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Node# 3, 5 rebroadcast the discovery request. The request is received by Nodes 2, 4 and 6. Node 6 notes it
has a path to M through 2 and sends the route complete message to M through 2. Node 4 also rebroadcasts
the discovery request which is also received by 6; however, it is ignored by 6 since it already has a superior
route.
Once a route has been established, data can be sent through the route to the destination node. Data messages
are never broadcast to conserve power. They are only addressed to a single node (unicast) which could either
be the destination for the message or an intermediate node en-route to the destination as shown below:
The master will send all data destined for node 6, to node 2. node 2 will in turn forward the message to node
6. The other nodes do not play any role in delivering the message to node 6, thus conserving power.
If an intermediate node cannot deliver a message to the next hop, it informs the sender, which starts a new
route discovery
.
Summary of Contents for ModbusLink-M
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