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WherePort III
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Zebra WherePort III User Manual

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User Guide
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WherePort III User Guide D948 Rev C
©2010 Zebra Enterprise Solutions. WherePort and all product names and numbers are Zebra Enterprise Solutions trademarks. All other trademarks are the property of their respective owners. ZES Confidential
Typographical Conventions
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____________
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User Guide
Warnings call attention to a procedure or
practice that could result in personal injury if not correctly performed. Do not proceed until you fully understand and meet the required conditions.
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CAUTION ____________
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Note
Cautions call attention to an operation procedure or practice that could damage the product if not correctly performed. Do not proceed until understanding and meeting these required conditions.
Notes provide information that can be helpful in understanding the operation of the product.
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WherePort III User Guide D948 Rev C
©2010 Zebra Enterprise Solutions. WherePort and all product names and numbers are Zebra Enterprise Solutions trademarks. All other trademarks are the property of their respective owners. ZES Confidential
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User Guide
Document Revision History
Revision Change Description
A Release per ECO C01013 2/23/06 G.Phillips B Updated per ECO C02336 12/07/10 D. Bowman
Date Initials
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WherePort III User Guide D948 Rev C
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User Guide
Contents
WherePort III User Guide .................................................................................... 1
1 Regulatory Information ............................................................................... 6
1.1 FCC and IC Requirements ........................................................................ 6
1.2 EU Compliance Information (WPT-3200) ................................................. 6
1.3 Regulatory - Other ..................................................................................... 7
CMIIT ID: 2007DJ4325The WherePort ............................................................... 7
The WherePort .................................................................................................... 8
1.4 This Guide ................................................................................................. 9
1.5 The WherePort........................................................................................... 9
1.6 Health Tag ................................................................................................ 10
1.7 WherePort Mounting ............................................................................... 10
2 The WhereTag ............................................................................................ 12
2.1 WhereTag Responses ............................................................................. 12
2.2 Using the WherePort ID .......................................................................... 15
3 Magnetic Communication Basics ............................................................. 16
3.1 Magnetic Fields ....................................................................................... 16
3.2 Coverage Areas ....................................................................................... 18
3.3 Power Level ............................................................................................. 20
3.4 Phases ..................................................................................................... 22
3.5 Sequencing .............................................................................................. 23
3.6 Dual WherePorts ..................................................................................... 24
3.7 Interference ............................................................................................. 25
3.8 The Field Meter ........................................................................................ 26
3.9 The WherePort LED ................................................................................ 26
3.10 Capture Area Simulator ....................................................................... 27
4 WherePort in the Field ............................................................................... 27
4.1 Zones ....................................................................................................... 28
4.2 Area Coverage ......................................................................................... 28
4.3 Portals ...................................................................................................... 28
4.4 Multi-Floor Installations .......................................................................... 31
4.5 Locked WherePorts ................................................................................ 31
4.6 Multiple WherePorts ............................................................................... 32
4.7 Sequenced WherePorts .......................................................................... 35
4.8 Summary .................................................................................................. 36
5 Working through an Application .............................................................. 38
5.1 Warehouse and Shipping Facility .......................................................... 38
5.2 Positioning the WherePorts ................................................................... 40
6 Using the Simulator ................................................................................... 42
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User Guide
6.1 Simulator Controls and Features ........................................................... 42
6.2 WherePort Configuration ....................................................................... 43
6.3 Sample Graphs ........................................................................................ 46
6.4 Adjacent WherePorts .............................................................................. 49
7 Command Summary .................................................................................. 50
7.1 Initial Power Up ....................................................................................... 50
7.2 Passwords ............................................................................................... 50
7.3 Command Execution .............................................................................. 51
7.4 Tag Responses to Commands ............................................................... 51
7.5 Commands .............................................................................................. 52
7.5.1 Message Length .......................................................................................... 52
7.5.2 Power .......................................................................................................... 52
7.5.3 Phase ........................................................................................................... 52
7.5.4 WherePort ID .............................................................................................. 53
7.5.5 Tag Id .......................................................................................................... 53
7.5.6 Response ..................................................................................................... 53
7.5.7 Count ........................................................................................................... 54
7.5.8 Interval ........................................................................................................ 54
7.5.9 Trigger......................................................................................................... 54
7.5.10Data ............................................................................................................. 54
7.5.11EXE ............................................................................................................. 55
7.5.12Sequence Mode ........................................................................................... 55
7.5.13Sequence Mode Message Number .............................................................. 55
7.5.14Version ........................................................................................................ 56
7.5.15XPW ............................................................................................................ 56
7.5.16HWT (1) ...................................................................................................... 56
7.5.17Loader ......................................................................................................... 56
7.5.18GQ ............................................................................................................... 56
8 Installation .................................................................................................. 60
8.1 WherePort Parts ...................................................................................... 60
8.2 Also Required (not included) ................................................................. 61
8.3 Installation Procedure ............................................................................ 62
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WherePort III User Guide D948 Rev C
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User Guide
1 REGULATORY INFORMATION
1.1 FCC and IC Requirements
This device complies with Part 15 rules. Operation is subject to the following two conditions:
1. This device may not cause harmful interference, and
2. This device must accept any interference received, including interference that may cause undesired operation. The user is cautioned that any changes or modifications not expressly approved by Zebra Enterprise Solutions could void the user’s authority to operate the equipment.
