airLINK network
Application Note
11 of 13
For a more extensive indication of the protocol, see specific Modbus® RTU protocol documentation.
13 MAPPING DEVICE DATA
Each component in the “airLINK” family of devices has a specific data mapping. For a description of this
mapping, see the pertinent documentation for the individual devices.
14 BASIC NOTIONS ON THE RADIO NETWORK
From the radio point of view, the “airLINK” family devices make up a network built on the ZigBee standard
from which it inherits its structure and properties. ZigBee is a proprietary-type network. For this reason the
devices in this network cannot interoperate with other ZigBee devices produced by different
manufacturers.
From the network point of view, it is composed of three different types of nodes:
C
Coordinator Node (Gateway)
R
Router (Repeater) sensors/actuators
E
End-Device sensors/actuators
A correctly built network is composed of a single
C
-type node and a variable number of
R
and
E
-type
nodes. The
C
(coordinator)-type node has the fundamental task of creating the network. The
R
(router)-
type nodes are the basic constituents of the network; they play an active role in maintaining and routing
radio traffic from and to other devices in the network.
The prerogative of the
C
and
R-type
nodes is that they are always on and have no constraints regarding
power consumption. For this reason the
C
and
R
-type nodes are generally powered from the mains.
The
E
(End-Device)-type nodes do not actively participate in network management; they engage in a
wireless dialogue with the other devices only when this proves necessary to deliver a message (and
possibly to receive a response to the message). For this reason the
E
-type nodes require less power and
can thus be powered by a battery allowing a reasonable battery life.
To be able to communicate, the
E
-type nodes must establish an unequivocal link, called relationship, with
a
C
or
R
-type node. For this reason, the
E
-type nodes must be installed in the vicinity of at least one
C
or
R
-type node.
Coordinator
(Gateway)
Bridge
Repeater
End device
E
E
E
E
E
G
R
R
B
External
supervisor
PC or PLC
N
N
Generic serial
devices
RF link
Serial link
End device
End device
End device
End device
Repeater
Fig. 14-1. Example of the topology of an airLINK network
Содержание airLINK
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