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Sentence transition

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{{Short description|Barcode symbology}}
[[Image:code11 barcode.png|thumb|right|"''0123452''" encoded in Code 11]]

'''Code 11''' is a [[barcode]] symbology developed by [[Intermec]] in 1977, and it is used primarily in telecommunications. The symbol can encode any length string consisting of the digits 0–9 and the dash character (-). A twelfth code represents the start/stop character, commonly printed as "*". One or two modulo-11 check digit(s) can be included.

It is a discrete, binary symbology where each digit consists of three bars and two spaces; a single narrow space separates consecutive symbols. The width of a digit is not fixed; three digits (0, 9 and -) have one wide element, while the others have two wide elements.

The valid codes have one wide bar, and may have one additional wide element (bar or space).

{| class="wikitable sortable"
|+ Code 11 digits
! Character
!Widths|| Barcode
|-
| 0
|'''00001'''
|'''101011'''
|-
| 1
|'''10001'''
|'''1101011'''
|-
| 2
|'''01001'''
|'''1001011'''
|-
| 3
|'''11000'''
|'''1100101'''
|-
| 4
|'''00101'''
|'''1011011'''
|-
| 5
|'''10100'''
|'''1101101'''
|-
|6
|'''01100'''
|'''1001101'''
|-
|7
|'''00011'''
|'''1010011'''
|-
|8
|'''10010'''
|'''1101001'''
|-
|9
|'''10000'''
|'''110101'''
|-
| -
|'''00100'''
|'''101101'''
|-
|Stop/Start
|'''00110'''
|'''1011001'''
|}

{| class="wikitable" style="text-align:center"
|+ Code 11 decoding
!rowspan=2| Wide<br/>element ||colspan=3| Wide bar
|-
! Left || Middle || Right
|-
! Left bar
| 9 || 5 || 1
|-
! Left space
| 3 || 6 || 2
|-
! Middle bar
| 5 || - || 4
|-
! Right space
| 8 || * || 7
|-
! Right bar
| 1 || 4 || 0
|}
The decode table has 15 entries because the symbols with two wide bars (1, 4 and 5) are listed twice.

Assuming narrow elements are one unit wide and wide elements are two units, the average digit is 7.8 units. This is better than codes with a larger repertoire like [[Codabar]] (10 units) or [[Code 39]] (11 units), but not quite as good as [[interleaved 2 of 5]] (7 units). The non-binary symbology [[Code 128]] uses 5.5 units per digit (11 units per digit pair).

== External links ==
*[http://www.barcodeisland.com/code11.phtml Code 11 Symbology Specification] {{Webarchive|url=https://web.archive.org/web/20070202060711/http://www.barcodeisland.com/code11.phtml |date=2007-02-02 }}

{{clear}}
{{Barcodes}}

[[Category:Barcodes]]

Code 11 - Revision history

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