The work is devoted to investigation of functional principles of data display means building in embedded systems and definition of ways of reliability increasing of information transfer at interaction in user interface. The importance of a visual communication channel with the operator to ensure the protection of information in complex systems and responsible applications is shown. The principles of implementation of the data output subsystem in embedded systems are analyzed and it is found that the required level of information is provided only by multi-element indicator devices. The element base of indicators is investigated and determined that the most effective display elements from a reliable and ergonomic point of view for built-in applications are LEDs. Analysis of the principles of visual presentation of information showed that the analog (discrete-analog) method of data transmission to the operator provides the highest level of ergonomic parameters of indicators. In this case, the best results have a scale indication based on the additive information model. The use of color speeds up the reading of information from the scale. The control schemes of indicator elements for c
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