| 摘要 |
A device having a first reader element acquiring data from an item using a first data acquisition method, a second reader element acquiring data from the item using a second data acquisition method, a user operated trigger generating a triggering signal for at least one of the first and second reader elements and an automatic context switch element initially activating the first reader element in response to the triggering signal, and switching the activation to the second reader element when the first reader element fails to acquire the data from the item.
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