-2 Monitor personality commands that

have parameters ..........................................E -2

November 1995 AVI System Installation Guide v

R C

j C R

danger zone

Figure 1. OSHA-defined danger zone

When the antenna is powered on, no personnel should be within a radius of 1 meter of the antenna front U

Caution: When the antenna is powered on, DO NOT go closer than 1 meter.

For health and safety reasons, the U.S. Office of Safety and Health Administration (OSHA) has determined that it is hazardous to be within a one-meter range of high frequency electronics, such as the antenna front, when powered on. OSHA regulations stipulate that, for individual health and safety, no one should enter the region shown in the illustration when the antenna is turned on.

AVI System Installation Guide November1995

AVI System Overview

1 AVI System Overview

The Automated Vehicle Identification (AVI) System is a 915 MHz back- scatter radio frequency system designed to asust in the automation of toll collection for transpor-tatiwn agencies.

Each AVI system, one per lane, consists of

• an antenna assembly

• a junction board

• a reader controller card (RCC)

The avtmna assembly includes the 902-928 MHz dual-aperture antenna array with an opening angle of 30 degmes* in the E-plane. The assembly also includes a 915

MHz transceiver unit mounted over the lane. The antenna, weighing approximately 90 pounds, and tiansceiver are usually shipped fully assembled. However, the antenna can be ordered separately.

Now Instructions in this installation guide also apply to installing 22-degree antennas, except when establishing the read footprint. (See Appendix A.)

The junction board, which often is housed with other electronics alongside the road, connects the antenna assembly to

• a reader controller card

• a lane controller (optional)

• other junction boards (optional)

• a computer monitor (optional)

• an LED status display (optional)

Each antenna is connected to a junction board using a-'

* fiber optic cables. The degree of the opening angle is depeade t on the antenna application.

November 1995 AVI System installation Guide

AVI System Overview

AVI system 'scenario

The AVI system can be configured several ways, one of which is illustrated in Figure 2.

Figure 2. AVI syStem Soeio

This is how the AVI system wales I

11w sego^mce of events in this scenario is

1. 11w AVI transponder, a radio frequency ID tag, is attached to the vehicle.

The transponder can be placed inside the vehicle on the drives side of the windshield. Or, using a specially designed transponder for attaching to the vehicle's exterior, the transponder can be placed on the license plate or other external surface.

2. The antenna system sends a radio signal to the AVI transponder and receives a response. The antenna system may also write data back to the transponder, for example, the time and place of entry.

3. The receiver, which usually sits on the roadside in a box, collects data and transmits information back to the central computer.

November 1995 AVI System Installation Guide 3

AVI System Overview

The RCC is a high-speed, RISC-based card that is plugged into the lane controller computer for bus speed operations. Or, the RCC can be connected by an RS422 interface to a lane controller computer. Upgradeable software is supplied on a 3.5-inch disk.

The RCC controls all the communications to and from the transponders mounted in vehicles. It also controls the communications with the lane controller.

The following are dimensions for the antenna assembly, junction board, and RCC:

Part I Wetulu Width I teth Itetht Antenna - Assembly

Antenna 80 lbs 36318- 42 3" 10 7/16" NEMA 4 enclosure n/a 16" 24 5"

RF transceiver 10 lbs 20" 10" 21/4 "

(3" for clearance)

U-bolts n/a 2 1 /2 " 5" n/a inside ends

Junction Board 1 lb 5 1 /2 " 4' n/a + connectors

RCC 1lb6oz 4 131/2' 4/5"

Table 1. Dimensions of parts supplied

These are the dimensions for the antenna, transceiver, junction board, and reader controller card.

AVI System Installation Guide November 1995

AVI System Overview

AVI system 'scenario The AVI system can be configured several ways, one of which is illustrated in Figure 2.

Figure 2. AVI system scorwi, This is how the AVI system woi

The sequence of events in this scenario is

1. The AVI transponder, a radio frequency ID tag, is atached to the vehide.

The transponder can be placed inside the vehicle on the driver's side of the windshield. Or, using a specially designed transponder for attaching to the vehicle's exterior, the transponder can be placed on the license plate or other external surface.

2. The antenna system sends a radio signal to the AVI transponder and receives a response. The antenna system may also write data back to the transponder, for example, the time and place of entry.

3. The receiver, which usually sits on the roadside in a box, collects data and transmits information back to the central computer.


AVI System Overview

Parts supplied The following parts are supplied with the 915 MHz AVI system:

1. Antenna with RF electronics and a NEMA 4 enclosure

Antenna ANT915-00xx

Transceiver RDR915-000x

2. Junction board

JCT100-000x

3. Reader controller card (RCC)

RCC 100-000x

4. RCC software on a 3.5-inch disk

SCP100-000x

5. AVI System Installation Guide

MNL915-0001

Note: x is a client-specific.

Optional parts for installation

The following parts are optional for installation but highly recommended:

• Calibrated beeper transponder (P/N T915Z-0001) in continuous mode for test purposes.

• Breakout box (P/N BOB915-0001) for testing power to the antenna assembly.

4 AVI System Installation Guide November 1995

AVI System Overview

AVM System Connections

L'gerk-

POWER Supply

DC +15V 3A -15V 0.5A

XMIT U3

RECV UI

1sA-type card-

PC lane controller (and power source)

standard AT bus

OR

W +5V 3A

RS lane

controller next RCC

LED

Previous RCC

Figure 3. AVI system part,,

Parts supplied are the antenna assemb ly (antenna, transceiver, NEMA enclosure),

November 1995

AVI System Installation Guide

board, and the RCC. 0

I ■

5

AVI System Overview

Parts required but not supplied To install the AVI system, you will need cabling, a power supply, bracket(s) on which to mount the antenna assembly, tools, and terminal emulation software (if the monitor PC is used).

Cabling

The types of cabling needed include

• an RS232 cable. Connects the junction board to your monitor PC so that new software can be loaded on your computer and you can view transactions, especially when establishing the antenna read footprint.

• a SCSI-2 type cable. Connects the junction board and the RCC.

• a fiber optics cable. Connects the antenna assembly to the junction board.

• sync cables. Connect junction board to adjacent junction board. Multiple-lane synchronized configurations require custom-length synchronization cables.

Note: Lane discrimination, which is optional and site-dependent, requires synchronization. However, synchronization may be required even if lane discrimination is not. This is the case when lanes have less than an 8-foot separation.

• a power cable. Connects the RF transceiver to the DC power supply.

Specifications for each cable type follow:


AVI System Overview

RS232 cable. Standard female-to-female, 9-pin cable that connects your monitor PC to the junction board at J5.

SCSI-2 type cable. A 68-pin cable connects the reader controller card and the junction board at 11.

Example: AMP cable type 750732 -n (n designates the cable length.) Several lengths are available. Because the cable is not used in a SCSI-type capacity, termination is not a consideration.

The pin assignments are listed in Table 8 on page 30.