See the FCC registration label, located on the bottom of the equipment for the FCC registration and identity.
Canadian DOC Compliance Statement
ThisdevicecomplieswithIndustryCanadalicence‐exemptRSSstandard(s). Operationissubject to thefollowingtwoconditions: (1) thisdevicemaynot causeinterference,and (2) this device mustacceptanyinterference,including interferencethatmaycauseundesiredoperationofthedevice.

LeprésentappareilestconformeauxCNRd'IndustrieCanadaapplicablesaux appareilsradioexemptsdelicence.L'exploitationestautoriséeauxdeux conditionssuivantes:(1)l'appareilnedoitpasproduiredebrouillage,et(2) l'utilisateurdel'appareildoitacceptertoutbrouillageradioélectriquesubi, mêmesilebrouillageestsusceptibled'encompromettre
lefonctionnement.
1.2 EU Compliance Information (WPT-3200)
Table 1EU Compliance - Approved for use in the following countries
AT BE BG CY CZ DK EE FI FR DE GR HU IE IT LV LT LU MT NL PL PT RO SK SI ES SE GB IS LI NO CH
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1.3 Regulatory - Other
CMIIT ID: 2007DJ4325
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THE WHEREPORT
The WherePort III is a location indicator that is part of the Zebra Enterprise Solutions (ZES) Real Time Locating System (Figure 1). The WherePort transmits a localized magnetic field. Since the field is confined (programmable from approximately 3 feet to 25 feet) it is a reliable indicator of the location of key sites in the facility. When WhereTags pass through the WherePort field they transmit the ID of the WherePort. The WhereTag response can be programmed to indicate needed information about the status of the asset or object to which the tag is attached.
WherePorts 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 ID that pinged it and any other programmed status information.
Status LED
Figure 1 WherePort
The VSS system is programmed with the location of each WherePort and their ID. When a WhereTag transmits a message that includes the ID of the WherePort 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.
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1.4 This Guide
This guide presents the basic principles of WherePort 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 WherePorts.
It describes the WherePort, the WhereTag and its responses, the characteristics of the magnetic field, and how the WherePort 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 site placement and configuration.
1.5 The WherePort
The WherePort is a round, dome shaped device, (9 inches in diameter and 5.25 inches high). It is powered by either 24 VAC or 36 VDC. A mobile version is available that uses only DC power (12-36 VDC; 1.5A). The complete specifications are shown in Table
2. The wiring schematic is shown in Figure 2.
The WherePort is configured using commands sent through the RS-232 interface. These commands are described in Appendix B.
Table 2 WherePort Specifications
Size 9.0 x 5.25 in. (229 x 133 mm) Weight 2.3 lbs (1.0 Kg) Voltage 24 VAC or 36 VDC Voltage (standard)
12-36VDC (AC Voltage is not allowed) (mobile) Current 250 mAmp max (standard) 1.67A Max. (mobile) PwrDiss 4.2 Watts (max) Operating Temperature -40 to +55 ºC Storage Temperature -40 to +70 ºC Humidity 0 to 100% Non-condensing AC/DC Power
Connection
Phase Synchronization 2 wires from previous WherePort (green/orange)
Configuration Interface
2 wires (black and white)
For mobile versions, positive input is connected to white
wire and negative input is connected to black wire.
