Viconics VST5000 (Classic ZigBee) User Guide Manual do Utilizador descarregar pdf (Página 8)

VST5000W5000W Wireless Survey Tools User Guide

Orphan Nodes

It is important to understand that if a network is started

upincorrectlyit“may”resultinorphanedorunassigned

devices/nodes/controllersthatwillNOTjointheZigBee

network. Let’s rst understand how an orphan node is

created.Atypicalexampleiswhenjobsarestartedon

atechniciandeskbeforesendingthedevices/nodes

/controllerstotheeldforinstallation.Oftenthe

integration technician will begin by powering up the

Jace – coordinator and connect it to the Workbench tool

creating and adding the Wireless Tstat Network driver

layer.

Once the Wireless Tstat Network driver layer is up and

running, the technician will then open and start up the

wirelessdevices/nodes/controllersonebyoneandadd

them to their Niagara database.

• Theywillpowertherstunit,thenaddittothe

database and nally power it down.

• Theywillpowerupthesecondunit,addittothe

database and then power it down.

• Thiswillberepeatedtoamaximumof6devices.

This will work ne for the rst 6 devices only, simply

becausetheJace–coordinatorcanprovideamaximum

of 6 assignable addresses. When the technician powers

upthe7thdevice/node/controller,itwillNOTbeable

to join the ZigBee network unless one of the previous

device/node/controllerispoweredbackon.Oncethis

isdone,itwillbeabletoassignthenext6addressesas

usual.

In order to add another 6 devices, one of the previously

added device needs to be left on. If 42 devices are to

be added to the network, 8 of them should ALWAYS be

powered and be within connectivity range of all the

others.

Howwouldorphannodesappearintheeldandhow

would you allow them to join the ZigBee network ?

Knowing and understanding

the 6A / 5H rule of ZigBee

ZigBee is a standard which is suitable for wireless sensor

andcontrollernetworks.InZigBee,adevice/node

/controllerissaidtojoinanetworkifitcanobtaina

ZigBee network address from a parent device. This

ZigBeeaddressisavaluewhichisNOTinitiallyexposed

or available for the integrator to see.

Devices/nodes/controllerscancalculateandassign

addresses for their surrounding devices by a distributed

addressassignmentscheme.Thisassignmentisexible,

but it does somewhat restricts the number of attached

devices and the possible depth of the said network for

any given device on the network.

ZigBee supports three kinds of networks type: star, tree,

and mesh networks. The ZigBee coordinator ( In our case,

this is the Jace with the wireless communication card ) is

responsibleforinitializing,maintaining,andcontrolling

the network.

• Astarnetworkhasacoordinatorwithdevices

directly connecting to the coordinator.

• Atreeandmeshnetworks,devicescancommunicate

with each other in a multi-hop fashion.

The network is formed by one ZigBee coordinator and

multiple ZigBee routers. A device can join a network as

an end device by the associating with the coordinator or

a router.

AZigBeedevice/node/controllerissaidtohave

successfully joined a network if it can obtain a ZigBee

network address from the main Jace coordinator or any

otherrouterdevices/nodes/controller.

6A stands for 6 addresses maximum

per device / node / controller

Anygivendevice/node/controllerincludingthe

Jace–coordinatorcanONLYgiveamaximum6ZigBee

addresses out to other devices so they join the active

ZigBeenetwork.Thismeansforanydevice/node

/controllertobeabletosuccessfullyjoinaZigBee

network, it needs an address to be assigned by another

device/node/controllerwhichiswithinconnectivity

andthathasNOTalreadyassigneditsmaximumof6

addresses allowed.

Pleasenotethatonceadevice/node/controllerhas

been assigned a ZigBee address & has joined the active

ZigBee network, it will save its assigned ZigBee address

to ash memory & re-use it afterwards even after a power

failureoranetworkre-start.TheONLYtimedevice/node

/controllerwouldrequireaNEWZigBeeaddressisifthe

network is re-started with either a new PAN ID or a new

Channel value. This causes the currently assigned & saved

ZigBeeaddressinashtobeerased&willforcethe/

node/controllertotrytore-joinanewnetwork.

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