Fiber optics cable. Connects the antenna assembly (RF transceiver) to the junction board at U1 and U3. Connections must be standard ST-type, as in the following illustration of the HFBR-X41XT connectors.

Example: AMP fiber optic cable assembly

• AMP P/N 094-7024-49-n (n designates the cable length; several are available)

• ST-style multimode connectors

• 100/140um premise networking outside

• plant (4-fiber) cable

The minimum length of the cable is 10 feet. The maximum length of the cable is dependent on the jumper settings in both the transceiver and junction board. With the default settings, the maximum is 1000 feet. If these settings are changed, the maximum length can be up to 5280 feet (1 mile) in length.

See Table 7 on page 27 for jumper setting values.

November 1995 AVI System Installation Guide

9

IJL

>7, RMI

AVI System Overview

II

x^.au/rs.x^t

KM

'us ew u+xu

pasZu*I MN

S I LEI., M w PM4

PUN I

Figure 4. Fiber optic cable connectors

Standard ST-type HFBR-X41XT connectors U

AVI System Installation Guide November 1995

AVI Sysatrn O MEViii w

Power cable. Connects the RF transceiver to the DC power supply.

A Deutsch BVD06EO611SN connector with a minimum of 16-gauge, multi-strand, outdoor-type wiring with a maximum length of 100 feet is recommended.

Pin assignments are found in Tables 5 and 6 on pages 22 and 23.

Sync cables. Multiple-lane synchronized configurations require custom-length synchronization cables to connect junction board to junction board. The length of the cables are site-specific.

Lane I Lane 2 Lane n... Antenna Antenna Antenna

Junction u Junction Junction Board I t Board 2 + Board n...

RCC I I I RCC 2 I I RCC n...

Figure 5. Multilane system configuration

Junction boards are connected in muI ile tare configurations. 0

Use 4-twisted, shielded wire pairs, 22-gauge minimum, one DB15 male and one DB15 female. You need two cables per junction board, one for input and one for output.

Example: Wire type 2ASWTE1934AJTM multi-strand.

For pin assignments, see Table 10 on page 32.


AVI System Overview

DC power supply for the transceiver

Cable requirements. When all cable gauge requirements are met, the maximum distance allowed from the transceiver is 100 feet.

Power supply unit requirements. For DC output, requirements are +15v/3A, -15V/.05A. In general, the supply wire gauge must permit no more than a 3 -volt loss over 100 feet at 3A (0.5 ohm resistance total).

Examples: Power One model HDD15-5-A (linear, non-switching)

Power One model MAP80-4003 (switching)

The power supply is typically mounted in the roadside box along with the receiver. It can also be mounted with the NEMA enclosure as long as the watertight seal integrity is not violated.

The power supply requirements for direct connection to the transceiver while within the NEMA enclosure is +15V,3A / -15V,0.5A, with sense wiring on the PSU disabled.

Bracket(s) for mounting the antenna

The antenna is mounted on a bracket or a gantry using the two U-bolts. Pipe thickness must not exceed 2 3 /8

inches since the internal distance between the U-bolt ends is 2 1 /2 inches. The U-bolt is secured using a 1 1 /2 -inch

bolt and two washers.

Note: More than one bracket may be required to change the antenna elevation level or to prevent the antenna from rotating on the gantry pipe in areas with high winds.


I

AVI Systen>t Owarvisw

Tools for installing

— Common hand tools

— Multimeter

— PC-compatible notebook computer or equivalent

— Calibrated field strength meter for 902-928 MHz ISM band

— a breakout box

— a test transponder

Terminal emulation software for monitoring

To use the monitor PC software for alignment and maintenance that comes with the RCC, equip your PC with any ANSI-compatible terminal emulation program, whether windows-based or command-line driven.

Examples: Microsoft Windows 3.1 Terminal, Telix, or ProComm.


AVI System Overview

Parts Summary

M

The following table summarizes parts supplied for installation:

I Parts Supplied

Part Part Number

30° Antenna w/Transceiver AWT915-0100

Can be ordered separately:

302Antenna ANT915-0020

Transceiver RDR915-0004

Transceiver w/Help RDR915-0504

Junction board JCT100-0002

Reader controller card w/software RCC100-0006

AVI System Installation Guide MNL915-0001

test transponder tag T915Z-0001

breakout box BOB915-0001

Table 2. Parts supplied I

12

AVI System Installation Guide

November 1995

Table 3. Other parts required but not supplied R

Other Parts Not Supplied

Part / Type Examples Dimensions

Gant ry P ipe P' e - -_ - -- . -

- - 2thick 31&

Power supply unit linear, non-swihhkng

+15V,3A/-15V,0.5A

Power One 1DD15-5-A 14x4.87x3.53

switching Power One MAP80-4003 7.2x4.2x1.8 7'

Software for monitor PC Wndos 3.1, ProComm,Telix n/a

PC-compatible computer Compo% Del, 11 Notebook n/a

Field strength meter 902-928 MHz ISM band Holladay Industries H14000 n/a

Muitlmeter and hand tools

f G^.

AVI System Overview

The following table lists other parts not supplied but required for installation.

The following table lists the types of cabling you must supply for installation.

Cabling Required lit Nut S^plied

Type Purpose FAN WE" Connectors Length [min/max]

RS232 Junction board to may enaion female-female — /12 feet monitor PC vendors cable 9-pin

SCSI-2 Junction board to AMP 750732 68-jr 68-pin — /6 feet RCC

Fiber optics, Junction board to AMP 094-7024- 4-fiber std ST-type 10 ft/1 000 ft* 4-fiber antennaasse{nby 49 mknode

Sync (for multiple Junction bard to n/a, custom-made 4-twisted, D815 male site-specific lane synchron- junction board shialded, 22-genge

DB15 female izations), 2 per junction bd

DC power Transceiver to Deutsch 16-gauge, atom /100 ft power supply BVD06EO611 SN multistrand,

outdoor type

thliecorrectfQniPersetthgs on junction board and transceiver, the maximum length can be 5280 feet (1 mile).

Table 4. Cabling required but not supplied 0


AVI 9rat.in Overview


Ins 1knian

2 Installation

Installation instructions for the AVI system follow this order:

1. Install the antenna assembly.

2. Connect the junction board.

3. Connect the reader controller card.

4. Switch on the power.

5. Shut down the system.

Before beginning the installation process, be sure you have available all parts required—both those supplied and those that you must supply (see pages 4-12).

Alignment of the antenna is a separate process explained in Appendices A and B.


Installation

1. Install the antenna assembly

The antenna assembly is usually shipped with the antenna, the RF transceiver in a NEMA 4 enclosure, and the mounting brackets assembled. The assembly also includes parts not supplied—the power supply and the overhead gantry.

Note: Since the power supply for the antenna is not supplied, see page 9 for specifications.

