| 摘要 |
A coded label having a leader, a unique preamble word and data words coded thereon, a system for optically reading the label, including a rotary bar scan optics for continually scanning a label from different incremental angles and generating pulse signals in response to a code thereon, and a decoder coupled to receive the pulse signals which is responsive to the leader and to the unique preamble before decoding the data words of the label, wherein the data will be decoded and displayed only after the label data words have been read twice and compared and the data is complete.
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