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The architecture of the acquisition image supporting flow control of the projector is presented. It is achieved by a simple filtering of a periodic sample string, which results in a reduction of updates of high-level concrete images. It is shown that the reduction of the observation flow performed by the filtering action equals to the ratio of the maximum and the average of the absolute value of the first signal derivative in relation to time. An example of the event-triggered signal monitoring in LonWork/EIA-709 technology as a built-in feature of an intelligent sensor device is also presented. The Neuron C code, that exemplifies the "send on delta" technique implementation in a sensor node's application program, is shown.