To test power at the antenna, an optional breakout box (P/N BOB915-0001) is available. You can also order an optional calibrated test transponder tag to test the antenna read footprint (P/N BOB915-0001).

Figure 6. Antenna frontroadside view

The antenna the front faces oncoming traffic. Dimensions: 36 3is x 42 3/s x 10 7/1s

LJ


Installation

1 3/16"_. 40"

1 1/2' 17 112"

10 7/16"

•• ••

1 5/16"

4 holes 1/8" thick

13/32" diameter PVC Radome

thru each support channel for sway bracing

Figure 7. Antenna assembly (back) V The front faces traffic and the RF transceiver faces skyward. U

Figure 8. Antenna assembly (profile) 0


Installation

fiber optic connections to junction board

Figure 9. RF transceiver

The transceiver is connected to the anten na and the junction board. Dimensions: 20 x 10 x 2 1/4'


Installation

1. Place a label on the RF transceiver that shows the frequency setting. Verify the dip switch setting. (See Table 15 on page 44.) You will need this information should you ever replace the transceiver.

2. Mount the antenna assembly to an overhead gantry using the U-bolts supplied with the antenna. The transceiver faces skyward. The front of the antenna faces oncoming traffic and the intended read area.

The distance between the internal ends of the U-bolts is 2 '/2 inches. The gantry pipe must then be a maximum of 2 3 I8 inches in diameter.

NEMA 4 alum pnclosure 24"f/X 16" Wx 5" t

2"

42 3/8'

21 3/16'

I — 11 5/8" ly 2 U-bolts for 2" IPS pipe

36 3/8" 2 3/8" O.D.

Figure 10. U-bolt placement—aerial view

Mechanical drawing of U-bok canecfions. U


Installation

1 3/16_. 4V"

11/2 171!2"•

4 holes 13/32" diameter

thru each support channel for sway bracing

1/8" thick PVC Radome

10 7/16" "r

55/16"

15/16'

Figure 11. Attaching U-bolts--side view Mechanical drawing for U-boft connections . u

Caution: Because of its size and weight, more than one person is required to install the antenna assembly. Use extreme care and safety procedures for heavy items when installing the antenna. Always wear a hard hat.

The 90-pound antenna assembly is mounted 18 feet above the road (z-axis), centered above the lane (x-axis), and horizontally level (y-axis). The antenna front should face oncoming traffic. The transceiver s'-

slould-be he_top of the antenna installation and face skyward.

antenna

z axis

y- cIs

x- s

lane

Figure 12

Axes defined 0


Installation

3. Set the angle of the antenna to five degrees (from the a-axis) with the antenna angled toward oncoming traffic.

4. Add brackets as required to keep the antenna from rotating, especially in areas designated as having high winds.

5. Connect the Rx and Tx cables inside the NEMA 4 enclosure of the antenna to the transceiver RX and Tx connectors. The transceiver Rx connects to the cable labeled "Top". The transceiver Tx connects to the cable marked "Bottom".

6. Connect the fiber optics cables to the transceiver inside the antenna enclosure.

The fiber optic cables are connected to the junction board receive-to-transmit and transmit-to-receive. U1 RECV connects to OPTO Tx and U3 XMIT1 connects to OPTO Rx.

Note: These are the only cable connections to the junction board from the antenna electronics.

Connections to the junction board are described in the section, 2. Connect the junction board, on page 25.

...............................

...............................

...............................

............................... ...... ANTENNA ......... . . ...............................

...............................

...............................

...............................

...............................

............................... NEMA 4

JUNCTION I : \ J2breakout box

BOARD

OPTO RX

OPTO X • RX

• TX

to DC power supply

power connector

RF TRANSCEIVER

Figure 13. Fiber optics cabling connection Fiber optics cabling connects the junction board to the RF transceiver. Also shown is the breakout box to test voltage. U


+16VDC, 3A max

Transceiver Deutsch connector

E +16V F

G H

A transceiver B

gm" C D

-96V L NC K

O.5A max

Installation

7. Connect the DC power cable to the RF transceiver inside the antenna enclosure. Be sure the power supply is off.

Caution: Hot swapping is not allowed! It may damage the transceiver.

You have two options for wiring—one with full sensing and the other with no sensing.

Full sensing option. The following are the wiring assignments for a DC power cable having full sensing.

A +15 return E +15 sense * J spare B +15 return F +15 VDC,3A max K NC C +15 return sense G +15 VDC,3A max L -15 VDC,.05A max D -15 return H +15 VDC,3A max

* If power supply allows remote sense lines. NC=not connected.

Table 5. Cable to the antenna power with sensing

Wiring assignments for the cable to the antenna power supply unit

0

Note: As can be seen in Table 5 and in the following schematic, there is no -15V return sense. This is recommended because the load is relatively small.

Also, be sure the return and return sense wires are not tied together at the PSU side when using this option.

Figure 14 shows wiring for full sensing.

Figure 14. Option 1: FuA sensing wiring Full sensing implemented on +15V,3A power supply unit.


Installation

No sensing option. The following are the wiring assignments for the power cable having no sensing. While the load is relatively constant, the no sensing option does require that volatage drops be compensated for manually.

lg& Pin Signal Pin SIgnal A +15 return E +15V J spare

B +15 return F +15V K NC

C +15 return G +15 V L -15 VDC,.05A max

D 1 -15 return H NC

NC = not connected

Table 6. Cable to the wWm powulh no sensing

Wiring assignments for the cablebfie al - power supply unit U

Transceiver Deutsch connector

E +15V F

15VDç3A max

H -return

A transceiver B

ground C D

-15V L max

NC

Figure 15.

No sensing implemerged. Vows dmp compensated for by manually increasing PSU voltage.

Note: If the PSU has four wires, jumpers must be installed when using the no sensing option.


8. Check that the voltage is correct at the antenna.

The optional breakout box helps you check the voltage at the transceiver side. Keep cabling to the box short—about six inches long between connectors.

Use the breakout box to measure the suppy voltages under normal load conditions at the transceiver side. For example, if the measusred voltages are +13V, but the PSU is giving off 15V, the PSU voltage must be increased to 17V to compensate for the loss at the transceiver side.

female Deutsch +15v grid -15v

Ile utsch nnector

power supply

Figure 16. The breakout box Breakout box supplied with the optional installation kit

Caution: Whether using sensing or no sensing, thersupply voltage at the transceiver side must be 15V ±.05V to be sure the system functions properly.

9. Set the RF footprint. Instructions are found in Appendix A.

0


Installation

2. Connect the junction board

The junction board provides access to the connectors that interface with the RCC and the remaining AVI system.

Figure 17. Junction board The J1 c,pnnec ion to the RCC and the two fiber optics connections to the antenna are required. Other connections are kPPhiti0n depen^fent ✓


Installation

Mount the junction board as close to the RCC as possible. For your convenience, six holes are available on the board.

