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XB24CZ7RIS-004 参数 Datasheet PDF下载

XB24CZ7RIS-004图片预览
型号: XB24CZ7RIS-004
PDF下载: 下载PDF文件 查看货源
内容描述: XBee® /的XBee - PRO® ZB SMT射频模块 [XBee®/XBee-PRO® ZB SMT RF Modules]
分类和应用: 射频
文件页数/大小: 155 页 / 3791 K
品牌: DCD [ DIGITAL CORE DESIGN ]
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XBee®/XBeePRO® ZB SMT RF Modules  
This mechanism enables devices A and B to recognize that the link is not reliable in both directions and select a  
different neighbor when establishing routes. (Such links are called asymmetric links, meaning the link quality is  
not similar in both directions.)  
When a router or coordinator device powers on, it sends link status messages every couple seconds to attempt  
to discover link qualities with its neighbors quickly. After being powered on for some time, the link status  
messages are sent at a much slower rate (about every 3-4 times per minute).  
AODV Mesh Routing  
ZigBee employs mesh routing to establish a route between the source device and the destination. Mesh routing  
allows data packets to traverse multiple nodes (hops) in a network to route data from a source to a destination.  
Routers and coordinators can participate in establishing routes between source and destination devices using a  
process called route discovery. The Route discovery process is based on the AODV (Ad-hoc On-demand Distance  
Vector routing) protocol.  
Sample Transmission Through a Mesh Network  
AODV (Ad-hoc On-demand Distance Vector) Routing Algorithm  
Routing under the AODV protocol is accomplished using tables in each node that store the next hop  
(intermediary node between source and destination nodes) for a destination node. If a next hop is not known,  
route discovery must take place in order to find a path. Since only a limited number of routes can be stored on  
a Router, route discovery will take place more often on a large network with communication between many  
different nodes.  
Node  
Destination Address  
Next Hop Address  
Router 6  
Router 6  
Router 6  
Coordinator  
Router 5  
R3  
C
Router 6  
R5  
When a source node must discover a route to a destination node, it sends a broadcast route request command.  
The route request command contains the source network address, the destination network address and a path  
cost field (a metric for measuring route quality). As the route request command is propagated through the  
© 2010 Digi International, Inc.  
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