Zebra Technologies WPT-3400 WherePort IV User Manual D1300rA 81208 ClassA

User Guide

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User Guide, WherePort IV D1300 REV A

User Guide, WherePort IV

Document Number D1300

Document Revision History

Revision Description of Change Date Approved

A Release per ECO C01554 08/12/08 D. Olsen

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TABLE OF CONTENTS

1.0 SCOPE 6

2.0 NOTICES AND REQUIREMENTS 6

2.1. FCC AND IC REQUIREMENTS 6

2.2. EUROPE R&TTE DIRECTIVE 1999/5/EC REQUIREMENTS 6

2.3. RF NOTICE 6

3.0 APPLICABLE DOCUMENTS 7

4.0 EQUIPMENT AND ACCESSORIES 7

5.0 SYSTEM OVERVIEW 7

5.1. THIS GUIDE 9

5.2. THE WHEREPORT IV 9

5.3. HEALTH TAG 10

5.4. WHEREPORT IV MOUNTING 10

6.0 THE WHERETAG 11

6.1. WHERETAG RESPONSES 12

6.2. USING THE WHEREPORT IV ID 14

7.0 MAGNETIC COMMUNICATION BASICS 16

7.1. MAGNETIC FIELDS 16

7.2. COVERAGE AREAS 18

7.3. POWER LEVEL 19

7.4. COVERAGE OVERLAPS 21

7.5. PHASES 21

7.6. SEQUENCING 22

7.7. DUAL WHEREPORT IVS 24

7.8. INTERFERENCE 25

7.9. THE FIELD METER 26

7.10. THE WHEREPORT IV LED 27

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7.11. CAPTURE AREA SIMULATOR 27

8.0 WHEREPORT IV IN THE FIELD 28

8.1. ZONES 28

8.2. AREA COVERAGE 29

8.3. PORTALS 29

8.4. MULTI-FLOOR INSTALLATIONS 32

8.5. LOCKED WHEREPORT IVS 32

8.6. MULTIPLE WHEREPORT IVS 33

8.7. SEQUENCED WHEREPORT IVS 37

8.8. SUMMARY 37

9.0 WORKING THRU AN APPLICATION 38

9.1. WAREHOUSE AND SHIPPING FACILITY 39

9.2. POSITIONING THE WHEREPORT IVS 41

10.0 USING THE SIMULATOR 42

10.1. SIMULATOR CONTROLS AND FEATURES 42

10.2. WHEREPORT IV CONFIGURATION 43

10.3. SAMPLE GRAPHS 46

10.4. ADJACENT WHEREPORT IVS 49

11.0 GLOSSARY 50

12.0 COMMAND SUMMARY 52

12.1. INITIAL POWER UP 52

12.2. PASSWORDS 52

12.3. COMMAND EXECUTION 53

12.4. TAG RESPONSES TO COMMANDS 53

12.5. COMMANDS 54

12.5.1. MESSAGE LENGTH 54

12.5.2. POWER 54

12.5.3. PHASE 55

12.5.4. WHEREPORT IV ID 55

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12.5.5. TAG ID 56

12.5.6. RESPONSE 56

12.5.7. COUNT 56

12.5.8. INTERVAL 57

12.5.9. TRIGGER 57

12.5.10. DATA 57

12.5.11. EXE 58

12.5.12. SEQUENCE MODE 58

12.5.13. SEQUENCE MODE MESSAGE NUMBER 58

12.5.14. VERSION 59

12.5.15. XPW 59

12.5.16. HWT (1) 59

12.5.17. LOADER 59

12.5.18. GQ 59

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List of Figures

Figure 1 WherePort IV............................................................................................................................8

Figure 2 Wiring Schematic for Power and Synchronization.................................................................10

Figure 3 WherePort IV Mounting Bracket............................................................................................11

Figure 4 Orientation ..............................................................................................................................17

Figure 5 Capture Area ...........................................................................................................................17

Figure 6 Orientation and Capture Area .................................................................................................19

Figure 7 Overlapping Uncertainty Areas ..............................................................................................21

Figure 8 Phase and WherePort IV Orientation......................................................................................22

Figure 9 Mode 1 ....................................................................................................................................23

Figure 10 Mode 2 ................................................................................................................................23

Figure 11 Mode 3 ................................................................................................................................24

Figure 12 Dual Where Port .................................................................................................................24

Figure 13 Magnetic Field Meter..........................................................................................................26

Figure 14 WherePort IV Coverage..........................................................................................................28

Figure 15 WherePort IV in a Doorway ...................................................................................................30

Figure 16 Loading Dock Doors...............................................................................................................31

Figure 17 Multi-Floor Schematic............................................................................................................32

Figure 18 Phasing for Wall Mounted WherePort IVs.............................................................................34

Figure 19 Phasing for Ceiling and Wall WherePort IVs.........................................................................35

Figure 20 Loading Dock Door Options...................................................................................................35

Figure 21 Over the Door WherePort IV Mounting .................................................................................36

Figure 22 The Warehouse Site ................................................................................................................38

Figure 23 WherePort IVs Mounted on the Site.......................................................................................40

Figure 24 Starting the WherePort IV Simulator......................................................................................42

Figure 25 Configuration Screen ..............................................................................................................43

Figure 26 Tag Orientations for the Graphs .............................................................................................44

Figure 27 Sample Graph..........................................................................................................................45

Figure 28 Sample Graph..........................................................................................................................46

Figure 29 Power Level Comparison Tag Orientation 2 ..........................................................................47

Figure 30 Power Level Comparison Tag Orientation 6 ..........................................................................48

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1.0 SCOPE

To provide a RTLS system overview and give some magnetic communication background information

relevant to the WherePort IV function. This guide shows the application of a WherePort IV device in the

field in association with tags and shows an application example and also shows the use of a simulator

tool to analyze the field pattern. The command summary is also reviewed.

2.0 NOTICES AND REQUIREMENTS

Proper safety procedures shall be taken for cabling connections, including powering the WherePort IV

using a POE cable or using an AC adapter.

2.1. FCC and IC Requirements

This device must operate in compliance with Federal Communications Commission (FCC) Rules and

Regulations Part 15.207, and 15.209 and IC Regulations RSS210. See FCC and IC registrations on label,

located on the bottom of the equipment for the FCC registration.

This equipment has been tested and found to comply with the limits of Class A devices pursuant to Part

15 of the FCC Rules and to RSS210 of Industry Canada. Operation is subject to the following two

conditions: First, the device may not cause harmful interference. Second, this device must accept any

interference which may cause undesired operation.

2.2. Europe R&TTE Directive 1999/5/EC Requirements

This device must operate in compliance with EN 301489-3, and EN 300 330-1/-2. The device complies

with an assessment for a TCF compilation for EMC, Radio, and Safety including IEC/EN 60950-1:2006.