2 wires to following WherePort (red/blue)
12 pin round, weather tight connector (provided by Zebra
Enterprise Solutions) with custom cable (com port)
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Power Black & White
24 VAC Transformer
Figure 2 Wiring Schematic for Power and Synchronization
Unused: Do Not Terminate
Output Sync: Red and Blue
Each 24 VAC transformer supports no more than two WherePorts.
24 VAC Transformer
Input Sync: Green and Orange
1.6 Health Tag
A WhereTag that is programmed to blink when there is no signal from the WherePort may be mounted to each WherePort. This optional tag is called a health tag because a signal from this tag indicates that there is something wrong with the WherePort that has caused it to stop signaling.
1.7 WherePort Mounting
The WherePort is mounted using a bracket (Figure 3). It can be mounted from the back,
the top, or the bottom. For details on installing the WherePort see the Installation Instructions. A ruggedized mounting bracket is also available (Figure 4).
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Mounting Bracket
Figure 3 WherePort Mounting Bracket
Figure 4 Ruggedized Mounting Bracket
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2 THE WHERETAG
The WhereTag (Figure 5) is pinged by the WherePort 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, the blink is received by at least three sensors which enable the system to locate the tag accurately on the site.
The WherePort signal is received by a pick up coil in the WhereTag. In the WhereTag III the coil is oriented along the length of the tag. In WhereTag II it is rotated 30º away from the length of the tag.
Coil Orientation
Figure 5 The WhereTag III and WhereTag III ST
The solid line shows the orientation of the pick up coil for both WhereTags.
2.1 WhereTag Responses
The tag can be programmed to respond in a variety ways when it detects a WherePort signal. There are three defined modes (see Figure 6).
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.
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Figure 6 The WhereTag in a WherePort Capture Area
In mode 1, the re-trigger is set for a time interval after the WherePort blink. When this interval elapses, the tag will transmit a blink if the tag is still in the same WherePort field. Without the re-trigger interval being set, the tag will continue blinking in response to the WherePort signal.
If the tag enters a new field, it will transmit a blink, even if the set interval has not elapsed (see Figure 2).
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Figure 7 Retrigger Mode 1 and a New Capture Area
In mode 2 the tag must both leave the WherePort field and the specified interval elapse before a WherePort blink will occur. If the tag enters a new WherePort field it will immediately transmit a blink (Figure 2).
Figure 8 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 9 Retrigger Mode 3 and a New Capture Area
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2.2 Using the WherePort ID
The tag response can also be changed by the WherePort. 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
3.
WherePorts 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. WherePorts positioned at entry and exit gates can turn the tags on when the trailers enter the yard, and off when they leave.
Table 3 WherePort IDs
ID Range Tag Response
Standard WP Response
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
Added Function
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3 MAGNETIC COMMUNICATION BASICS
The WherePort 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 an excellent device for monitoring tagged assets
3.1 Magnetic Fields
The magnetic field of the WherePort extends nearly equally in all directions creating an elliptical field (Figure 10). The field has a direction that is determined by the position of the coil that creates it.
Field Lines
WherePort Coil
Figure 10 WherePort Field
The field extends in all directions around the WherePort. 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’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 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 signal decreases (Figure 11).
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Parallel Coils
Perpendicular Coils
Figure 11 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 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 12). The guaranteed capture area is different for each orientation of the tag and the power level of the WherePort.
Guaranteed Capture Area
Tag Orientation 2
Uncertainty Area
Figure 12 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. The lightly shaded area is the uncertainty area.
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3.2 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.
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 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 field will typically change its orientation with respect to the WherePort. As the orientation changes the effective range of the WherePort will change.
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Figure 13 Orientation and Capture Area
Two maps are shown for two different WherePort mountings, horizontal (left) and vertical (right). The two maps show two different tag orientations for each of the mountings.
Figure 13 shows the effects of WherePort and Tag orientation on the guaranteed capture
area. These maps are taken from the Simulation software.
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3.3 Power Level
The size of the field is determined by the power setting for the WherePort. There are nine power levels for the WherePort III. Setting the power level to 0 turns off the WherePort magnetic field. Table 4 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.
Table 4 Power Levels, Random and Optimum Fixed Tag Orientations
Power Level Capture Range Release Range
Random Optimum
Fixed
0 Off Off Off Off 1 1.0 2.5 4.0 4.0 2 2.o 3.8 6.0 6.0 3 3.0 6 9.0 9.0 4 4.0 8 12.0 12.0 5 6.0 11 17.0 17.0 6 8.0 14 21.0 21.0 7 10.0 19 30.0 30.0 8 12.0 25 37.5 37.5
Random Optimum
Fixed
Random orientation means that the tag may take any of the possible positions relative to the WherePort. 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. 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.
