Abstract
The paper presents a Supervisory Control and Data Acquisition System (SCADA) based on wireless communication mechanism combined with General Packet Radio System (GPRS) platform and wireless sensor networks (WSN). In order to access the services rendered by the WSNs and to extend its communication capabilities, a WSN controller was implemented with Xilinx spartan-3E, XC3S250E-4FT256C for the demand of relaying various types of monitoring and control data over a large-scale communication. In the WSN monitoring system network, a protocol stack dispatcher, known as Operating System Abstraction Layer (OSAL) over TI's ZStack protocol stack, was chosen to fulfill the strict requirement for the performance of real-time data acquisition and control, as well as the stability of operation system. Some key strategies of the supervisory of task polling were employed to make the management of the WSN controller more robust and flexible. The developed system can be efficiently used for on-site supervision and control of remote equipments in harsh environment.
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