See CE mark and safety agency registrations on label, located on bottom of the equipment.

This equipment has been tested and found to comply with the limits of Class 2 products (frequency band

not harmonized in EU) for the following countries: Austria, Belgium, Bulgaria, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lichtenstein, Lithuania,

Luxemburg, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland

and UK.

2.3. RF Notice

Any changes or modifications to WhereNet – a Zebra Company equipment not expressly approved by

WhereNet Corporation could void the user’s authority to operate the equipment.

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3.0 APPLICABLE DOCUMENTS

The following documents, latest revision, form a part of this document to the extent specified herein. In

the event of conflict the documents listed below shall govern.

• WPT-3400 WherePort IV

• 24827 Instruction Sheet, WherePort IV, Installation

• D1297 Outline Drawing, WherePort IV

4.0 EQUIPMENT AND ACCESSORIES

• 24830 WherePort IV, Remote Tag Exciter

• 25040 Bracket, Mounting, WherePort IV

• 25379 48VDC Power Adapter for US, C13

• 23820 AC Power Cord for Continental Europe, IEC 320, C13

5.0 SYSTEM OVERVIEW

The WherePort IV is a location indicator that is part of the Real Time Locating System (Figure 1). The

WherePort IV transmits a localized magnetic field. Since the field is confined (programmable from

approximately 3 feet to 20 feet) it is a reliable indicator of the location of key sites in the facility. When

WhereTags pass through the WherePort IV field they transmit the ID of the WherePort IV. The

WhereTag response can be programmed to indicate needed information about the status of the asset or

object to which the tag is attached.

WherePort IVs are mounted to fixed locations such as gates, loading docks, or cells along an assembly

line so that information required about the movement of assets through the facility will be gathered by

the RTLS. As tagged assets pass through the fields the tag transmits the WherePort IV ID that pinged it

and any other programmed status information.

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Figure 1 WherePort IV

The VSS system is programmed with the location of each WherePort IV and their ID. When a WhereTag

transmits a message that includes the ID of the WherePort IV field that it is in, the system knows where

the WhereTag is. This is particularly important when locating transitions is important or where the layout

of the site makes it difficult to have enough sensors to accurately locate the tag using RTLS.

Status LED

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5.1. This Guide

This guide presents the basic principles of WherePort IV communication and the major issues for placing

them on a site. It is intended to support both the planning for and the implementation of an RTLS

application using WherePort IVs.

It describes the WherePort IV, the WhereTag and its responses, the characteristics of the magnetic field,

and how the WherePort IV is used in a variety of applications. For more detailed information about the

WhereTag see the WhereTag Users Guide.

Also included is a description of the simulator program and how it is used to determine effective

WherePort IV site placement and configuration.

5.2. The WherePort IV

The WherePort IV is a round, dome shaped device, (7.62 inches in diameter and 2.62 inches thick). It is

designed for mounting indoors. It is powered by either 48 VDC POE (Power over Ethernet) or 48 VDC

power adapter. The complete specifications are shown in Table 1. The wiring schematic is shown in

Figure 2.

The WherePort IV is configured using commands sent through the Ethernet POE input or by a separate

RS-232 interface. These commands are described in Appendix B.

Table 1 WherePort IV Specifications

Size 7.62 in. Diameter x 2.62 Depth in. (19.35 x 6.66

cm)

Weight 1.9 lbs (0.83 Kg)

Voltage 48 VDC POE or 48 VDC Input Jack (DC Barrel

Conn)

Current 270 mA max (@48V)

PwrDiss 13.0 Watts (max)

Operating Temperature 0 to +40 ºC

Storage Temperature -40 to +70 ºC

Ingress Protection 33 IP (future Goal NEMA 12)

Humidity 0 to 100% Non-condensing

DC Power Connection RJ45 – POE Connector

DC Barrel Connector– Center contact is (+48V).

Phase Synchronization RJ11 cable from previous WherePort IV (twisted

wire type)

RJ11 cable to following WherePort IV (twisted wire

type)

Configuration Interface RJ45 – Ethernet Connector

RJ11(B Side) – RS232b Serial Connector

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Power over Ethernet

POE

AC/48VDC

Adapter

Master

Slave 1Slave 2

Sync OutSync In Sync InSync Out

RJ-11 RJ-11

RJ-45

Figure 2 Wiring Schematic for Power and Synchronization

Each 48 VDC Adapter supports one WherePort IV.

5.3. Health Tag

A WhereTag that is programmed to blink when there is no signal from the WherePort IV may be

mounted to each WherePort IV. This optional tag is called a health tag because a signal from this tag

indicates that there is something wrong with the WherePort IV that has caused it to stop signaling.

5.4. WherePort IV Mounting

The WherePort IV is mounted using a bracket (Figure 3). It can be mounted onto a wall or ceiling. For

details on installing the WherePort IV see the Installation Instructions.

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Figure 3 WherePort IV Mounting Bracket

6.0 THE WHERETAG

The WhereTag (Figure 4) is pinged by the WherePort IV and responds by transmitting a data message to

the RTLS. The WhereTag is a small device with a magnetic pick up coil and a RF transmitter. It is

mounted to movable assets such as trailers, vehicle assemblies, or storage bins. It transmits a

programmable blink signal. When operating without the WherePort IV, the blink is received by at least

three sensors which enable the system to locate the tag accurately on the site.

The WherePort IV signal is received by a pick up coil in the WhereTag. In the WhereTag III and

WhereTag IV, the coil is oriented along the length of the tag. In WhereTag II it is rotated 30º away from

the length of the tag.

Mounting Bracket

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Figure 4 The WhereTag III and WhereTag III ST

The solid line shows the orientation of the pick up coil for both WhereTags.

6.1. WhereTag Responses

The tag can be programmed to respond in a variety ways when it detects a WherePort IV signal. There

are three defined modes (see Figure 5).

Mode 1 The tag enters the field, blinks and then blinks again if it is still in the field after the

retrigger time out.

Mode 2 The tag enter the field, blinks and then does not blink again until it leaves the field and the

retrigger time out expires.

Mode 3 The tag enters the field, blinks and then blinks again after it has left the field and the

retrigger time out expires.

Coil Orientation

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Figure 5 The WhereTag in a WherePort IV Capture Area

In mode 1, the re-trigger is set for a time interval after the WherePort IV blink. When this interval

elapses, the tag will transmit a blink if the tag is still in the same WherePort IV field. Without the re-

trigger interval being set, the tag will continue blinking in response to the WherePort IV signal.

If the tag enters a new field, it will transmit a blink, even if the set interval has not elapsed (see Figure 2).

