This work has base in the demand of research and development of data communication networks (fieldbus) to support the integration of control and automation devices for applications in agricultural systems. Agricultural systems related with the Precision Agriculture practices, with the embedded systems in agricultural machinery and with the greenhouses control and livestock systems. It is also guided by the efforts on the implementation of ISO11783 standard. The ISO11783 (also called ISOBUS) standard communication link is a common tendency to integrated different devices on agricultural machinery through an embedded control network. The ISOBUS use the Controller Area Network (CAN) as a data link protocol to perform the data communication. The correct definition of the data link configuration parameters represents one of the main challenges related to the design of CAN-based networks. The definition of these parameters has influence in the performance of the analyzed network. This work presents the research and the development of a performance analysis tool of CAN-based networks for applications in agricultural systems. This development consists of the systematization and validation of a CAN mathematical model. An analysis methodology is proposed to use the mathematical model. A simulation software was built and implements the methodology. It is expected that the implemented methodology facilitates the analysis tasks of the configuration parameters of the applications. The result obtained may assist in the performance evaluation and in the definition of an optimized configuration for the network based on CAN protocol and ISO11783 standard.
The wireless sensor network (WSN) technology has attracted increasing attention considering its potential in many application fields. In most studies on WSNs, the network is assumed to cover several static devices over a fixed coverage area. As an extension of WSN capabilities, the devices mobility and the network dynamism provide a new chain of interesting applications defined as wireless dynamic sensor network (WDSN). The initial challenge in the WDSN is to investigate whether this dynamic imposed on the network will be supported, once the used network protocol must meet the requirements for WDSN applications, such as network formation and self-organization, route discovery and communication management with the input and output of devices on the network. In order to overcome these issues, specific wireless protocols have been developed to meet the applications with device mobility in the WSN. However, these specific protocols limit the development of the WSDN since, they are isolated and proprietary solutions, instead of using a standardized protocol for interoperability. This paper presents a feasibility analysis of the ZigBee protocol for the WDSN applications. A survey of application features and requirements, as well as a discussion of advantages and limitations, regarding the adoption of the ZigBee protocol in the WDSN is presented. An implementation guide for the ZigBee WDSN is proposed in order to assist a new application of this technology. Furthermore, a proof of concept using ZigBee devices validates the implementation guide and proves the ZigBee WDSN feasibility.
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