Code 11, also known as USD-8, was developed as a high-density
numeric-only symbology. It is used primarily in labeling
telecommunications equipment. The symbology is discrete and is able
to encode the numbers 0 through 9, the dash symbol (-), and
start/stop characters.
Encoding
Code 11 Each character is encoded with three bars and two
spaces. Of these five elements, there may be two wide and three
narrow, or one wide and four narrow. Wide elements represent a
binary 1 while narrow elements represent a binary 0.
Check Sum
Two check digits, named C and K, are used. Normally, if the
length of the message to encoded is less than 10 characters only one
checksum ('C') is used, whereas both 'C' and 'K' are used if the
message is 10 characters or longer. The check digits are the result
of a Modulo 11 division of the sum of the products of each digit
times a weight factor. The weights for the C check digit range
from 1 to 10 while the weights for the K check digit range from 1 to
9. Weights start at the right end of the data and increment
towards the left. The dash character has a value of 10 for
purposes of check digit calculation.
Code 11 Character Set
The numbers in the table correspond to the width of the element. A 0
means the element is narrow, and a 1 means the element is wide.
ASCII
CHARACTER
|
ENCODING(Bar, Space, Bar, Space, Bar)
|
| 0 |
00001 |
| 1 |
10001 |
| 2 |
01001 |
| 3 |
11000 |
| 4 |
00101 |
| 5 |
10100 |
| 6 |
01100 |
| 7 |
00011 |
| 8 |
10010 |
| 9 |
10000 |
| - |
00100 |
| Start/Stop |
00110 |
Since the first and last element of every character is always a bar,
a narrow space is appended at the end of each character to separate
the last bar of a character from the first bar of the character that
follows.
The complete barcode is concatenating a start character + data + C
+ K + stop character.
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