Viconics VWG-50 (Classic ZigBee) Design Consideration and Setup Guide - Manual (Page 11)

11 | VWG-50-Setup Guide
5H stands for 5 hops maximum recommended.
5H is for a simple process when laying out the architecture of the network. ANY given
device / node / controller should be “optimized” to be NO FURTHER IF POSSIBLE than
5 Hops to & from the VWG / Coordinator. This is due to the nature of the Viconics
Zigbee™ stack in the wireless controllers. To properly layout the potential architecture and
determine the number of VWG’s required on the job site, you first need to establish the
maximum possible coverage of a single VWG with a wireless communication card with a 5
hop maximum. This is also done with the survey tools & is covered in detail in the manual
for the survey procedures and tool usage: MAN VWG-SURVEY-Exx.
Best practice Zigbee™ initial network start-up procedure
In order to avoid creating orphan devices / nodes/ controllers and moving about devices /
nodes / controllers during the initial network start-up, it is recommended that you use the
same power up sequence for devices as you originally did during the survey. Again,
please note that once a device / node / controller has been assigned a Zigbee™ address
and has joined the active Zigbee™ network, it will save its assigned Zigbee™ address to
flash memory & re-use it afterwards even after a power failure or a network re-start. The
ONLY time a 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 flash to be erased and will force the /
node / controller to try to re-join a new network. I.E. this is ONLY applicable during the
initial network start-up.