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Code 39Code 39 is a barcode symbology developed by Intermec in 1969. It is widely used in numerous industries, including libraries and pharmaceuticals. Code 39 is a discrete (the bar(s) encoding one character are contained in a space of specified width) symbology with two different bar widths, a start sequence on its left end and an identical stop sequence on its right end, often represented in fonts as an asterisk (*). Each character is sperate from the next by a thin light bar. Code 39 can encode uppercase letters (A through Z), digits (0 through 9) and a handful of special characters like the $ sign. The barcode itself does not contain a check digit (in contrast to—for instance—Code 128). Possibly the most serious drawback of Code 39 is its low data density: It requires more space to encode data in Code 39 than, for example, in Code 128. This means that very small goods cannot be labeled with a Code 39 based barcode. However, Code 39 is still widely used and can be decoded with virtually any barcode reader. Code 39 gets its name because there are 9 light and dark bars in each code, and 3 of these bars are wide. 3 "wide" of 9 "bars". WIKIPEDIA 39 These tables outline the 3 of 9 specification: | Legend | | Format1 | Format2 | Desc | | W | B | Wide - Black | | N | b | Narrow - Black | | w | W | Wide - White | | n | w | Narrow - White |
| Code Details | | Char | Format1 | Format2 | | - | NwNnNnWnW | bWbwbwBwB | | $ | NwNwNwNnN | bWbWbWbwb | | % | NnNwNwNwN | bwbWbWbWb | | (space) | NwWnNnWnN | bWBwbwBwb | | . | WwNnNnWnN | BWbwbwBwb | | / | NwNwNnNwN | bWbWbwbWb | | + | NwNnNwNwN | bWbwbWbWb | | 0 | NnNwWnWnN | bwbWBwBwb | | 1 | WnNwNnNnW | BwbWbwbwB | | 2 | NnWwNnNnW | bwBWbwbwB | | 3 | WnWwNnNnN | BwBWbwbwb | | 4 | NnNwWnNnW | bwbWBwbwB | | 5 | WnNwWnNnN | BwbWBwbwb | | 6 | NnWwWnNnN | bwBWBwbwb | | 7 | NnNwNnWnW | bwbWbwBwB | | 8 | WnNwNnWnN | BwbWbwBwb | | 9 | NnWwNnWnN | bwBWbwBwb | | A | WnNnNwNnW | BwbwbWbwB | | B | NnWnNwNnW | bwBwbWbwB | | C | WnWnNwNnN | BwBwbWbwb | | D | NnNnWwNnW | bwbwBWbwB | | E | WnNnWwNnN | BwbwBWbwb | | F | NnWnWwNnN | bwBwBWbwb | | G | NnNnNwWnW | bwbwbWBwB | | H | WnNnNwWnN | BwbwbWBwb | | I | NnWnNwWnN | bwBwbWBwb | | J | NnNnWwWnN | bwbwBWBwb | | K | WnNnNnNwW | BwbwbwbWB | | L | NnWnNnNwW | bwBwbwbWB | | M | WnWnNnNwN | BwBwbwbWb | | N | NnNnWnNwW | bwbwBwbWB | | O | WnNnWnNwN | BwbwBwbWb | | P | NnWnWnNwN | bwBwBwbWb | | Q | NnNnNnWwW | bwbwbwBWB | | R | WnNnNnWwN | BwbwbwBWb | | S | NnWnNnWwN | bwBwbwBWb | | T | NnNnWnWwN | bwbwBwBWb | | U | WwNnNnNnW | BWbwbwbwB | | V | NwWnNnNnW | bWBwbwbwB | | W | WwWnNnNnN | BWBwbwbwb | | X | NwNnWnNnW | bWbwBwbwB | | Y | WwNnWnNnN | BWbwBwbwb | | Z | NwWnWnNnN | bWBwBwbwb | External links
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