Elpro Technologies 455U-D Manuale Utente Scaricare il pdf (Pagina 37)

455U-D Radio Modem User Manual

Page 38 © May 2010

3.5.4 Broadcast Network

You may want a multi-hop network to broadcast messages. This takes some care at the

repeater nodes to ensure that individual repeaters do not repeat messages that they have

already repeated, and also to avoid an “end-node” receiving the same message multiple times.

Note - Before deciding to implement a multi-hop broadcast network, check the section below

on Optimum Path Routing. If your communication uses Modbus, DF1, or DNP3 protocols,

OPR may be a better way to implement your network.

You can set up a broadcast network by

using address strings of the form

<0,0,0> etc. That is, the destination

address is the wildcard 0 and the

repeater addresses are the wildcard 0.

Consider the following network:

This network has a maximum of three “hops” - to reach the most remote units, there needs to

be three transmissions or hops. Unit 1 needs to transmit with address <0,0,0> - that is, three

hops.

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Elpro Technologies 455U-D Manuale Utente Pagina 37