4.0'

3.8"

.2"

0.0" .2" 2.75" 5.3"

5.5"

Figure 18. Junction board dimensions 0


Installation

Junction board connections

The junction board has eight connectors—two fiber optic and six electrical:

• Two connect to the transceiver in the antenna assembly These are the fiber optic cable connections U1 RECV and U3 XMIT.

One SCSI connects to the RCC. This is the J1 connector.

The remaining five connectors support various options, such as an LED display.

Fiber option connectors. U1 RECV and U3 XMIT connect the fiber optics cables to the antenna assembly. (See Figure 13 on page 21.) The fiber optic drivers are the only active components on the junction board.

Connectors must be standard ST-type. Minimally, a pair of strands must be used, one for transmitting data, and the other for receiving data. The minimum length is 10 feet. With the default jumper settings in the junction board and the transceiver, the maximum length is 1000 feet. Up to one mile of fiber optic cabling can be used if the jumper settings are changed from the default.

Poslflon — < 1000

(default)

1 1000-2500 2 2500-5280

Table 7. Jumper settings for different cable lengths Jumper settings are the same it the transceiver and the junction board.

Note: The RCC and transceiver have a provision for adding a third fiber if future receiver/transmitting expansion is required.

The recommended cable part number is FBRO160450OF (available from Computer Cable Connection). This is 500 feet of 4-strand cable terminated with standard ST-type connectors. Minimally, a two-strand cable must be used.

l


installation

The fiber optic connectors used at both ends of the fiber optic cables are available from Hewlett-Packard. The part numbers are

• Transmitter: HFBR-1412T

• Receiver: HFBR-2412T

Junction board connectors. The six connectors are labeled J1 through J6.

J1 connects the junction board to the RCC. This SCSI connection is required; the remaining connections are optional. This is a 68-pin SCSI-3 type cable.

J2 (optional) is connected to a lane controller when RS422 communications is required between a lane controller and the RCC board. This is an RS422 with a female DB9.

J3 (optional) provides output to the next junction board. This is a DB15 male connector.

J4 (optional) provides input from the previous junction board. This is a DB 15 female connector.

Note: J3 and j4 are used in multiple lane configurations.

J5 (optional) connects a monitor PC with a serial port. The computer is used to monitor the reader controller activity. Also, it is used to make changes to the AVI system parameters and run diagnostics on the system. This is a standard RS232 DB9 male connector.

J6 (optional) is used to drive the LEDs that show system status. This is a DB25 female connector.


Installation

Figure 19. Junction bd wi onS

Ji to RCC. J2 to a RS422. J3 ovaput to next RCC. J4 input from previous RCC. J5 to PC monitor. J6 to LED. 0


Installation

11—Reader Controller Card

To connect the junction board to the RCC, the recommended cable is AMP 750732. This 68-pin SCSI cable comes in several lengths.

The following chart provides the pin number and corresponding signal name for the RCC connector.

________ Pin Sfnal Pin SiqnaI 1 MPTxD 24 LED4 47 RF1 Out-

2 MPRTS 25 LED6 48 RF20ut-

3 MPCTS 26 +5V 49 GND 4 ALCTxD+ 27 +5V 50 GND

5 ALCTxC+ 28 +5V 51 LoopDectO-

6 ALCRxD+ 29 SyncTxD+ 52 Loop Decti-

7 ALCRxC+ 30 SyncTxC+ 53 LoopDect2- 8 +5V 31 SyncRxD+ 54 LoopDect3-

9 Sync in+ 32 SyncRxC+ 55 GND

10 Sync out+ 33 GND 56 LED1

11 RF1In+ 34 GND 57 LED3

12 RF2In+ 35 MPRxD 58 LED5

13 RFlOut+ 36 MPDCD 59 LED7

14 RF20ut+ 37 GND 60 GND

15 Xrnitl Out 38 ALCTxD— 61 GND 16 Xmit20ut 39 ALCTxC— 62 GND

17 LoopDectO+ 40 ALCRxD— 63 SyncTxD-

18 LoopDectl+ 41 ALCRxC— 64 SyncTxc- 19 LoopDect2+ 42 GND 65 SyncRxD-

20 LoopDect3+ 43 SYNC In— 66 SyncRxC-

21 RF1n 44 SYNC Out— 67 GND

22 LEDO 45 RF1In— 68 GND

23 LED2 46 RF2In— I Table 8. 68-pin SCSI pin assignments

Wring assignments for junction board to RCC cable. U


Installation

J2 RS422 lane controller (optional)

The RS422 is an optional connection that replaces the parallel 110 connections. Specifics for the RS422 are as folio

• Data is output on the TxD line and input from the RxD line.

• Baud rate is 19200.

• Parity is even.

• Connector is a DB9 female.

• Use twisted, shielded wire pairs, for example, Delta Surprentand Wire P/N 508-365-6331.

1 ALCTxD+

2* ALCTxC+

3 ALCRxD+

4* ALCRxC+ 5* GROUND

6 ALCTxD- 7* ALCTxC- 8 ALCRxD-

9* ALCRxC- * optional

Table 9. RS422 pin nsigtments

Wiring assignments for RCC to lane controller cable optional cable. 0


Installation

J3 and J4—next and previous RCC (optional)

If poll synchronization, with or without discrimination, is to be enabled, custom-length cables are required to link the junction boards. Two cables—one to the previous RCC and one to the next RCC—with four twisted, shielded wire pairs (22 minimum gauge) must be used. Cable is wired one-to-one.

Connectors on the junction board for J3 and J4 are as follows:

J3 a DB15 male connector provides output to the next RCC.

J4 a DB15 female connector provides input from the previous RCC.

The following table provides the pin number and the corresponding signal name for the connection between the junction board and the next/previous RCC.

Pin Signal 1 Sync+

2 unused

3 RF1+

4 unused 5 RF2+

6 mused

7 RS422 data+ 8 mused 9 Sync-

10 unused 11 RF1-

12 unused

13 RF2-

14 mused 15 RS422-data-

Table 10. Junction board to junction board cable pin assignments

D815 pin assigrr^enLs for the optional, custom-made cable. These cables are used to enable lane discrimination. 0


Installation

15—monitor port

The monitor is used when setting up the read area. And, during operation, informational messages will be displayed on your PC monitor. See Appendix E for a list of commands.

A standard RS232 9-pin female-to-female cable connects the monitor to J5. The DB9 male connector has the following pin assignments:

..............................................

1 MPDCD

2 MPTxD

3 MPRxD 4 mused

5 Ground

6 MPCTS

7 MPRTS

8 unused

9 unused

Table 11. wring herds for RCC to-monitor cable

DB9 pin assignments. Thiij, 0


Installation

J6—LED status display

The J6 connector—a DB25 female—is used to hook up with an optional LED status display. LED outputs can supply a maximum of 20 mA for LED drive.