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Field Overlap
Figure 14 Overlapping Uncertainty Areas
Coverage Overlaps
When positioning WherePorts it is not always possible to prevent their fields from overlapping. Overlapping the uncertainty areas of two WherePorts does not produce a guaranteed capture area. It produces an area where a tag may be pinged by either one or the other WherePorts or none.
When the fields of two WherePorts must be overlapped to cover a large area (Figure 14) it is necessary to set the phases of the two WherePorts. Both WherePorts (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 for the field it is in.
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3.4 Phases
When two are more WherePorts are used to cover a large area they must be phased to reduce the interference between the two fields. WherePorts mounted on the ceiling might be set to 0º and on a wall 90º. Figure 15 shows the correct phase settings for four orientations of the WherePort. The phases are set with reference to the orientation of the master WherePort.
A WherePort set to 0º phase is defined as the master and all the other WherePorts are then connected to it using the phase wire connections. Phased WherePorts must all have the same ID.
90º
0º Master
180 º
270 º
Figure 15 Phase and WherePort Orientation
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3.5 Sequencing
WherePorts that have been connected electronically can also operate in the sequence mode. Sequenced WherePorts do not transmit at the same time. The first WherePort sends its message and then shuts off its field while the next WherePort in the sequence sends its message. The number of times each WherePort sends its message is set using the CMCn command. The number of WherePorts in the chain is set using the CMWn command. See Figure 16 through Figure 18.
The master WherePort LED in a group of sequenced WherePorts is green when active. The slave WherePort LEDs are yellow when they are active. The LEDs are all off when the WherePorts are not active.
Inactive
Master WP #1
Active
Slave WP #2
Slave WP #3
Figure 16 Mode 1
One WherePort is active at a time. A master and two slaves are shown. WhereWand WPSeq Count (or RS232 CMWn) = 2.
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Master WP #1
Slave WP #2
Slave WP #3
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Slave WP #4
Figure 17 Mode 2
Master WP #1
Slave WP #2
Figure 18 Mode 3
More than one WherePort 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.
All WherePorts 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, WherePorts 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.
3.6 Dual WherePorts
The dual WherePort is a bracket with two WherePorts mounted to it, oriented 90º from each other (Figure 19). They ensure a guaranteed capture range and eliminate the need for multiple mounting sites. Typically the dual WherePort 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 (see Figure 20). Dual WherePorts are always phased with one set as the master at 0º and the other at 90º.
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Figure 19 Dual Where Port
A
B
C
Figure 20 Coverage Pattern
A single (A), adjacent (B), and dual WherePort (C) field are shown. The fields shown are for WherePorts at power level 8 and mounted at the same height as the WhereTag.
3.7 Interference
Steel objects and some devices can interfere with the WherePort field and change its shape and range.
Some kinds of structures will affect the range of the WherePort. Mounting the WherePort on the broad face of a steel I-beam reduces the coverage on the front and back of the WherePort.
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 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 and the tag. The most common sources of magnetic interference are CRT monitors, electric motors, vehicle RFID anti-theft ignition systems, and other WherePorts. A WherePort 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.
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Figure 21 Magnetic Field Meter
3.8 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 field (Figure 21). By walking around an installed WherePort 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.
After the installation of WherePorts 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).
3.9 The WherePort LED
On the top of the WherePort is an LED that indicates the status of the WherePort (see
Table 5).
Table 5 LED Status Indicator
Condition WherePorts LED Status
Power up reset All Red Power = 0 All Red Phased Master Green Phased Slave Yellow Sequenced Master, field on Green
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Sequenced Master, field off No color Sequenced Slave, field on Yello Sequenced Slave, field off No color
3.10 Capture Area Simulator
The capture area simulator calculates and maps the capture area for several different WherePort and WhereTag orientations. The simulator is described in Chapter 6.
4 WHEREPORT IN THE FIELD
The basic principles of the WherePort must be translated into applications in the field. Doors, corridors, rooms, parking lots do not necessarily conform to the requirements of the WherePort field. In this chapter several common situations are discussed in order to illustrate how the characteristics of the WherePort affect their positioning on a site.
Uncertainty Coverage
WherePort
Guaranteed Coverage
Figure 22 WherePort Coverage
In the applications that follow the WherePort field will be illustrated as shown in Figure
22. 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.