Figure 6 Retrigger Mode 1 and a New Capture Area

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In mode 2 the tag must both leave the WherePort IV field and the specified interval elapse before a

WherePort IV blink will occur. If the tag enters a new WherePort IV field it will immediately transmit a

blink (Figure 2).

Figure 7 Retrigger Mode 2 and a New Capture Area

In mode 3, the set interval must elapse and the tag leave the field, and then the tag will transmit a blink to

indicate that it has left the field. If the tag enters a new field, the tag transmits a blink when it enters the

field. If the re-trigger time out is reached before a new field is entered a blink is transmitted which

indicates the tag is out of the field.

Figure 8 Retrigger Mode 3 and a New Capture Area

6.2. Using the WherePort IV ID

The tag response can also be changed by the WherePort IV. Ports with ids from 0 to 255 are used only

when the alternate blink mode is required. These reserved ids are split evenly between IDs (128 – 255) to

mark the entrance of tag into the field and ids (0 - 127) to mark the exit of a tag from the field. The

significance of other tag IDs is shown in Table 2.

WherePort IVs can turn tags on and off as they enter and leave a site. As an example, WhereTags can be

permanently mounted to trailers. These trailers need to be tracked while they are on the site, but not after

they leave. There is no need for the tag to continue to blink while it is off site. WherePort IVs positioned

at entry and exit gates can turn the tags on when the trailers enter the yard, and off when they leave.

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Table 2 WherePort IV IDs

Tag Response ID Range

Standard WP Response Added Function

0 - 127 Yes Exit Alternate Blink Mode

128 - 255 Yes Enter Alternate Blink Mode

256 - 32,767 Yes

32,768 - 65,534 Yes (ID - 32,768 reported)

65,535 Yes + Response is data register

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7.0 MAGNETIC COMMUNICATION BASICS

The WherePort IV signal is carried by a magnetic field. The field’s shape and size is determined by the

orientation of the coil and the power level. It is not possible to aim the field. One of the characteristics of

a magnetic field is that it drops off rapidly. This produces a well-defined, localized field. These

characteristics make the WherePort IV an excellent device for monitoring tagged assets

7.1. Magnetic Fields

The magnetic field of the WherePort IV extends nearly equally in all directions creating an elliptical field

(Figure 9). The field has a direction that is determined by the position of the coil that creates it.

Figure 9 WherePort IV Field

The field extends in all directions around the WherePort IV. The direction of the field is suggested by

the way the field lines are drawn from the coil.

The field is detected and the signal received by a coil in the WhereTag. The orientation of the WherePort

IV’s coil in relation to the orientation of the tag’s coil affects its ability to detect the signal. The optimum

orientation is when the WherePort IV coil and the WhereTag coil are parallel to each other. The worst

orientation is when the coils are perpendicular to each other. As the coils move from optimum to worst

the ability of the Tag to detect the WherePort IV signal decreases (Figure 10).

WherePort Coil

Field Lines

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Figure 10 Orientation

When the coil in the tag and the port are parallel the range is the greatest. When the coils are

perpendicular the range is the shortest.

The relative positions of the two coils, WherePort IV transmitting and WhereTag receiving, determine

the range in which the tag will receive the signal. This range is the coverage area, or guaranteed capture

area (Figure 11). The guaranteed capture area is different for each orientation of the tag and the power

level of the WherePort IV.

Figure 11 Capture Area

The capture area is shown by the dark shaded area. This shape varies with the orientation of the

tag and the power level of the WherePort IV. The lightly shaded area is the uncertainty area.

Tag Orientation 2

Parallel Coils

Perpendicular

Coils

Guaranteed

Capture Area

Uncertainty Area

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7.2. Coverage Areas

The size of the coverage area is significant as well as its location or placement. It is important that the tag

be released from a field when it is no longer in the area being monitored by the WherePort IV.

There are three areas that are described for the field.

Guaranteed Capture All WhereTags at a given orientation will always be pinged in this area.

Uncertainty A WhereTag may or may not be pinged in this area.

Guaranteed Release A WhereTag will never be pinged beyond this range.

Since a tag may or may not be pinged in the uncertainty area, this area presents the most challenge for a

planner. If a single WherePort IV is installed, a tag that needs to be pinged may not be and a tag that

needs to be released may not be. These coverage areas must be well understood to be able to set up a site.

In the examples that follow these principles will be translated into real applications.

A WhereTag moving through a WherePort IV field will typically change its orientation with respect to

the WherePort IV. As the orientation changes the effective range of the WherePort IV will change.

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Figure 12 Orientation and Capture Area

Two maps are shown for two different WherePort IV mountings, horizontal (left) and vertical (right).

The two maps show two different tag orientations for each of the mountings.

Figure 12 shows the effects of WherePort IV and Tag orientation on the guaranteed capture area. These

maps are taken from the Simulation software.

7.3. Power Level

The size of the field is determined by the power setting for the WherePort IV. There are 31 power levels

for the WherePort IV. Setting the power level to 0 turns off the WherePort IV magnetic field. Table 3

shows the approximate capture and release ranges for each of the power levels when the tag’s orientation

is random and when it is fixed as it moves through the field.

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Table 3 Power Levels, Random and Optimum Fixed Tag Orientations

Capture Range Release Range Power Level

Random Optimum

Fixed

Random Optimum

Fixed

0 Off Off Off Off

1 1.0 2.2 3.5 3.5

2 1.2 2.5 4.0 4.0

3 1.3 2.7 4.5 4.5

4 1.5 3 4.7 4.7

5 1.6 3.2 5.0 5.0

6 2 4 6.0 6.0

7 2.2 4.5 7.0 7.0

8 2.3 4.7 7.5 7.5

9 2.5 5.0 8 8

10 2.8 5.5 8.7 8.7

11 3 6.0 9.5 9.5

12 3.2 6.3 10 10

13 3.4 6.7 10.5 10.5

14 3.5 6.9 11 11

15 3.6 7.1 12 12

16 3.8 7.5 13 13

17 4.1 8.2 14 14

18 4.9 9.7 15 15

19 5 10.0 16 16

20 6 12.0 19 19

21 6.8 12.8 20 20

22 7.3 14.7 22 22

23 8 16.0 25 25

24 8.5 17.0 26 26

25 8.7 17.4 27 27

26 8.8 17.6 28 28

27 9 18.0 29 29

28 9.5 18.5 33 33

29 10 20.5 31 31

30 11.0 22.0 33 33

31 11.5 23.5 35 35

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Random orientation means that the tag may take any of the possible positions relative to the WherePort

IV. Fixed tag orientation means that the motion of the object to which the tag is attached will always

present the tag in the same position relative to the WherePort IV. A major difference between the random

and the fixed orientation is the size of the uncertainty area. It is significantly reduced when the tag has

both a fixed and an optimum orientation in the field.

