Telegesis (UK) Limited
TG-ETRXn-UG-01-103
9
User Guide
1.04
ETRX1 and ETRX2
©2008 Telegesis (UK) Ltd
ETRXn User Guide (Rev 1.04)
After identifying all of the devices in the network we can also send messages to any devices within
range. In order to send a broadcast message to all of the devices,
use the “AT+BCAST:”
command followed by the number of hops you want the broadcast to travel followed by the text you
wish to broadcast, or simply press th
e “Broadcast Button” and enter parameters into the Command
line. (E.g. “AT+BCAST:01,Hello World”)
In order for the remote nodes to display received data they will need to be connected to a PC‟s
serial port.
It is also possible to send data to an individual node using a Unicast. To send a Unicast press the
“Unicast” button and then double click on the entry of the recipient in the “Discover Devices”
window and enter the data you wish to transmit preceded by an equal sign. If you do not know the
syntax of a command, hold the mouse pointer over the respective button and the tool tip text will
display the format of the command as shown in Figure 10.
Figure 10. Tool tip texts
So far we have set up all of the hardware required for a meshing network, identified and named the
individual modules using the Telegesis Terminal Software and actioned a few simple commands in
order to learn the functionality of the AT-Style command line interface.
This level of complexity may well be all you need for your application. Before we now look at
additional commands we need to introduce some more theoretical information about wireless mesh
networks.
3 Network Management
3.1 Overview
A ZigBee
®
(-like) network is formed from the inside out. This means that a device which is
instructed to start a network becomes a so-called coordinator and scans all available radio
channels, picks the one with the least traffic and generates a random PAN ID in order to start a
network; other nodes can then join in.