In the examples that follow, the WherePort field is described. It must be remembered that the capture area is what is important. The field is shown to simplify the presentation.
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A
4.1 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 WherePorts in a zone, the system can reliably determine that a tag asset has entered and is still in a zone.
4.2 Area Coverage
There may, however, be many areas where different activities occur that must be monitored. Well positioned WherePorts 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 WherePorts 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 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 WherePorts.
• 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 WherePorts be close enough to each other that their fields may
overlap?
4.3 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. WherePorts 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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Corridor
Functional Area
Figure 23 WherePort in a Doorway
To enter the room, an object must pass through the guaranteed capture range of the WherePort.
The placement of a WherePort in the doorway might seem simple. Figure 23 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. If the WherePort 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 field might extend far enough into the second floor to ping a WhereTag moving through a completely separate part of the facility.
The WherePort 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 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, tagged assets may enter or leave through the uncovered path.
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Figure 24 Loading Dock Doors
Spacing of loading dock doors makes it impossible to assign unique WherePort 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 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 24).
Some of these issues might be solved by sequencing the WherePorts, which will be covered later in this chapter.
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Figure 25 Multi-Floor Schematic
Shows a floor configuration so that the WherePort field extends into the second floor.
Drop Ceiling
Floor 2
Utility Space
Drop Ceiling
Floor 1
4.4 Multi-Floor Installations
When activities are tracked on several floors, the vertical position of the WherePort 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 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 is mounted at a height that prevents tags on the floor above from being activated (Figure 25).
The WherePort 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.
4.5 Locked WherePorts
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 signals. Where room coverage is needed the RTLS algorithm could indicate that a tag is outside a room when it is not.
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WherePorts are defined as locked using the software of the SystemBuilder. No setting in the WherePort is needed. After a tag pings that it has detected a locked WherePort the tag will be ignored until it is unlocked. It is unlocked by detecting an unlocked WherePort.
Tag movement must be clearly understood to make sure that a tag that enters a locked WherePort field will also enter an unlocked WherePort field. If a tag is inadvertently locked by a WherePort it will be ignored by the system until it enters the field of an unlocked WherePort.
Typically locked WherePorts 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 and from then on be tracked normally.
4.6 Multiple WherePorts
Some locations require more than one WherePort to insure adequate coverage. Examples include a large parking lot, a long corridor, a large number of loading dock doors, or a large doorway.
If a space is large enough, separate WherePorts 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. In this case the possible mounting options must be considered.
The placement of WherePorts with overlapping coverage requires attention to a number of issues. The first is phasing. Whenever the coverage fields of two or more WherePorts overlap, the phases of the WherePorts must be set. When WherePorts are phased, one is always designated as the master with its phase set to 0 (see Figure 26) and all phased WherePorts must be set to the same ID.
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180 º
Figure 26 Phasing for Wall Mounted WherePorts
Viewed from the top.
0º Master
Figure 26 shows a corridor or large space with WherePorts mounted on the different
walls to effectively cover the entire area. This means that the phase of each WherePort must be set as indicated.
90 º
0º Master
180 º
Figure 27 Phasing for Ceiling and Wall WherePorts
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A large doorway may require three WherePorts to reliably detect the passage of a tagged asset through it. In the example shown in Figure 27 coverage requires a WherePort on each side of the doorway and on the ceiling. Again each WherePort must be phased accordingly.
0 º
0 º
180 º
Figure 28 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. If unique identification of passage through a given door is required, a more complex solution will be required.
Figure 28 and Figure 29 show two ways of solving the problem. The example in
Figure 28 uses a WherePort to cover two doors. Since these WherePorts are mounted in
different orientation on the walls, their phases must be set as well. Figure 29 shows a WherePort 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 WherePorts. If the tag orientation is horizontal, then the top solution is best so that the WherePort field will be maximized. If the tags are oriented vertically, then the lower solution, with the WherePorts mounted over the doors, will be best.
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Figure 29 Over the Door WherePort Mounting
The dotted line ellipse shows the approximate shape of the coverage area if the tag is oriented horizontally rather than vertically.
1
2
3
4
Figure 30 Sequenced WherePorts on Parking Lanes
4.7 Sequenced WherePorts
Figure 30 shows the use of sequenced WherePorts to accurately identify which lane a
vehicle has entered. Sequenced WherePorts are turned on and off. WherePorts 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.