Description L.ED Pm Growid Pm Flashing LED: CPU alive 2 3

Lane Controller I/O: OK 5 6

Vehicle w/transponder has been read 8 9

10K buffer 80% full 11 12

RCC Master 16 14

Lane Controller using parallel I/O 19 17

Alternate transponder has been read 22 20

Last BIT test run passed 25 23

Table 12. LED status display pin assignments

Wiring assignments for LED status display. The LED display is optional. 0

1 34 AVI System Installation Guide November 1995

Installation

3. Connect the RCC

The RCC, which provides high-speed bus commun-ications, is dependent on the PC for power. However, using the RS422 (J2) connector on the junction board instead of the parallel I/O, the RCC can be installed in a separate enclosure with its own power supply. When the reader controller card is installed in a PC ISA-type slot, the PC can also be used as the lane controller.

Figure 20. ReaderconbA rcard 0

The abort button is used to download software and the reset button resets the RCC.

The RCC is configured to use PCIRQ1 1 and address space DE00:0000 through DEOO:IFFF. Jumpers are available to change both the IRQ and memory address.

Caution: Except for J10, J11, J19, do not remove or change any jumper setting. However, these three jumpers must be changed if an alternate power source is used.

If the parallel I/O option is used, jumper J7 sets the PC memory address and J3 sets the IRQ number (you must use exactly one jumper).


Installation

RCC power supply connections (optional)

The two ways of powering the RCC are:

• Through the PC connection to the bus

• With a direct power connection on the RCC.

Note: As shipped, the RCC is configured to receive power through the ISA bus. In this default setting, jumpers 110, J11, J19 must be present.

If power is only available from an external source, jumpers 110, 111, and 119 must be removed.

Th eve-method usesa standard PC disk drive power connector that is available from most computer supply stores. Wire size and length are not critical as long as the voltage at the RCC is 5.0 volts, while 3.0 amps is being drawn from the power supply. Use the following wiring assignments.

Table 13. RCC power supply pin assignments Wiring assignments for 4-pin power connector. This is optional. The RCC can draw power from an ISA bus.


Installation

4. Switch on the power

To check that the AVI System is set up with the correct voltage at the antenna and the RCC, you will need your monitor PC running.

1. Connect your monitor PC to the monitor port connection on the junction board (J5).

Figure 21. Arch n board *o port connection 0

2. Start an ANSI-compatible terminal emulator, such as Microsoft Windows 3.1 Terminal, on your PC.

Elie Edit $ettln s Ehone Iransfers Help s

: v:i .;;:K;:ti,'•+•.v,+.{:•: ;;.•:+>.•:S:>' .. ♦ .%:•}:.^^i:.:•:.; •. .i^lf,:;:}:+.}fF/.:Y• } }}}j}}Y:^ :Y:^^:iii•}A}a.}: }'r•';},;:;:.Y. •. ... .......Sv$:i: i::{;:::^v::v::v. ::y.: v. .... is .. .....

Figure 22. Microsoft Windows terminal window

Any AN$kompatible termir>a! nidatorca, be used. n


Installation

3. After all connections are made, turn the circuit breaker or power switch on to power the antenna assembly.

Caution: When the antenna is powered on, DO NOT go closer than 1 meter.

For health and safety reasons, OSHA has determined that it is hazardous to be within a 1-meter range of the antenna front when the antenna is powered on. For individual health and safety, no one should enter the region shown in the illustration when the antenna is turned on.

s

danger zone

Figure 23. OSHA-defined antenna danger zone When the antenna is powered on, no personnel should be within a radius of 1 meter of the antenna front. U

4. Wait about five seconds before switching on the RCC. p

5. Power up the RCC. Wait another five seconds.

6. Using the breakout box, check for the correct voltage at the antenna. Voltage should be ±15V. Otherwise, measure the voltage at the power supply, but 1 compensate for voltage loss over DC feeder cables. See Appendix A.

6. Check that the RCC voltage is +5V with ± 0.2V I tolerance. See page 9 for information on DC feeder cable requirements.


Installation

................................

................................

................................

................................

............ANTENNA .......... .

................................

................................

................................

................................

................................ ................................ NEMA 4

JUNCTION r box BOARD

OPTO • •TX

Po to DC power supply

wer connector RF TRANSCEIVER

Figure 24. Check voltage at anleii Use the 4eakout box in1t i-. ,n-ldt to check the voltage at the antenna. U

6. If you are using a PC connected to J5 on the RCC, verify that the following messages are displayed on the monitor, including the following:

version [number]

DUART: OK

Beginning System Initialization

Note: The version number is customer-dependent.

7. Using instructions in Appendices A and B, ensure the RF footprint meets your system requirements.

a. Place the test transponder between thumb and forefinger. Be sure its antenna faces up and the velcro side faces the antenna (as it would if it were attached to a windshield).

b. Walk with the transponder at least three feet above the ground to simulate the height it would be in the average vehicle.

c. Use the monitor PC to check the continuous read.


Installation

hold edges at center of tag between thumb and forefinger with palm up

Figure 25. Test beeper transponder Hold transponder edges with downlink antenna at top. The side with the velcro attachments must face the antenna.

8. Optional: Connect your PC with an RS422 converter U to J2 on the junction board and run a lane controller emulation program.

OR

Connect the reader controller to a lane controller (if not already connected). Check that your lane controller is receiving from the transponders correctly.


Installation

Junction Board

Connector see wiring diagram for RS422

RS IRSI 2 3 2 I standard

25-pin to 9-pin computer cable

PC

lane emulation software

standard keyboard cable adapter supplies power to computer

Figure 26. PC to RS422 b J2 oorlten"'m LI

5. Shut down the system

Ibe system shutdown sequence is as follows:

1. Turn off power to the antenna.

2. Turn off power to the RCC.


Installation

42 AVI System Installation Guide November 1995 0

Maintenance

3 Maintenance

Maintenance of the AVI system is generally limited to typical leaning, inspection, and repair procedures normally associated with electronic equipment.

The vehicle transponder is a sealed unit that is initialized atuthorized service center and, once installed, requires no maintenance.

The reader computer hardware is limited to replacement of defective circuit cards, LEDs, power supplies, cable, and connectors. Updates to the RCC software will be accompanied by instructions.

The antenna assembly maintenance is limited to regular inspection and replacement of defective cables, connectors, and electrical components.

Depending on your preventive maintenance schedule, check at least every 12 months inside the antenna NEMA box for abnormalities, such as corrosion. Likewise, if the

RCC and junction board are installed in an outside

endosure, check them at least every 12 months for possible corrosive conditions.

3,recommends that the radome be cleaned monthly to

remove soot deposits from traffic exhaust, especially when th Of _diesel-propelled vehicles.

heck +15 volts and -15 volt levels, and adjust power

supp y, n

43 November1995 AVI System Installation Guide

Maintenance

You can use the optional LED status display in servicing

and troubleshooting.

