Murata Electronics North America Z2430HPA Manuel D’Utilisation
ZMN2405/ZMN2405HP Dev Kit
© 2007-2008 RFM Inc.
3
M-2405-0000 Rev. C-
2. ZigBee Networking
ZigBee is a mesh networking and security stack that sits on top of an 802.15.4 MAC layer radio.
802.15.4 specifies the frequency bands, the number of channels, the spreading technique and
the modulation method. ZigBee controls how data is routed between 802.15.4 physical layer
radios, adding mesh and encryption capability along the way.
There are three types of devices specified in ZigBee: a Coordinator; a Router and an End
Device. The Coordinator and Router are sometimes referred to as Full Function Devices or
FFDs. The End Device is sometimes referred to as a Reduced Function Device or RFD. Since
an FFD can be a Coordinator or a Router, this manual will use the Coordinator, Router and End
Device names.
The Coordinator is responsible for setting the channel for the network to use, making its
presence known to Routers and End Devices, assigning network addresses to Routers and End
Devices and keeping the routing tables for the network that are necessary to route data from
one ZigBee device to another in the same ZigBee network. Each network must have one and
only one Coordinator. Without a Coordinator, a network cannot form. Typically, although it is not
a requirement, the Coordinator will function as the gateway or takeout point for applications
where data from the ZigBee network will be sent off the network and will be received from
devices off the network.
The Router, as its name implies, is responsible for routing data from other Routers or End
Devices to the Coordinator or to other Routers closer to the Coordinator. The Router can also
be a data input device, either serially or through the I/O pins of the module.
The End Device can only communicate with the Coordinator or a Router. An End Device cannot
communicate directly with another End Device. Communication between one End Device and
another End Device must go through the Coordinator or a Router and may go through one or
more Routers.
Figure 2 depicts a typical ZigBee network with two levels of Routers. The box labeled C
represents the Coordinator, the boxes labeled R represent Routers and the boxes labeled E
represent End Devices. As can be seen from the diagram, each End Device has multiple
potential communication paths. The most likely path is a solid line with backup paths indicated
with dashed lines. From this Figure it is seen how End Devices only communicate with Routers
and the Coordinator while Routers can communicate with End Devices, other Routers or the
Coordinator. The Coordinator can communicate with Routers and End Devices.
802.15.4 specifies the frequency bands, the number of channels, the spreading technique and
the modulation method. ZigBee controls how data is routed between 802.15.4 physical layer
radios, adding mesh and encryption capability along the way.
There are three types of devices specified in ZigBee: a Coordinator; a Router and an End
Device. The Coordinator and Router are sometimes referred to as Full Function Devices or
FFDs. The End Device is sometimes referred to as a Reduced Function Device or RFD. Since
an FFD can be a Coordinator or a Router, this manual will use the Coordinator, Router and End
Device names.
The Coordinator is responsible for setting the channel for the network to use, making its
presence known to Routers and End Devices, assigning network addresses to Routers and End
Devices and keeping the routing tables for the network that are necessary to route data from
one ZigBee device to another in the same ZigBee network. Each network must have one and
only one Coordinator. Without a Coordinator, a network cannot form. Typically, although it is not
a requirement, the Coordinator will function as the gateway or takeout point for applications
where data from the ZigBee network will be sent off the network and will be received from
devices off the network.
The Router, as its name implies, is responsible for routing data from other Routers or End
Devices to the Coordinator or to other Routers closer to the Coordinator. The Router can also
be a data input device, either serially or through the I/O pins of the module.
The End Device can only communicate with the Coordinator or a Router. An End Device cannot
communicate directly with another End Device. Communication between one End Device and
another End Device must go through the Coordinator or a Router and may go through one or
more Routers.
Figure 2 depicts a typical ZigBee network with two levels of Routers. The box labeled C
represents the Coordinator, the boxes labeled R represent Routers and the boxes labeled E
represent End Devices. As can be seen from the diagram, each End Device has multiple
potential communication paths. The most likely path is a solid line with backup paths indicated
with dashed lines. From this Figure it is seen how End Devices only communicate with Routers
and the Coordinator while Routers can communicate with End Devices, other Routers or the
Coordinator. The Coordinator can communicate with Routers and End Devices.