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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