Figure 13 Overlapping Uncertainty Areas

7.4. Coverage Overlaps

When positioning WherePort IVs it is not always possible to prevent their fields from overlapping.

Overlapping the uncertainty areas of two WherePort IVs does not produce a guaranteed capture area. It

produces an area where a tag may be pinged by either one or the other WherePort IVs or none.

When the fields of two WherePort IVs must be overlapped to cover a large area (Figure 13) it is

necessary to set the phases of the two WherePort IVs. Both WherePort IVs (or more if more fields are

overlapping) must also have the same ID number. If the phases are not set, it may be impossible or

difficult for a tag in the field to accurately report the ID of the WherePort IV for the field it is in.

7.5. Phases

When two are more WherePort IVs are used to cover a large area they must be phased to reduce the

interference between the two fields. WherePort IVs mounted on the ceiling might be set to 0º and on a

wall 90º. Figure 14 shows the correct phase settings for four orientations of the WherePort IV. The

phases are set with reference to the orientation of the master WherePort IV.

Field Overlap

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A WherePort IV set to 0º phase is defined as the master and all the other WherePort IVs are then

connected to it using the phase wire connections. Phased WherePort IVs must all have the same ID.

Figure 14 Phase and WherePort IV Orientation

7.6. Sequencing

WherePort IVs that have been connected electronically can also operate in the sequence mode.

Sequenced WherePort IVs do not transmit at the same time. The first WherePort IV sends its message

and then shuts off its field while the next WherePort IV in the sequence sends its message. The number

of times each WherePort IV sends its message is set using the CMCn command. The number of

WherePort IVs in the chain is set using the CMWn command. See Figure 15 through Figure 57.

The master WherePort IV LED in a group of sequenced WherePort IVs is green when active. The

slave WherePort IV LEDs are yellow when they are active. The LEDs are all off when the WherePort

IVs are not active.

0º Master

90º

180 º

270 º

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Figure 15 Mode 1

One WherePort IV is active at a time. A master and two slaves are shown. WhereWand WPSeq

Count (or RS232 CMWn) = 2.

Figure 46 Mode 2

More than one WherePort IV may be active at a time. A master and three slaves are shown. One and

three are active while 2 and 4 are inactive. WhereWand WPSeq Count (or RS232 CMWn) = 1.

Master WP #1

Slave WP #2

Slave WP #3

Master WP #1

Slave WP #2

Slave WP #3

Slave WP #4

Active

Inactive

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Figure 57 Mode 3

All WherePort IVs may be off part of the time. A master and one slave are shown. One is active, then

two, then both are inactive. WhereWand WPSeq Count (or RS232 CMWn) = 2 or higher.

With sequencing, WherePort IVs that might have conflicting fields if they were on at the same time, can

be placed to indicate position or transitions. An example is narrow parking lanes in a warehouse facility.

7.7. Dual WherePort IVs

The dual WherePort IV is a bracket with two WherePort IVs mounted to it, oriented 90º from each other

(Figure 68). They ensure a guaranteed capture range and eliminate the need for multiple mounting sites.

Typically the dual WherePort IV is used when the orientation of the tag can not be fixed. They also

simplify placement in locations that are larger than the guaranteed capture range of a single WherePort

IV (see Figure19). Dual WherePort IVs are always phased with one set as the master at 0º and the other

at 90º.

Figure 68 Dual Where Port

Master WP #1

Slave WP #2

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Figure19 Coverage Pattern

A single (A), adjacent (B), and dual WherePort IV (C) field are shown. The fields shown are for

WherePort IVs at power level 8 and mounted at the same height as the WhereTag.

7.8. Interference

Steel objects and some devices can interfere with the WherePort IV field and change its shape and range.

Some kinds of structures will affect the range of the WherePort IV. Mounting the WherePort IV on the

broad face of a steel I-beam reduces the coverage on the front and back of the WherePort IV.

The field can also be extended or ducted by steel in windows, metal studs, conduit, or duct work. This is

most likely to occur when the WherePort IV is within one to two feet of the steel and the tag is also close

to the steel. This could lead to an unwanted increase in the size of the field.

Magnetic interference can block communication between the WherePort IV and the tag. The most

common sources of magnetic interference are CRT monitors, electric motors, vehicle RFID anti-theft

ignition systems, and other WherePort IVs. A WherePort IV may not ping a tag that is within one to two

feet of an operational monitor or industrial motor. The field strength meter can be used to check for

interference.

A B C

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Figure 20 Magnetic Field Meter

7.9. The Field Meter

The field meter is a WhereTag connected to a voltage meter so that it can detect and display the strength

of the WherePort IV field (Figure 20). By walking around an installed WherePort IV the strength of the

signal throughout the area to be monitored can be measured. The tag can be positioned to match its

mounting position on the tracked asset. Experimenting with the field meter can help to clarify the

coverage area of the WherePort IV.

After the installation of WherePort IVs at a facility, the field meter is used to test that the field coverage

is as it was planned to be. If gaps or problems with the coverage are found they can be corrected before

the facility is put into operation. See the Magnetic Field Meter User’s Guide (P/N D0755).

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7.10. The WherePort IV LED

On the top of the WherePort IV is an LED that indicates the status of the WherePort IV (see Table 4).

Table 4 LED Status Indicator

Condition WherePort IVs LED Status

Power up reset All No Color/Green

Power = 0 All Green

Phased Master Green

Phased Slave Yellow

Sequenced Master, field on Green

Sequenced Master, field off No color

Sequenced Slave, field on Yellow

Sequenced Slave, field off No color

7.11. Capture Area Simulator

The capture area simulator calculates and maps the capture area for several different WherePort IV and

WhereTag orientations. The simulator is described in Section 10.

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8.0 WHEREPORT IV IN THE FIELD

The basic principles of the WherePort IV must be translated into applications in the field. Doors,

corridors, rooms, parking lots do not necessarily conform to the requirements of the WherePort IV field.

In this chapter several common situations are discussed in order to illustrate how the characteristics of

the WherePort IV affect their positioning on a site.

Figure 71 WherePort IV Coverage

In the applications that follow the WherePort IV field will be illustrated as shown in Figure 71. The

illustration shows only two dimensions of what is always a three dimensional field. The field can be

imagined as a series of waves that are further apart as they move out from the coil. The overall shape is

like an ellipsoid, an egg shaped object, extending out in all directions from the WherePort IV.

In the examples that follow, the WherePort IV field is described. It must be remembered that the capture

area is what is important. The field is shown to simplify the presentation.

