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What are intelligent and dumb readers?

These terms are not precise, but many people use "intelligent reader" to describe one that has the ability not just to run different protocols, but also to filter data and even run applications. Essentially, it is a computer that communicates with the tags. A "dumb" reader, by contrast, is a simple device that might read only one type of tag using one frequency and one protocol. This type typically has very little computing power, so it can't filter reads, store tag data and so on.