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4.8 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.
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5 WORKING THROUGH AN APPLICA TION
To effectively place WherePorts 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 placement will be discussed and mounting locations for WherePorts found.
Figure 31 The Warehouse Site
5.1 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
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Issues affecting the placement of the WherePort.
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 field?
The first and most important step in creating a successful WherePort application is to define what information must be obtained from the WherePort. Is the passage of an asset past a particular point important?
How does the use of WherePorts 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 at this location.
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Figure 32 WherePorts Mounted on the Site
5.2 Positioning the WherePorts
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 is one of the most important determinants of the coverage field.
What kinds of interference are on the site?
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identifying where on the site this information must be gathered, and determining Creating a map of the site.
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6 USING THE SIMULATOR
The WherePort simulator (ZES p/n D0910) is a tool for exploring the best solutions for WherePort placement and for better understanding the basic characteristics of WherePort communication.
Because of the number of variables that affect the response of the tag to the WherePort field, it is helpful to examine the response using the simulator. The number and placement of WherePorts, the orientation of the tag while it is in the field, and the distance of the WherePort from the tag all interact to determine this response.
6.1 Simulator Controls and Features
Figure 33 Starting the WherePort Simulator
Figure 33 shows the starting screen of the simulator. There are seven options for
WherePort placement:
Single WherePort Mounted vertically Single WherePort Mounted horizontally Dual WherePort Mounted horizontally Dual WherePort Mounted Vertically
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Two Adjacent WherePorts Mounted vertically, facing sideways Two Adjacent WherePorts Mounted vertically, facing forward Two Adjacent WherePorts Mounted horizontally
The magnetic field extends in all directions from the WherePort. 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.
Figure 34 Configuration Screen
6.2 WherePort Configuration
The WherePort position to be simulated is configured on the WherePort configuration screen (Figure 34). There are two parameters that must be set:
Power Level Select a power lever from 1 to 8. The highest power
Tag to WherePort Height (feet) The relationship between the height of the
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WherePort position and the WhereTag position (0 to 20 feet).
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Figure 35 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 position, graphs are drawn for six different WhereTag orientations. These orientations and the number designations of each are shown in Figure 35 The tag orientation is with reference to the position of the WherePort.
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 36.
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Figure 36 Sample Graph
The graph shows the guaranteed capture area in green and the uncertainty area in yellow for a single WherePort, mounted horizontally, with a power level of 4, and a tag to WherePort height of 4 feet for a tag with orientation 2. The scale is 10.
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Figure 37 Sample Graph
Shows the same configuration as Figure 4 except the tag is in the 6 orientation.
6.3 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 36, with orientation 2, shows a guaranteed capture area that is approximately ten feet long and four feet wide. Figure 37, 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 38 and Figure 39 use the same settings as Figure 36 and Figure 37 except the power setting is 8 instead of 4.
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Figure 38 Power Level Comparison Tag Orientation 2
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Figure 39 Power Level Comparison Tag Orientation 6
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Figure 40 Adjacent WherePort Configuration
6.4 Adjacent WherePorts
Adjacent WherePorts require that some additional variables be set:
Power Level Select a power lever from 1 to 8. The highest power
level is 8.
Tag to WherePort Height Set from 0 to 20 feet. Distance between WherePorts (feet) 0 to 50 feet in five foot increments. Are the WherePorts Synchronized Yes or no (wired together). WherePort #1 Phase 0, 90, 180, or 270. WherePort #2 Phase 0, 90, 180, or 270.
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7 COMMAND SUMMARY
This section describes the commands used to configure the WherePort.
All commands and responses are ASCII character strings.
ACK responses are the three character string ‘ACK’ and not the 0x06 non­printable 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.
7.1 Initial Power Up
When theWherePort is initially powered up, it will transmit the following string.
{CR}{LF} WhereNet{CR}{LF} WherePort vx.xx <CR><LF> (where x.xx is the firmware version)
7.2 Passwords
Every command must start with a four character password followed by a colon. For example, if the passwore is 1234 the query command would be entered as follows:
1234:VER?<CR><LF>
The WherePort will respond with NAK to any command that does not start with the correct password.
The WherePort 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 HWT 5 HWT 6
Set flag 2 of 3 only if flag 1 is set and 2 and 3 are clear. Set flag 3 of 3 only if flags 1 and 2 are set and 3 is clear.
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 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 is powered down.
