Murata Electronics North America XDM2140 Manual Do Utilizador
1.0 XDM2140 Introduction
RFM’s XDM2140 is a 2.4 GHz IEEE 802.15.4 radio module designed to provide excellent
communications reliability and long battery life in a wide range of sensor network applications. The
XDM2140 employs DUST Networks’ SmartMesh-XD™ technology which blends the reliability of self-
organizing and self-healing mesh networking with synchronized power duty cycling to achieve very long
battery life operation. The XDM2140 is certified for unlicensed operation in the USA, Canada and
Europe. An example XDM2140 network is shown in Figure 1. The network consists of a Gateway and up
to 250 XDM2140-based Sensor Nodes. The Gateway consists of a SmartMesh-XD™ radio and a single-
board Linux computer. The Gateway includes the XDM2140 network manager function and provides the
application interfaces. The Gateway includes an Ethernet port that supports XML-based network
commands, and two RS232 serial ports that support binary string network commands, diagnostics, etc.
communications reliability and long battery life in a wide range of sensor network applications. The
XDM2140 employs DUST Networks’ SmartMesh-XD™ technology which blends the reliability of self-
organizing and self-healing mesh networking with synchronized power duty cycling to achieve very long
battery life operation. The XDM2140 is certified for unlicensed operation in the USA, Canada and
Europe. An example XDM2140 network is shown in Figure 1. The network consists of a Gateway and up
to 250 XDM2140-based Sensor Nodes. The Gateway consists of a SmartMesh-XD™ radio and a single-
board Linux computer. The Gateway includes the XDM2140 network manager function and provides the
application interfaces. The Gateway includes an Ethernet port that supports XML-based network
commands, and two RS232 serial ports that support binary string network commands, diagnostics, etc.
X D M 2 1 4 0 N e t w o r k
N e t w o r k
G a t e w a y
X D M 2 1 4 0
S e n s o r
N o d e 3
X D M 2 1 4 0
S e n s o r
N o d e 5
X D M 2 1 4 0
S e n s o r
N o d e 2
X D M 2 1 4 0
S e n s o r
N o d e 4
X D M 2 1 4 0
S e n s o r
N o d e 1
Figure 1
SmartMesh-XD™ traffic is organized in to TDMA frames consisting of 31.25 ms time slots. The Gateway
assigns time slots to each XDM2140 node in the network, and then maintains a precise report interval
(frame-to-frame period) to provide a highly synchronized network. Network operation also hops from
channel to channel in a pseudorandom pattern to mitigate the effects of multipath fading and narrowband
interference. The Gateway monitors performance on each channel and will temporarily discontinue the
use of a channel that is showing poor performance statistics.
Mesh networking allows traffic to be passed from sensor node to sensor node so that messages can be
delivered to and from sensor nodes that can not communicate directly with the Gateway. At least two
paths are maintained by the network for communication between each field node and the Gateway. As
needed, a new paths will be automatically established to replace a failing paths to maintain network
performance.
assigns time slots to each XDM2140 node in the network, and then maintains a precise report interval
(frame-to-frame period) to provide a highly synchronized network. Network operation also hops from
channel to channel in a pseudorandom pattern to mitigate the effects of multipath fading and narrowband
interference. The Gateway monitors performance on each channel and will temporarily discontinue the
use of a channel that is showing poor performance statistics.
Mesh networking allows traffic to be passed from sensor node to sensor node so that messages can be
delivered to and from sensor nodes that can not communicate directly with the Gateway. At least two
paths are maintained by the network for communication between each field node and the Gateway. As
needed, a new paths will be automatically established to replace a failing paths to maintain network
performance.