8.1. Zones

In some applications it is not necessary to be able to determine the precise position of an asset. All that is

needed is to know when the asset is in one or more key zones of the facility. Fewer antennas are required

to define zones.

While accuracy may not be essential, reliability will be. By placing one or more WherePort IVs in a

zone, the system can reliably determine that a tag asset has entered and is still in a zone.

Uncertaint

y

Covera

g

e

Guaranteed Coverage

WherePort

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8.2. Area Coverage

There may, however, be many areas where different activities occur that must be monitored. Well

positioned WherePort IVs can define these areas of interest by pinging tagged assets as they enter them.

Examples are assembly stations in a factory, loading docks, or different types of rooms in a hospital. One

or more WherePort IVs mounted at the station will ping a tag whenever the tag enters the area. If more

than one port is placed in a large area, they must all have the same ID.

The WherePort IV can be particularly important if the structure of the facility obstructs the line of sight

visibility to location sensors or location antennas. The garages in a repair facility may have metal walls.

Multiple sensors, likely four, would need to be mounted around the bay to guarantee a signal that locates

a vehicle in the bay.

When more areas are to be monitored, more issues must be considered in planning the location of the

WherePort IVs.

• What will the orientation of the tag be as it moves through the area?

• Will tags be pinged while they are moving past but not through the area?

• Are there sources of interference that may restrict the capture area?

• Will WherePort IVs be close enough to each other that their fields may overlap?

8.3. Portals

An additional complexity may arise if the best way to monitor assets is to detect when an asset enters or

leaves the area through a door, gate, or similar portal. WherePort IVs mounted at the portals of these

areas will ping a tag, indicating that the tagged asset has passed through and is not in the area.

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Figure 82 WherePort IV in a Doorway

To enter the room, an object must pass through the guaranteed capture range of the WherePort IV.

The placement of a WherePort IV in the doorway might seem simple. Figure 82 shows this installation.

Any tagged asset passing through the doorway must pass through the guaranteed capture range.

However, an object passing down the corridor would also be pinged by the WherePort IV. If the

WherePort IV is mounted to the top of the doorway, it might be below a space on the floor above that is

part of the application as well. The WherePort IV field might extend far enough into the second floor to

ping a WhereTag moving through a completely separate part of the facility.

The WherePort IV may need to be mounted inside the room to prevent pinging traffic along the corridor.

Its power level may need to reduced so that the range does not extend beyond the actual portal. The

placement of the tag on the asset may need to be adjusted, perhaps by placing it closer to top of a vehicle,

so that only the portal WherePort IV will ping it.

When an area is monitored using portals, all portals must be covered. If a path into the area is not

covered by a WherePort IV, tagged assets may enter or leave through the uncovered path.

Corridor

Functional Area

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Figure 93 Loading Dock Doors

Spacing of loading dock doors makes it impossible to assign unique WherePort IV IDs to each of the

doors.

If, instead of a single door, a series of doors (for example on a loading dock) or bays are too close

together, the fields may overlap so that it is not possible to assign a unique WherePort IV ID to each of

the doors. Even if the doors are far enough apart so that the fields do not overlap, the fields may cover so

much of the adjacent area that false pings are created by tags that are passing by and not arriving at the

doors (see Figure 93).

Some of these issues might be solved by sequencing the WherePort IVs, which will be covered later in

this chapter.

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Figure 104 Multi-Floor Schematic

Shows a floor configuration so that the WherePort IV field extends into the second floor.

8.4. Multi-Floor Installations

When activities are tracked on several floors, the vertical position of the WherePort IV and the extent of

its field must be carefully considered. If the field extends into the floor above, a tag moving on the upper

floor may be activated by the WherePort IV on the lower floor. This will produce an incorrect location

for the tag.

The height of the floor together with the utility space between floors must be considered so that the

WherePort IV is mounted at a height that prevents tags on the floor above from being activated (Figure

104).

The WherePort IV power setting can be set so that the range is reduced. The tags may also be mounted

lower on the asset to permit lower placement of the WherePort IV.

8.5. Locked WherePort IVs

There may be areas on a site where once a tagged asset has entered it should not be located using RTLS.

Movement along an assembly line may be more accurately tracked using only the WherePort IV signals.

Floor 1

Drop Ceiling

Floor 2

Drop Ceiling

Utility Space

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Where room coverage is needed the RTLS algorithm could indicate that a tag is outside a room when it is

not.

WherePort IVs are defined as locked using the software of the SystemBuilder. No setting in the

WherePort IV is needed. After a tag pings that it has detected a locked WherePort IV the tag will be

ignored until it is unlocked. It is unlocked by detecting an unlocked WherePort IV.

Tag movement must be clearly understood to make sure that a tag that enters a locked WherePort IV

field will also enter an unlocked WherePort IV field. If a tag is inadvertently locked by a WherePort IV it

will be ignored by the system until it enters the field of an unlocked WherePort IV.

Typically locked WherePort IVs are used to track tags into a relatively small and confined space. While

tags are in this space they will be ignored. Upon leaving the space they will pass an unlocked WherePort

IV and from then on be tracked normally.

8.6. Multiple WherePort IVs

Some locations require more than one WherePort IV to insure adequate coverage. Examples include a

long corridor, a large number of loading dock doors (from the inside), or a large doorway.

If a space is large enough, separate WherePort IVs with separate IDs may be used. Problems arise with

areas that must be monitored uniquely that are larger than the coverage area of single WherePort IV. In

this case the possible mounting options must be considered.

The placement of WherePort IVs with overlapping coverage requires attention to a number of issues. The

first is phasing. Whenever the coverage fields of two or more WherePort IVs overlap, the phases of the

WherePort IVs must be set. When WherePort IVs are phased, one is always designated as the master

with its phase set to 0 (see Figure 115) and all phased WherePort IVs must be set to the same ID.

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Figure 115 Phasing for Wall Mounted WherePort IVs

Viewed from the top.

Figure 115 shows a corridor or large space with WherePort IVs mounted on the different walls to

effectively cover the entire area. This means that the phase of each WherePort IV must be set as

indicated.

0º Master

180 º

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Figure 126 Phasing for Ceiling and Wall WherePort IVs

A large doorway may require three WherePort IVs to reliably detect the passage of a tagged asset

through it. In the example shown in Figure 126 coverage requires a WherePort IV on each side of the

doorway and on the ceiling. Again each WherePort IV must be phased accordingly.

Figure 137 Loading Dock Door Options

Viewed from the side.

Loading dock doors are frequently too close together for each of them to be monitored by a different

WherePort IV. If unique identification of passage through a given door is required, a more complex

solution will be required.