Flashing LED: CPU alive 2 3

Lane Controller I/O: OK 5 6

Vehicle w/transponder has been mad 8 9

10K buffer 80% full 11 12

RCC Master 16 14

Lane Controller using parallel I/O 19 17

Alternate transponder has been read 22 20

Last BIT test run passed 25 23

Table 14. LED status display pin assignments

Wiring assignments for LED status display. The LED display is optional. 0


Maintenance

Servicing The following items are considered field replaceable units:

• antenna assembly

• transceiver

• power supply

• junction board

• reader controller card

• RCC software

When replacing the transceiver, be sure that the new transceiver has the same frequency setting that the old one has. To do this,

1. Check the label you placed on the RF transceiver indicating the frequency setting. (See page 17.)

2. Remove the transceiver enclosure casing.

3. Check the dip switches with Table 15, RF transceiver dip switch settings on the following page.

Figure 27. Locating the dip switches in the RFtransceiw A

November1995 AVI System Installation Guide 45

Maintenance

\ H'

thp SWilCb XX

U U U D

D U

D D

U U

U D

[

D U D D

U U

U D

D U

D D

U U

916 U D D DD

917 U D D

ii 919 D U U U D

920 D U U D U

921 D U U D D

922 D U D U U

923 0 U D U D

924 •D U D D U

926 D D U U U

927 D D U U D

928 D D U D U

FU=up D=down

Note: Highlighted frequences are preferred settings for FCC compliance.

Table 15. BE transceiver dip switch settings

Dip wift SOW tor each 902-928 MHz I


A: Antenna Alignment-Single Lane

Appendix A Antenna Alignment Single Lane

Some AVI applications specify a single lane for vehicle identification. In this case, the antenna will be functioning alone without possible interference—or " bleed" from other antennas.

If you are setting up a single-lane application, follow the instructions in this appendix. When one or more adjacent lanes have antennas mounted over them, use the instructions for setting up multiple-lane configurations found in Appendix B.

Poll sequencing instructions for both multiple- and single-lane setups are found in Appendix C—Setting the Poling Sequence.

To align the antenna in a single-lane application, you must

First, determine the RF footprint—the area in which the antenna will read the transponder tags.

'Then, you can align the signal laterally. You must balance the field strength so that it is centered within the lane.

Caution: Aligning the antenna is extremely important to the proper functioning of the AVI system so that all signals are read correctly.

November 1995 AVI System Installation Guide A-1


I)etermining the RF read area You have already set the forward angle of the antenna (the tilt toward oncoming traffic from the x-axis) is to 5 degrees. For a 5-degree angle with an opening angle of 30 degrees, the rule of thumb for setting the height (z-axis) is that 18 feet equals a 12-foot lane coverage (width or y-axis). Note that this is a linear correlation.

Use the following diagram for reference in defining the setup.

antenna

z axis

lane boresight

Figure A-1. Axes defined

A-2 AVI System Installation Guide November 1995

A: Antenna Alignment—Single Lane

To determine the boresight, which is the area of maximum field strength, use the following information:

50

z-axis

1ff Mounting height D1 x 0.087= Distance 02

D2/D1 = 0.087 D1

In this example,

x-axis 18 ft= mounting height 5°= tilt angle of antenna to roadway boresight 1.57 feet from the y-axis on the x-axis

2

y-axis 1. 7 ft

15ft

sft±l 9ft±1

Figure A-2. Fing the boresight

1. Measure the height of the gantry at the point the antenna is attached.

2. Be sure the antenna is mounted at a five-degree angle from the x-axis.

3. Determine the D2 distance by multiplying the height times 0.087.



4. Next, determine the RF footprint of the antenna as it is currently positioned.

With the antenna mounted at the recommended 18 feet, the read area is 15 feet. The boresight is 6 feet (± 1 foot) from the forward edge of the read area and 9 feet (± 1 foot) from the back edge of the read area.

Your goal is to get a read area that is measuring at least 2 V/m at the boresight. You can get a larger footprint by increasing the output power to a maximum of 1 watt. At this level, the boresight measurement approaches 6 V/m.

Note: 1W, the legal limit, corresponds to tirisrf 150. Power output above this level violates FCC regulations.

5. Use the field strength meter with the procedure described in the next section, Aligning the signal laterally, to determine the field strength on either side of the lane.



Aligning the signal laterally To read the tags accurately, the signal must be balanced in the center of the lane. For example, if your field strength meter shows that the signal is 700 mV/m on the left side of the lane but only 300 mV/m on the right side, then the RF footprint is too far to the left and the antenna must be moved to the right on the x-axis.

Boresight = 2 V/m

Antenna

0 Determine field strength on right side of lane O Determine field strength on Iefht side of lane

Figure A-3. Rea hng the field strength using the continuous read test tag Be sure someone chngthe monitor screen to note the field strength being read.

On the one side of the lane. — in a straight line toward the antenna holding the transponder tag.

Repeat on the oth side ot the lane.

To align laterally,

1. Turn on the reader.

2. Hook up the monitor PC to the junction board (J5).

3. Use the monitor PC and version 3.1.1 of the RCC software to set the communication parameters, which are

19200 baud, 8 bits, 1 stop, even parity

After RCC power up, a message scrolls with the version number.


A- Antenna Alignment-Single Lane

4. To set the power setup, issue the command tirisrf (n], where n can be any value between 30 and 255. The recommended setting is 50, which corresponds to 100 mW. Open highway installations require a setting of around 70 (250 mW).

Issue the dupoff command.

(See Appendix E for a list of monitor personality commands.)

5. Set up the field strength meter.

Set the meter to "Peak Hold" to hold the maximum field strength. This setting prevents the meter's needle from fluctuating radically. Clear Peak Hold after every measurement.

6. By trial and error, use the continuous read test tag to check the read footprint. If the footprint is too wide, lower the setting. If it is too narrow, raise the setting. Determine the maximum.

Note: The strength must read at least 500 mV/rn in continuous wave (CW) at the desired footprint edges with RF on.

To activate CW, run the monitor rfon command). To turn rfon off, use the reset command.



7. Issue command rfon from the monitor PC. Verify at the lane border that the field strength is equal on both sides and at least 500 mV/m. If not, repeat the alignment procedures.

8. Issue the opmode command. For single lane alignments, the value is always 0030.

ti. U

Figure A-4. Sample alignment scenario See Table A-1. This scenario is for a toll plaza with 3 to 4-foot barrier between 12-foot wide lanes.



22! Antenna Type 302 An tenna Type

10 ft Lane width 12 ft

15 ft Antenna height above roadway 18 ft 2 ft min Ref height above roadway 3 ft min

10 ft wide x 15 ft long Read zone 14 ft wide x 15 ft long

15'± 2 ft= 500 mN min Boundary field strength 15' ± 2 ft= 500 mN min

52 Tilt angle (from horizontal) 52

Table A-1. Alignment parameter values

These are the values used for 22 2 and 302 antennas, assuming an 18 fo ot mounting height.

anten

2500 mV/m 2500 mV/m

beam center

lane edge

roadway

Figure A-5. Top-down view of alignment scenario 0


B: Antenna Alignment-Multiple Lanes

Appendix B Antenna Alignment Multiple Lanes

When AVI applications specify multiple lanes functioning side by side, antenna alignment is complicated by the possible bleeding of read areas. For a multiple-lane configuration, two adjacent lanes must never be at the same frequency.