7.3 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 will not be operating under these values until the execute command is sent.
7.4 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 blink. The command
will be responded to when the tag completes the WherePort 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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7.5 Commands
7.5.1 Message Length
Set the length, in bits, of the WherePort message. There are six possible values.
n Value 1 2 3 4 5 6
Example
MSG 1<cr>
10 bit 28 bit 44 bit 144 bit 144 bit with payload CRC1 144 bit with payload CRC2
Sets the message length to 10 bits.
Considerations
Message length affects the dwell time when using sequenced WherePorts.
7.5.2 Power
Set power level, from 0 to 8. When set to 0 the WherePort power is off.
PWR n<cr>
Increasing the power level increases the range.
Example
PWR 8<cr>
Sets the power level to 8.
Considerations
Lower power levels are used to make sure the capture area of the WherePort is restricted to the zone or area to be monitored.
7.5.3 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.
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Example
PHS 2<cr>
Sets the phase to 2.
Considerations
When WherePort fields overlap, the phase of each WherePort must be set to match to placement of the ports.
7.5.4 WherePort ID
Sets the WherePort Id. The valid range is 0 to 32,767.
WID n<cr>
Example
WID 4<cr>
Sets the WID to 4.
Considerations
WherePort IDs 0 through 255 are used for an alternate blink mode. When a WhereTag is pinged by a WherePort 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 Zebra Enterprise Solutions technical staff.
7.5.5 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.
7.5.6 Response
Sets the tag WherePort response blink type (applies only to 27 bit and 44 bit messages)
RSP n<cr>
1 72 bit 2 144 bit
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Example
RSP 1<cr>
Set the response blink type to 72 bits.
7.5.7 Count
Set the WherePort response blink count (44 bit message only).
CNT n<cr>
Valid range for n is 0 through 15.
Example
CNT 4<cr>
Sets the blink count to 4.
7.5.8 Interval
Set the WherePort response blink interval (44 bit message only ) where n is 0 to 7.
INT n<cr>
7.5.9 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 .
7.5.10 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>
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A string of 24 ASCII-HEX characters to set the 96-bit data payload of the WherePort.
7.5.11 EXE
EXE n<cr>
Send message to magnetic field generator and the flash memory.
7.5.12 Sequence Mode
Set number of WherePort 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 WherePorts in the chain to 3, one master and 2 slaves.
7.5.13 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 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
1 2 3 4 5
6
0.2 0.5 1.0 2.0 3.0 4.0 5.0 10 15 20
25 64 128 255 12 30 60 120 181 255
8 20 41 82 123 164 205 3 7 14 27 41 55 68 137 205 255 3 7 14 27 41 55 68 137 205 255
3 7 14 27 41 55 68 137 205 255
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7.5.14 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 software version number to 2.01.
7.5.15 XPW
Set the password to the four character ssss.
XPW ssss<cr>
7.5.16 HWT (1)
Used to test the ISP port pins and set the WherePort 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>
7.5.17 Loader
LDR n/a WherePort Loader vm.nn
Enter loader mode to allow firmware update. Will time out after 80 seconds if there
is no transfer. Transfer format is xmodem 128 byte.
7.5.18 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 when the mode is changed by the system in response to a particular tag.
GQ1
Set message length = 10 bit
Execute immediately
GQ1 n
Set WPID = n, where 0 ≤ n ≤ 7
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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
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GQ4 s
Set message length = 144 bit (CRC)
Set data string = s (22 or 24 chars)
String is in ASCII-Hex format
Execute immediately
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)
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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
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8 INSTALLATION
The lists of required parts, both supplied with the WherePort (Figure 41) and required but not supplied, and the instructions for mounting WherePorts in typical locations follow.
Caution - Use of Zebra external power supply is limited to indoor use
and a max 40° C environment. Outdoor installations will require installation of a limited power source by the installer.
Warning - Electrical Shock: No operator serviceable parts inside.
Refer servicing to qualified personnel. To prevent electrical shock, do not remove covers.
Caution - The WherePort III must be installed by a qualified service
technician.
Caution – Sync cable use is limited to indoor to indoor installation or
outdoor to outdoor installation. Sync cables must not be installed between indoor and outdoor installations.