0º Master

90 º

180 º

0 º 0 º 180 º

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Figure 137 and Figure 148 show two ways of solving the problem. The example in Figure 137 uses a

WherePort IV to cover two doors. Since these WherePort IVs are mounted in different orientation on the

walls, their phases must be set as well. Figure 148 shows a WherePort IV mounted above each door. The

phases for these ports can all be set to 0 but they must still be phased together with one of the ports

identified as the master.

The orientation of the tags will also affect the location of the WherePort IVs. If the tag orientation is

horizontal, then the top solution is best so that the WherePort IV field will be maximized. If the tags are

oriented vertically, then the lower solution, with the WherePort IVs mounted over the doors, will be best.

Figure 148 Over the Door WherePort IV Mounting

The dotted line ellipse shows the approximate shape of the coverage area if the tag is oriented

horizontally rather than vertically.

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Figure29 Sequenced WherePort IVs on Parking Lanes

8.7. Sequenced WherePort IVs

Figure29 shows the use of sequenced WherePort IVs to accurately identify which lane a vehicle has

entered. Sequenced WherePort IVs are turned on and off. WherePort IVs 1 and 3 are on while 2 and 4 are

off and then 2 and 4 are on while 1 and 3 are off. If a tag is pinged by 1 and 2 it is in lane 1. If it is pinged

by 3 and 2 it is in lane 2.

8.8. Summary

Each application will present a unique combination of the principles demonstrated by the examples in

this chapter and thus require different configurations to create a successful application. In the next

chapter, guidelines for planning and designing an application will be discussed.

1 3

2 4

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9.0 WORKING THRU AN APPLICATION

To effectively place WherePort IVs the site and the required information from the site must be carefully

studied. In this chapter a simple site will be presented and issues about WherePort IV placement will be

discussed and mounting locations for WherePort IVs found. Note that this study is regarding an outdoor

application. Although the WherePort IV is an indoor device, the information learned here is relevant for

other applicatons.

Figure 150 The Warehouse Site

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9.1. Warehouse and Shipping Facility

Events or positions that need to be monitored in some way.

What must be tracked.

Trailers entering the yard

Trailers at the loading dock

Trailers in the waiting, parking area

Trailers leaving the yard

Issues affecting the placement of the WherePort IV.

Are there any obstacles or structures that will affect the field?

Where will the WhereTags be mounted?

Will their orientation be controlled while they are in a WherePort IV field?

The first and most important step in creating a successful WherePort IV application is to define what

information must be obtained from the WherePort IV. Is the passage of an asset past a particular point

important?

How does the use of WherePort IVs fit with the RTLS? Is it impossible to mount enough sensors or do

physical barriers make it impossible to get reliable location signals? Is the RTLS unable to accurately

track when an asset has reached a precise location? Both aspects of the installation must be considered to

make sure that the most accurate and reliable information that is critical to operation is obtained.

Within a large area covered by RTLS more precise information about the location of an asset may be

needed. This can be done by installing a WherePort IV at this location.

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Figure 161 WherePort IVs Mounted on the Site

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9.2. Positioning the WherePort IVs

What will the tags be mounted to and how will the objects move? Will the tag maintain its orientation as

it moves through the site or will it move? Will it move only in the horizontal dimension or will it be set

up on end and changed vertically as it moves? Will the tag be mounted close to the floor or some

distance above it? How much flexibility will there be in the mounting of the tag? The orientation of the

tag with respect to the WherePort IV is one of the most important determinants of the coverage field.

What kinds of interference are on the site?

identifying where on the site this information must be gathered, and determining Creating a map of the

site.

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10.0 USING THE SIMULATOR

The WherePort IV simulator (WhereNet p/n D0910) is a tool for exploring the best solutions for

WherePort IV placement and for better understanding the basic characteristics of WherePort IV

communication.

Because of the number of variables that affect the response of the tag to the WherePort IV field, it is

helpful to examine the response using the simulator. The number and placement of WherePort IVs, the

orientation of the tag while it is in the field, and the distance of the WherePort IV from the tag all interact

to determine this response.

10.1. Simulator Controls and Features

Figure 172 Starting the WherePort IV Simulator

Figure 172 shows the starting screen of the simulator. There are seven options for WherePort IV

placement:

Single WherePort IV Mounted vertically

Single WherePort IV Mounted horizontally

Dual WherePort IV Mounted horizontally

Dual WherePort IV Mounted Vertically

Two Adjacent WherePort IVs Mounted vertically, facing sideways

Two Adjacent WherePort IVs Mounted vertically, facing forward

Two Adjacent WherePort IVs Mounted horizontally

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The magnetic field extends in all directions from the WherePort IV. Its position does, however, affect the

direction of the field and therefore its relation to the position of the tag. It is the direction of the field that

is important when reviewing the different orientations of the WherePort IV.

Figure 183 Configuration Screen

10.2. WherePort IV Configuration

The WherePort IV position to be simulated is configured on the WherePort IV configuration screen

(Figure 183). There are two parameters that must be set:

Power Level Select a power level from 1 to 8. The highest power level is 8 on this simulator. To

convert this to the WherePort IV power level, multiply the simulation power level by 4 and subtract 1 to

achieve the WP4 level. This will only test a few of the 31 power steps.

Tag to WP IV Height (ft) The relationship between the height of the WherePort IV position and the

WhereTag position (0 to 20 feet).

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Figure 194 Tag Orientations for the Graphs

The graphs are calculated based on the tags maintaining the same orientation while it moves. Its

orientation to the field will therefore change.

For each WherePort IV position, graphs are drawn for six different WhereTag orientations. These

orientations and the number designations of each are shown in Figure 194 The tag orientation is with

reference to the position of the WherePort IV.

There are also options for controlling the presentations of the graphs. The scale sets the dimensions of the

graph. A five foot scale displays the capture area for five feet in each direction. A sample graph is shown

in Figure 205.

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Figure 205 Sample Graph

The graph shows the guaranteed capture area in green and the uncertainty area in yellow for a single

WherePort IV, mounted horizontally, with a power level of 4, and a tag to WherePort IV height of 4

feet for a tag with orientation 2. The scale is 10.

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Figure 216 Sample Graph

Shows the same configuration as Figure 4 except the tag is in the 6 orientation.

10.3. Sample Graphs

The importance and usefulness of the simulator can be shown by looking at two graphs showing two

different tag orientations while all other options are identical. Figure 205, with orientation 2, shows a

guaranteed capture area that is approximately ten feet long and four feet wide. Figure 216, with

orientation 6, has four very small guaranteed capture areas that are not contiguous. These settings would

likely not be effective for any application.

Figure 227 and Figure 238 use the same settings as Figure 205 and Figure 216 except the power setting is

8 instead of 4.

