ZFR1800 Series Wireless Field Bus System Technical Bulletin 73
Appendix B: Upgrading Controller Firmware Using Point
Schedule
At Release 5.0 and above, wireless download behavior has been changed when
upgrading controller firmware.
Within the point schedule (automatic process), a firmware upgrade is initiated by
first simultaneously downloading two controllers within each wireless mesh. After
the first two controllers finish upgrading, the firmware upgrade propagates from
those two controllers to the rest of the mesh automatically. The point schedule, at
this time, is merely polling the devices for download status.
We now suggest doing a Network Reform before performing a firmware upgrade
due to the new firmware upgrade behavior, because the new download scheme
relies on an even distribution of the ZigBee short addresses, which is best achieved
by a Network Reform with all the nodes communicating. This Network Reform
only needs to be done the first time the mesh network’s controllers are upgraded.
The network chooses two of the first depth-level controllers that are closest to the
coordinator. Those controllers are upgraded first, then the siblings at that same
depth level. The point schedule instructs each node in the mesh network when to
begin their download from their parent device. As each parent device finishes
upgrading, the child devices of that device begin their own upgrades, reading the
main code from the parent device.
If you have multiple coordinators (mesh networks) on a trunk, the point schedule
downloads a pair of controllers on each wireless mesh at a time. For example, if
your trunk has three ZFR1810 coordinators with the same model controllers in
each mesh, six downloads occur simultaneously.
IMPORTANT: Even if the point schedule is removed from the network after
initiating an upgrade, the upgrade continues throughout the mesh network until
every controller in the network completes the firmware upgrade.
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