8.1 WherePort Parts
1. 1/4 x ½ in (12mm) screw (2)
2. Lock washer 2)
3. Flat washer (2)
4. Rubber bushing (2)
5. Bracket (1)
6. WherePort (1)
7. Tag Bracket (1)
8. Power/Sync Cable (1)
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Lock Washer (2x)
½ inch Screw (2x)
User Guide
WherePort
Flat Washer (2x)
Tag Bracket
Bracket
Figure 41 Installation Kit
The power/synchronization cable is not shown.
8.2 Also Required (not included)
1. Power supply, North American PS-025-00
2. Power supply, International PS-030-00
3. Power supply, vehicle 12 V, PS-200-00
4. Interconnect cabling Belden p/n 9156
5. WhereWand Programmer WND-2010 or WND-2200
6. Cable Assembly, WhereWand I to WherePort III CBL-300-00
7. Cable Assembly, WhereWand II to WherePort III CBL-320-00
Rubber Bushing (2x)
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For Angled Mount
Break Off Tab for Rear Mount
Figure 42 Mounting Bracket
User Guide
For Side Mount
For Rear Mount
Hole for Wall Mount
Slots for Pole Mount
8.3 Installation Procedure
Step 1 Determine mounting location based on Zebra Enterprise Solutions site design
worksheet.
Step 2 Determine orientation of WherePort compared to mounting surface.
Choose bracket hole depending on pole mount, side mount, or rear mount. Break bracket tab for rear mount (Figure 42). Mount bracket to wall using # 8 (4 mm) screws (not supplied) or ½ in (12 mm) straps for pole mount.
Step 3 Mount WherePort to bracket using supplied hardware.
WherePort III User Guide
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ll other trademarks are the property of their respective owners.
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Power Black & White
24 VAC Transformer
Figure 43 Wiring Schematic for Synchronized WherePorts
User Guide
24 VAC
Unused, Do not Terminate
Transformer
Output Sync Red & Black
Since there are more the two WherePorts there are two 24 volt AC power supplies.
Input Sync. Green & Black
Step 4 Connect wiring: white & black pair to power; red & blue pair to following
WherePort; green & orange pair to previous WherePort (Figure 43).
Note: Do not connect more than two WherePorts to an AC transformer.
Step 5 Use WhereWand and programming cable assembly to set the ID, power, and
phase per the site design worksheet and WhereWand User Guide D0071. If desired, the WherePort can be programmed prior to installation.
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ll other trademarks are the property of their respective owners.
User Guide
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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
signal.
dual WherePort Two WherePorts on a bracket, oriented at 90 degrees to each other. guaranteed WP capture area The part of the WherePort field where a tag will be
pinged.
WP health tag A WhereTag mounted to a WherePort to indicate if the WherePort
is operating correctly.
WP field The magnetic field produced by the WherePort. 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. A locked tag is invisible to
the RTLS system. Must be paired with a WherePort that unlocks the tag.
master In a group of phased WherePorts, 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 affects the range of the WherePort.
phase WherePort setting required when uncertainty areas of coverage
overlap between two or more WherePorts. The possible phase settings are 0, 90, 180, and 270.
ping What a WherePort does to a WhereTag when the tag is in the field. sequence WherePorts linked together which transmit at intervals set by the
master WherePort in the sequence.
WherePort III User Guide D948 Rev B
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ll other trademarks are the property of their respective owners.
User Guide
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simulator A software package for experimenting with coverage areas. slave All WherePorts other than the maser in a group of sequenced or
phased WherePorts.
uncertainty area The part of the WherePort field where a tag may be pinged but
where it is also possible that it will not be pinged.
WherePort ID A number from 0 to 32,000 that identifies each WherePort to the
system.
WherePort III User Guide D948 Rev B
©2010 Zebra Enterprise Solutions. WherePort and all product names and numbers are Zebra Enterprise Solutions trademarks.
ll other trademarks are the property of their respective owners.
A
B
Index
alternate blink mode, 11 dual WherePort, 18 field meter, 20
guaranteed capture, 14 guaranteed release, 14
health tag, 6 interference, 19
LED, 20
magnetic field, 12
modes, 8
mounting bracket, 6 overlapping fields, 16
phase, 17
phased
master, 27 power level, 15 sequenced, 29
simulator, 21
specifications, 5 uncertainty, 14 WherePort ID, 4 WhereTag coil orientation, 8 WhereTag response modes, 8
WherePort III User Guide
©2010 Zebra Enterprise Solutions. WherePort and all product names and numbers are Zebra Enterprise Solutions trademarks.
ll other trademarks are the property of their respective owners.
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