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In order to expand the application of ZigBee wireless communication based on IEEE802.15.4, network layer of ZigBee protocol stack is developed. After introduction of the ZigBee protocol stack model, key technologies of network layer and corresponding realization method are proposed. The key technology of network layer includes wireless network management, address distribution and routing. Finally,...
A wireless scheduling platform based on ZigBee wireless communication technology was introduced in this paper. And a token ring scheduling strategy was proposed. In order to facilitate the realization of the proposed scheduling strategy, embedded real-time operating system ??C/OS-II was adopted. Through a reasonable division of system scheduling tasks and priority ceiling protocol in ??C/OS-II, the...
Supervisory control and data acquisition (SCADA) systems are used in photovoltaic (PV) power plants for monitoring, control, remote communication purposes. The ingredient of SCADA system in PV power plants is introduced in this paper. In order to improve security and reliability of the SCADA system in PV plants, this paper provides two effective solutions, security access control strategy and redundancy...
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