The process for setting the polling sequence is explained in Appendix C—Setting the Polling Sequence.

November 1995 AVI System Installation Guide B-1

dLLAINAM-rent-Muttiple Lanes

i rminiiig lane discrimination

First, you must determine what kind of lane discrimination scheme will be incorporated, if any. Lane discrimination is not required if you are working with

• An open highway situation with at least 8 feet separation between lanes

OR

• A tollroad with at least 8-foot high barriers between lanes.

For a multiple-lane configuration with a 220 antenna, barriers must be at least 4 feet high.

With adequate barriers, use the instructions for single-lane alignment.

Otherwise, determine the lane discrimination configuration based on the number of adjacent AVI lanes. Options are 1, 2, or 3. If more than three, then repeat.

Option Use when...

1 1 lane or no discrimination 2 2lanes

3 - all other cases

B-2 AVI System Installation Guide November 1995

B: Antenna Alignment-Multiple Lanes

Aligning the signal laterally Follow the instructions in Appendix A to set up for each lane individually.

Note: As you are setting up the antennas separately, be sure power is on only for the antenna being aligned.

Once you have each lane set up, then follow these instructions:

1. For the boundary between lanes 1 and 2, manipulate the power balance for READER transceiver 1 and READER transceiver 2 until the field strengths at the lane boundaries are equal. (Accuracy should be within five percent of field strength).

• If a three-lane configuration is used, maintain a constant power for the center lane and adjust the powers for the adjacent lanes separately to obtain the proper field strengths.

If more than three lanes are being configured, begin with the center-most lane. Use this lane as the reference and work outwards to the outer lanes. This chronology results in the least variation of the fields across a multi-lane environment.

2. Using the field strength meter, visually verify that the field strength at beam center is in excess of 2 V/m in CW. Then, measure the field strength at the lane boundaries. Field strength accuracy should be within 5 % from lane to lane.

To be sure that your antenna finds the best read and is not pointing at a null-read pocket, it is important that you systematically vary the position of the field strength meter, to ensure meter averaging.

3. Once the field strengths at the lane boundaries are equal and at least 500 mV/m, the proper pattern has been achieved.

November 1995 AVI System Installation Guide B-3

A meat-Multiple Lanes

B-4 AVI System Installation Guide November 1995 '

C: Polling Sequence

Appendix C Polling Sequence

Whether your application is a single-lane or a multiple-lane configuration, setting the appropriate polling sequence will ensure that all tags are read and that none are missed. A good polling sequence is especially critical in open highway scenarios.

The antenna sends out signals to "read" the transponder tags that pass through the read footprint. The frequency and sequence of the signal is important in establishing that all tags are read accurately and no tag to be read is missed by the RCC.

In addition, the reader can be told what kind of tag for which to poll. Tags from other tolling jurisdictions can be eliminated easily from the read by not specifying that type in the polling setup. Only recognized tags will be read.

The frequency is the number of times a type of tag must be seen before it is considered a valid tag. This number is the threshold number.

To set up the polling sequence, the monitor PC should be ready for you to enter commands. Because commands are entered in real-time, they can be entered in any sequence. Each RCC must be set up separately.

Determine the name of each RCC and the number of the lane it is to be associated with. For example,

RCC name Lane number

RCC1 01

RCC2 02

RCC3 03

November 1995 AVI System Installation Guide G 1

C: Polling Sequence

Two basic scenarios are provided. The first is for an open highway, high-speed situation. The other is for a toll plaza.

C-2 AVI System Installation Guide November 1995

C: Polling Sequence

Scenario 1—Open Highway With the open highway scenario, three antennas are set up in adjacent lanes—one antenna for each lane. Note in this scenario the polling sequence is set up to read only TIRIS transponder tags with lane discrimination.

The commands used are lanenum, numlanes, opmode, polls, and a threshold command. In the open highway example, the threshold command is tiristh.

Command

Antenna/RCC #

1 2 3

lanenum 01 02 03 numlanes 03 03 03 opmode 0030 0030 0030

polls 110f 110f 110f tiristh 01 01 01

Table C-1. Open highway polling sequence example

This scenario has 3 adjacent lanes reading TIRIS tags. 0

Details of each command for Table C-1 are as follows:

1. For each lane, issue the lanenum command, supplying a 2-hex value (00-255) to identify the number of the lane, and therefore the number of the RCC. Lane numbers must be in sequence.

2. For each lane, issue the numlanes command, supplying a 2-hex value (00-255) to indicate the total number of lanes involved in the scenario.

3. For each lane, issue the opmode command to indicate the type of operating mode that will apply to this antenna. Always set opmode to 0030, unless otherwise directed.

4. For each lane, issue the polls command to tell the reader the polling frequency and type of tag for which to poll.

November 1995 AVI System Installation Guide C-3

C: Polling Sequence

The value can be 2-10 hex, with the first digit indicating how many consecutive times a poll type appears in a sequence. In this example, the poll type appears only once in the sequence.

The second digit tells the reader what kind of tag it is. In Table C-1, each sequence will read once if it is a TIRIS (lane discrimination) tag.

Each pair represents a sequence.

Note that "OF" is used to signal the end of each sequence. A series of up to 5 pairs of digit pairs can be part of one sequence. In this scheme, "110?' sets up lane discrimination.

5. Issue the tiristh command to set the read threshold—that is, the number of times a TIRIS type tag must be seen before it is considered a valid tag. The value is a 3-hex number (00-255). With the threshold set to 1, the first read that occurs is passed on to the lane controller.

If the threshold value is set higher than 1, say to 5, then five reads must happen before being passed onto the lane controller. If less than five reads occur, than nothing will be sent. The reason for setting a high threshold is to avoid possible ricochet reads.

It is recommended that the threshold be set to 1. (Essentially, this means the threshold is not on.) Because high speeds are characteristic of an open highway situation, the TDMx index is 1 to 3. Polling in a high-speed sequential scenario means there are not many chances to get a read. If the threshold is set to 2, that means that one read is thrown away. It is inadvisable to use such a filter in an open highway situation with adjacent lanes being read. However, in a toll plaza more filtering is advised.


C: Polling Sequence

Scenario 2—Toll Plaza This toll plaza scenario has four antennas set up in adjacent lanes—one antenna for each lane. Note this scenario has several poll sequencing (polls) alternatives, which are:

• For California Title 21 compliance, one alternative is to read CALTRANS transponder tags as well as TIRIS tags.

Another alternative is to read both TIRIS tags and TCA tags.

• The third alternative is to read CALTRANS, TCA, and Help tags.)

