User's Manual

54
ASSA ABLOY Hospitality
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9. Redundancy and recovery
9.1 Communication channel
The ZigBee communication protocol has the built in capability to communicate on any
one of 16 different channels (or frequencies). In the event that one or more channels
are blocked or do not allow for adequate signal strength and stability, other channels
may be used. Important: The ZigBee communication can be disturbed by e.g. Wi-Fi
networks; always make sure to have as long distances as is physically possible
between ZigBee devices and other radio equipment. It is also possible to use the Set
all coordinators checkbox in the Select channels dialog; see details below. If Wi-Fi
disturbance still causes problems at a site, automatic channel change can be enabled.
See more information about automatic channel change in section 9.1.1.
If there are circumstances that dictate the devices should communicate on a specific
channel (i.e. if there are other online devices or known interference on other
channels), it is possible to force the devices to stay on a specific channel.
1. Right click on the concerned GW in SysMon's Online Network view and
choose Set channels; a dialog as in Figure 56 will be shown.
Figure 56
2. By default, all 16 channels are checked since the GW will normally choose
which of the 16 channels in the 2.4GHz band the nodes in the PAN should
use. If a specific channel should be used, click Clear to uncheck all channels.
3. Check the desired channel(s); if more than one channel is checked, the best
one will be chosen.
4. If the chosen channel(s) should be used for all GWs in the system, mark the
checkbox Set all coordinators.
5. Click OK.