SOLAR PV CONTROL SYSTEM.pdf
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equiring low delay levels. The non-beacon mode, on the other hand, is a mode<br />
wherein the channel is accessed constantly with the CSMA-CA. When this mode is<br />
used in a mesh link, with which direct communications are conducted with<br />
peripheral nodes, each node can directly communicate with any other mode at any<br />
time, while each node can also be ready to receive data addressed to that node, at all<br />
times. This need for each node to constantly remain in a reception standby<br />
condition makes it impossible to conserve energy by conducting intermittent<br />
operations as in the case of the beacon mode.<br />
Energy conserving process is available in End Devices by introducing non-beacon<br />
mode in a Star-link situation where the master unit is set as constant reception in a<br />
standby condition. To achieve this behaviour the End Devices are set to interrupt<br />
periodically in suspended or standby condition. Introducing this function in the End<br />
Device will enable request to receive data is periodically sent to master unit from<br />
End Devices. This is the main flow pattern for data in sensor networks. The figure<br />
below is an example of two types of topology that is available in IEEE 802.15.4.<br />
Figure 16: IEEE 802.15.4 star and peer-to-peer<br />
Email: david.irungu@stu.kuct.ac.ke<br />
47<br />
2012
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