The commands used are lanenum, numlanes, opmode, polls, and a threshold command.

Command

Antenna/RCC #

1 2 3 4

lanenum 01 02 03 04

numlanes 04 04 04 04 opmode 0030 0030 0030 0030

polls

CALTRANS 100f 100f 100f 100f TIRIS + TCA 1040f 1040f 1040f 1040f CALTRANS, TCA, Help *

101520f 101520f 101520f 101520f

tiristh

Table C-2. Toll plan polling sequence example

This scenario has 3 adjacent lanes reading TIRIS tags.

Details of each command for Table C-1 are as follows:

1. For each lane, issue the lanenum command, supplying a 2-hex value (00-255) to identify the

* The transceiver must be equipped with Help, for example, PIN RDR015-0504.


Pao uq Sequence

number of the lane, and therefore the number of the RCC. Lane numbers must be in sequence.

2. For each lane, issue the numlanes command, supplying a 2-hex value (00-255) to indicate the total number of lanes involved in the scenario.

3. For each lane, issue the opmode command to indicate the type of operating mode that will apply to this antenna. Always set opmode to 0030, unless otherwise directed.

4. For each lane, issue the polls command to tell the reader the polling frequency and type of tag for which to poll.

The value can be 2-10 hex, with the first digit indicating how many consecutive times a poll type appears in a sequence. In this example, the poll type appears only once in the sequence.

The second digit, with a 0-7 hex value, tells the reader what kind of tag it is. In Table C-2, the first example is 0 (CALTRANS). The second example is 04 (alternating CALTRANS and TIRIS). The third example is 0152 (CALTRANS, TIRIS, L8000/ATCAS, HELP).

Note that "OF" is used to signal the end of each sequence. A series of up to 5 pairs of digit pairs can be part of one sequence. In Table C-2, the example sequences are 100f, 1040f, and 101520f

5. Issue the tiristh command to set the read threshold—that is, the number of times a TIRIS type tag must be seen before it is considered a valid tag. The value is a 3-hex number (00-255). With the threshold set to 1, the first read that occurs is passed on to the lane controller.

If the threshold value is set higher than 1, say to 5, then five reads must happen before being passed onto the lane controller. If less than five reads occur, than nothing will be sent. The reason for setting a high threshold is to avoid possible ricochet reads.

In toll plazas with relatively low speeds, use the threshold command to block possible ricochet reads inside the plaza


C: Polling Sequence

area. This is highly effective in preventing erroneous reads when lane discrimination is not used. Levels higher than 5 are not recommended for speeds up to 35 mph.

Note: TIRIS and CALTRANS transponders each have their own threshold setting. Active transponders, such as Mark IV are more sensitive to crossreads than transponders such as TIRIS, which is a passive tag.)


C: Polling Sequence


D: Optional Test Transponder

Appendix D Optional Test Transponder

Very useful to installation is the use of the optional test transponder (P/N T915Z-0001). It is a continuous read tag, which means once it is read, it will emit ..:continuous signal. Using the monitor PC, this signal is used to align the signal and set the RF footprint. See Aligning the Signal Laterally in either Appendix A or B.

Be sure you have issued the dupoff command. If possible, have one person viewing the monitor PC, while another holds the transponder tag.

For the latter, follow these instructions:

1. Between thumb and forefinger, hold the edges of the transponder with its antenna facing up. Tilt it 45 degrees so that the angle of the tag simulates that of one attached to a windshield.

between thumb and forefinger with palm facing away

Figure D-1. Test beeper transponder Hold transponder edges with antenna at top. The side with the velcro attachments must face the antenna. U

November 1995 AVI System Installation Guide D-1

D _ Optional Test Transponder

2. While walking with the transponder facing the antenna, systematically cover the area specified as the RF footprint. Monitor the read using the PC monitor.

3. If the coverage is not correct, adjust the antenna angle, as necessary.

Boresight =2 V/m

Antenna

Q Determine field strength on ri side of lane ® Determine field strength on flit ide of lane

Figure D -2. Walking test transponder through test area On the right side of the lane, walk in a straight line toward the antenna holding the transponder tag.

Repeat on the left side of the lane.. 0

D-2 AVI System Installation Guide November 1995

E: Monitor Personality Commands

Appendix E Monitor Personality Commands

The RCC is loaded with software version 3.1.1 (or later) that has preset settings applicable to your installation. Using the PC that is connected to the RCC, you can view the following commands on the monitor screen in the online Help menu. While the software is programmable, you should not have to change the software for initial installation.

The following monitor commands do not have parameters and are not case-sensitive:

abort Aborts program

audit Displays records in Audit Buffer on monitor disable Disables polling

dupon /Default Turns duplicate processing on

dupoff Turns duplicate processing off

enable Re-enables polling

person Displays current personality

reset Resets program (also aborts CW)

rfoff Disables RF

rfon Turn on continuous wave only (CW)

rdf p Read forward power

Table E-1 Monitor commands that do not have parameters

0

The monitor personality commands on the next page have parameters and are also not case-sensitive.

November 1995 AVI System Installation Guide E- 1

TI

•1

E Monitor Personality Commands

*and 1pe Yalue Purpose agency code 4 hex Agency code

caltransth level 00-255 (2 hex)? CALTRANS read threshold Number of times a CALTRANS type tag must be seen before it is considered a valid tag

discrim mode 2 hex Discrimination mode

01, 02, 03 Number of lanes=1, 2, 3

helprf level 00-255 (2 dec) HELP RF level

helpth level 00-255 (2 dec) HELP read threshold

00-FF Number of times a HELP type tag must be seen before it is considered a valid tag

lanerxm lane 2 hex Lane number of this rcc

nlmlanes number 00-255 (2 hex) Total number of lanes

opmode mode 4 hex Sets operating mode

OOnx n=1 (master), 2 (slave), 3(auto switching) x=0 (closed), 1 (open entry), 2 (open exit)

polls data 2-10 hex Poll sequence. Tells reader what kind of tag to poll for. Serves of up to 5 pairs of digit pairs. Each pair represents a sequence. n=repetition count (# of consecutive times a poll type appears in a sequence)

x=poll type (hex 0-7); 0=CALT RAN S 1=TIRIS (lane discrimination) 2=HELP 3=NOOP 4=alternating CALTRANS/TIRIS 5=L8000 (ATCAS) 6=L8004 (ATCAS) 7=alternating L8000/L8004 (ATCAS)

OF=end of sequence

pollt time 4 hex Poll-to-poll time 001e=closed or open exit; 0028=open entry

rccid ID 6 hex Reader ID

tirisrf level 00-255 (3 hex) TIRIS RF level

tilisth level 00-255 (3 hex) TIRIS read threshold

Number of times a TIRIS type tag must be seen before it is considered a valid tag

Table E-2 Mirror personality commands that have parameters

Programmable sdtvrare is loaded and preset in the RCC.

E-2 AVI System Installation Guide November 1995

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