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Figure 227 Power Level Comparison Tag Orientation 2

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Figure 238 Power Level Comparison Tag Orientation 6

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Figure 39 Adjacent WherePort IV Configuration

10.4. Adjacent WherePort IVs

Adjacent WherePort IVs require that some additional variables be set:

Power Level Select a power lever from 1 to 8. The highest power level is 8. Note that the WP4 power

level has 31 steps with 31 as the max. To convert between this program range to the WP4, multiply the

program power step by 4 and subtract 1 to achieve the WP4 power level.

Tag to WherePort IV Height Set from 0 to 20 feet.

Distance between WherePort IVs (feet) 0 to 50 feet in five foot increments.

Are the WherePort IVs Synchronized Yes or no (Yes, when wired together).

WherePort IV #1 Phase 0, 90, 180, or 270.

WherePort IV #2 Phase 0, 90, 180, or 270.

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11.0 GLOSSARY

blink A signal sent by a WhereTag to the RTLS system. A blink may

contain 1 to 8 sub-blinks.

coverage area The area in which a WhereTag will be pinged by a WherePort IV

signal.

dual WherePort IV Two WherePort IVs on a bracket, oriented at 90 degrees to each

other.

guaranteed WP capture area The part of the WherePort IV field where a tag will be pinged.

WP health tag A WhereTag mounted to a WherePort IV to indicate if the

WherePort IV is operating correctly.

WP field The magnetic field produced by the WherePort IV. It is not the

same as the coverage area.

guaranteed WP release area The point beyond which it is certain that a tag will not be pinged.

locked A tag may be locked by a WherePort IV. A locked tag is invisible

to the RTLS system. This tag must be paired with a WherePort IV

that unlocks the tag.

Master In a group of phased WherePort IVs, one must be set as the master.

The phase setting for the master is 0.

orientation Magnetic coils have an orientation. The relationship between the

orientation of the pick up coil in the WhereTag and the transmit coil

in the WherePort IV affects the range of the WherePort IV.

phase WherePort IV setting required when uncertainty areas of coverage

overlap between two or more WherePort IVs. The possible phase

settings are 0, 90, 180, and 270.

ping What a WherePort IV does to a WhereTag when the tag is in the

field.

sequence WherePort IVs linked together which transmit at intervals set by the

master WherePort IV in the sequence.

simulator A software package for experimenting with coverage areas.

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slave All WherePort IVs other than the maser in a group of sequenced or

phased WherePort IVs.

uncertainty area The part of the WherePort IV field where a tag may be pinged but

where it is also possible that it will not be pinged.

WherePort IV ID A number from 0 to 32,000 that identifies each WherePort IV to the

system.

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12.0 COMMAND SUMMARY

This appendix describes the commands used to configure the WherePort IV.

• All commands and responses are ASCII character strings.

• ACK responses are the three character string ‘ACK’ and not the 0x06 non-printable character.

Similarly, NAK responses are the three character string ‘NAK’ and not the 0x15 non-printable

character.

• All numbers (represented by ‘n’ in command list) sent are the ASCII representation of the value.

For example, the number 14 is sent as the two ASCII character string ‘14’ and not the single byte

0x0E. The number 7 is sent as the single ASCII character ‘7’ and not the single byte 0x07.

12.1. Initial Power Up

When theWherePort IV is initially powered up, it will transmit the following string.

{CR}{LF}

WhereNet{CR}{LF}

WherePort IV vx.xx <CR><LF> (where x.xx is the firmware version)

12.2. Passwords

Every command must start with a four character password followed by a colon. For example, if the

password is 1234 the query command would be entered as follows:

1234:VER?<CR><LF>

The WherePort IV will respond with NAK to any command that does not start with the correct password.

The WherePort IV ignores space characters, carriage return characters, and the line feed character

because it signals the end of a command. These three characters (0x0D, 0x0A, 0x20) may not be used in

passwords. All other byte values are legal.

The password is set to the default value of 1234. The only command that does not require the password is

the HWT n command. The HWT n command sets and queries the password. To access the password, the

host must send the following three commands in order. Any other command, or any change to the

sequence will reset the access flags. The sequence of commands is:

HWT 3 Set flag 1 of 3 only if all 3 flags are cleared.

HWT 4 Set flag 2 of 3 only if flag 1 is set and 2 and 3 are clear.

HWT 5 Set flag 3 of 3 only if flags 1 and 2 are set and 3 is clear.

HWT 6 Set password to 1234 only if all 3 access flags are set.

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The password can be set using the ****:XPW **** command. Changes to the password will take effect

immediately. The changes affect only the current session unless the host sends the WherePort IV an

execute command (****:EXE). Only after receiving an execute command will the new password be

written into flash memory and read on power up. Without the execute command, the password will return

to its previous value if the WherePort IV is powered down.

12.3. Command Execution

The following commands require the execute command (****:EXE) before they will be saved in flash

memory and sent to the magnetic field generator:

MSG, PWR, PHS, WID, TID, RSP, CNT, INT, TRG, DAT, CMW, CMC, XPW

A query command will return the newly entered values, even though the execute command has not been

sent. The WherePort IV will not be operating under these values until the execute command is sent.

12.4. Tag Responses to Commands

Unless noted otherwise, all commands will produce one of the following responses by the WhereTag:

ACK message OK

NAK message not recognized or bad format

NAK2 message parameter out of range

There are two other possible acknowledgments that are used primarily by data commands. Their use will

be noted in the command summary.

NAK3 The tag is busy and will not blink data

BSY…ACK The tag is busy with a WherePort IV blink. The command will be responded to when the

tag completes the WherePort IV blink and is not busy, at which time a ACK response will be sent.

SSS n Response to a query where SSS is the command and n is the parameter.

All tag response strings consist of a carriage return / line feed, the actual response string, another

carriage return / line feed, and are followed by the > prompt character.

{CR}{LF} ACK{CR}{LF}>

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12.5. Commands

12.5.1. Message Length

Set the length, in bits, of the WherePort IV message. There are six possible values.

n Value

1 10 bit

2 28 bit

3 44 bit

4 144 bit

5 144 bit with payload CRC1

6 144 bit with payload CRC2

Example:

MSG 1<cr>

Sets the message length to 10 bits.

Considerations:

Message length affects the dwell time when using sequenced WherePort IVs.

12.5.2. Power

Set power level, from 0 to 31. When set to 0 the WherePort IV power is off.

PWR n<cr>

Increasing the power level increases the range.

Example:

PWR 31<cr>

Sets the power level to 31.

Considerations:

Lower power levels are used to make sure the capture area of the WherePort IV is restricted to the zone

or area to be monitored.

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12.5.3. Phase

Set the phase.

PHS n<cr>

Valid range for n is 0 through 3 where 0 equals 0º, 1-90 º, 2-180 º, and 3-270 º.

