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Remote controlling of industrial systems requires a special approach. There are requirements for both the connection and the access terminals. The connection should provide users with reliability, security and quality, and the access terminals should be able to perform the required task. One important and at the same time a problematic requirement for a mobile controlling system is bidirectional access. In this paper, the authors describe a system which enables bidirectional data access within 3G cellular network using a commercial service, and a prototype application for quality and usability for task performance using a terminal recognition method.
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