Bar code reader
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United States of America Patent
Stats
-
Mar 3, 1998
Grant Date -
N/A
app pub date -
Mar 7, 1997
filing date -
Jan 10, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A portable, hand-held, self-contained two-dimensional bar code reader adapted to the PDF417 symbology, includes a light source, a photodetector, and a decoder. The decoder comprises an 8 bit microcomputer, having an address space of 64K bytes, but actually using an 8K Byte SRAM for data storage, and 32K Byte PEROM for program instructions. Performance is enhanced by a novel program resident in the program memory, and by the use of direct memory access to load signals derived from the photodetector into memory. The unit draws an average of 1.4 watts during a reading operation when the light source is enabled and 0.83 watts during decoding when the light source is disabled. It is capable of reading an 800 character PDF417 symbol at an error correction level of 5 in about 2 seconds.
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Cited Art Landscape
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