Example:

PHS 2<cr>

Sets the phase to 2.

Considerations:

When WherePort IV fields overlap, the phase of each WherePort IV must be set to match to placement of

the ports.

12.5.4. WherePort IV ID

Sets the WherePort IV Id. The valid range is 0 to 32,767.

WID n<cr>

Example:

WID 4<cr>

Sets the WID to 4.

Considerations:

WherePort IV IDs 0 through 255 are used for an alternate blink mode. When a WhereTag is pinged by a

WherePort IV with an ID less than or equal to 255 the tag is converted to the alternate blink mode.

CAUTION: Do not use the alternate blink mode without consulting the WhereNet technical staff.

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12.5.5. Tag Id

Set the tag ID: (for 144 bit messages only). The valid range is 0 to 4,294,967,295.

TID n<cr>

Example:

TID 4<cr>

Sets the tag id to 4.

Considerations:

The tag ID is only set using a 144 bit message.

12.5.6. Response

Set the tag WherePort IV response blink type (applies only to 27 bit and 44 bit messages):

RSP n<cr>

72 bit

144 bit

Example:

RSP 1<cr>

Sets the response blink type to 72 bits.

12.5.7. Count

Set the WherePort IV response blink count (44 bit message only):

CNT n<cr>

Valid range for n is 0 through 15.

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Example:

CNT 4<cr>

Sets the blink count to 4.

12.5.8. Interval

Set the WherePort IV response blink interval (44 bit message only ) where n is 0 to 7.

INT n<cr>

12.5.9. Trigger

Set the re-trigger response (44 bit message only).

TRG n<cr>

Where n is a value 0 through 15.

Example:

TRG 4<cr>

Sets the re-trigger response to 10 sec.

12.5.10. Data

Set the 96 bit data payload (144 bit message only).

DAT [string]<cr>

String of 24 ASCII-HEX characters; set the 96 bit data payload (144 bit message only).

String of 22 ASCII-HEX characters: set the 96 bit data payload, payload CRC automatically calculated

(144 bit message only).

Example:

DAT string<cr>

A string of 24 ASCII-HEX characters to set the 96-bit data payload of the WherePort IV.

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12.5.11. EXE

EXE n<cr>

Send message to magnetic field generator and the flash memory.

12.5.12. Sequence Mode

Set number of WherePort IV in the chain for sequencing mode.

CMW n<cr>

Where n is a value of 1 through 15. A value of 0 disables sequence mode. A value of 1 means that there

is a master and 1 slave.

Example:

CMW 2<cr>

Sets the number of WherePort IVs in the chain to 3, one master and 2 slaves.

12.5.13. Sequence Mode Message Number

CMC n<cr>

N is a value from 0 to 15. Sets the number of messages to send for each WherePort IV in sequence mode.

0 disables sequencing mode.

The dwell time (how long it takes to send the programmed number of messages) increases as the number

of messages increases. Table 1 lists the dwell times for the available combinations of message lengths

and message numbers. The types are listed in the left column. The number of messages are listed in the

body of the table. The dwell time is shown in the header column.

Table 1 Dwell Time (in seconds)

Message

Type 0.2 0.5 1.0 2.0 3.0 4.0 5.0 10 15 20

1 25 64 128 255

2 12 30 60 120 181 255

3 8 20 41 82 123 164 205

4 3 7 14 27 41 55 68 137 205 255

5 3 7 14 27 41 55 68 137 205 255

6 3 7 14 27 41 55 68 137 205 255

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12.5.14. Version

Set the software version number.

VER m.nn<cr>

Where m is the major version and nn is the minor version.

Example:

VER 2.01<cr>

Sets the WherePort IV software version number to 2.01.

12.5.15. XPW

Set the password to the four character ssss.

XPW ssss<cr>

12.5.16. HWT (1)

Used to test the ISP port pins and set the WherePort IV password access flags.

HWT n<cr>

Where n is a value of 1 through 6. A value of 6 sets the default password.

Example:

HWT 2<cr>

12.5.17. Loader

LDR n/a WherePort IV Loader vm.nn

Enter loader mode to allow firmware update. It will time out after 80 seconds if there is no transfer.

Transfer format is xmodem 128 byte.

12.5.18. GQ

There are five different GQ commands. A number of arguments are possible for several of these

commands. The commands govern the operation of the WherePort IV when the mode is changed by the

system in response to a particular tag.

User Guide

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User Guide, WherePort IV D1300 REV A

GQ1 Set message length = 10 bit

Execute immediately

GQ1 n Set WPID = n, where 0 ≤ n ≤ 7

Set message length = 10 bit

Execute immediately

GQ2 Set message length = 28 bit

Execute immediately

GQ2 n Set WPID = n, where 0 ≤ n ≤ 32,767

Set message length = 10 bit

Execute immediately

GQ3 n,m,p,q n = 0x0-0x7FFF

m = 0x0-0xF

p = 0x1-0x7

q = 0x0-0xF

Arguments are in upper case ASCII-Hex format

Set message length = 44 bit

Set WPID = n

Set CNT = m

Set INT = p

Set TRG = q

Execute immediately

GQ4 Set message length = 144 bit

Execute immediately

GQ4 n Set Tag ID n = 0 to 7FFF

Argument is in ASCII-Hex format

Set message length = 144 bit (CRC)

Execute immediately

GQ4 s Set message length = 144 bit (CRC)

Set data string = s (22 or 24 chars)

String is in ASCII-Hex format

Execute immediately

User Guide

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User Guide, WherePort IV D1300 REV A

GQ4 n,s n = 0 to 7FFF

s = string

Set message length = 144 bit (CRC)

Set Tag ID = n

Set data string = s (22 or 24 chars)

Execute immediately

GQ5 n N = 0 to 7FFF

Set message length = 144 bit (CRC)

Set Tag ID = n

Execute immediately

GQ5 s Set message length = 144 bit (CRC)

Set data string = s (22 or 24 chars)

Execute immediately

GQ5 n,s n = 0 to 7FFF

s = string

Set message length = 144 bit (CRC)

Set Tag ID = n

Set data string = s (22 or 24 chars)

Execute immediately

GQ6 n 0 to 7FFF

Set message length = 144 bit (CRC)

Set Tag ID = n

Execute immediately

GQ6 s Set message length = 144 bit (CRC)

Set data string = s (22 or 24 chars)

Execute immediately

GQ6 n,s n = 0 to 7FFF

s = string

Set message length = 144 bit (CRC)

Set Tag ID = n

Set data string = s (22 or 24 chars)

Execute immediately

Zebra Technologies WPT-3400 WherePort IV User Manual D1300rA 81208 ClassA

Zebra Technologies Corporation WherePort IV D1300rA 81208 ClassA

Users Manual

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