Circutor airLINK, Инструкция по эксплуатации

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airLINK network
Application Note 5 of 13
1 GENERAL NETWORK CHARACTERISTICS
The “airLINK” family of devices can be used to create a network of sensors and actuators. Such sensors
and actuators are able to convey their operating data (input values and status, output settings,
parameters, etc.) to a centralizing hub device called Gateway via a wireless network based on radio (RF)
link, using an IEEE 802.15.4 compliant protocol (ZigBee, Miwi compatible).
A two-way communication is established between devices and Gateway. Besides transmitting their
operating status, the devices in the network can receive data and commands. It is possible to access the
data gathered by the Gateway through an USB/485 serial communications link using Modbus-RTU
protocol or through an Ethernet port and Modbus-TCP/IP protocol.
The Gateway is transparent for the purposes of serial communications. Whether it is a PLC or a PC with
supervision software, the client connected to the Gateway can access all the data for each individual
sensor in both read and write modes, individually addressing them as though they were wired.
The sensors/actuators are divided into two groups:
a) End sensors/actuators linked to network but without routing capability. Usually battery-powered.
b) airLINK nodes, linked to network with router functions. Usually powered from mains.(airBRIDGE,
airREPEATER , others, but only one airGATEWAY)
The radio devices in these two groups are fundamentally different. In fact, the routers are responsible for
maintaining the radio network infrastructure and extending the capacity of the Gateway, while the end
devices do not have this capacity.
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. 1-1. Example of network structure
2 BUILDING A NETWORK
The Construction of a new “airLINK” network involves the following steps:
A. Establishing the Gateway address (see paragraph 3)
B. Connecting the Gateway to a control/supervision system and turning it on
C. Creation of the network by the Gateway (see paragraph 4)
D. Opening the network by the Gateway (see paragraphs 5,6)
E. Establishing addresses for new sensor/actuator devices (see paragraph 3)
F. Turning on the new sensor/actuator devices
G. Annexing the new sensor/actuator devices into the network (see paragraph 7)
H. Closing the network by the Gateway (see paragraphs 5,6)
I.
Points E, F, G must be repeated for all devices one wishes to include in the network.
If a new device is to be inserted in an existing network, points D, E, F, G, H must be performed.