- Code 128 is a very high density barcode symbology.
- It is used for alphanumeric or numeric barcodes. It can encode all 128 characters of ASCII.
- A code 128 consists of six sections.
- Quiet zone.
- Start zone.
- Encoded zone.
- Check character.
- Stop character.
- Quiet zone.
- GSI-128 is a subset of Code 128 and is used extensively worldwide in shipping and packaging industries as a product identification code for the container and parallel levels in supply chain.
- Code 128 includes 108 symbols: 103 data symbols and 2 stop symbols.
- The symbol consists of three black bars and three white spaces of varying widths. Each bar width is 1 to 4 modules ( a module is a unit width) wide.
- 128 A (Code set A)-ASCII characters 0 to 95, special characters and FNC-4.
- 128 B ( Code set B)-ASCII characters 32 to 127, special characters and FNC-1-4.
- 128 C (Code set C) 00-99 (encodes two digits with a single code point) and FNC-1.
- The check digit is a weighted modulo-103 checksum. It is calculated by summing the start code 'value' to the products of each character's 'value' multiplied by its position in the barcode string. The start character and first encoded value are in position 1. The sum of the products is then reduced modulo 103. The remainder is then converted back to one of the 103 non-delimiter characters (following the instructions given below) and appended to the barcode, immediately before the stop character.
- For example, in the following table, the code 128 variant A checksum value is calculated for the alphanumeric string PJJ123C.
Value | 128A | 128B | 128C | ASCII Code (Common/Barcodesoft) | Character (Common/Barcodesoft) | Bar/Space Pattern | Bar/Space Weights |
---|---|---|---|---|---|---|---|
0 | space | space | 00 | 0032 or 0212 / 252 | Space or Ô / ü | 11011001100 | 212222 |
1 | ! | ! | 01 | 33 | ! | 11001101100 | 222122 |
2 | " | " | 02 | 34 | " | 11001100110 | 222221 |
3 | # | # | 03 | 35 | # | 10010011000 | 121223 |
4 | $ | $ | 04 | 36 | $ | 10010001100 | 121322 |
5 | % | % | 05 | 37 | % | 10001001100 | 131222 |
6 | & | & | 06 | 38 | & | 10011001000 | 122213 |
7 | ' | ' | 07 | 39 | ' | 10011000100 | 122312 |
8 | ( | ( | 08 | 40 | ( | 10001100100 | 132212 |
9 | ) | ) | 09 | 41 | ) | 11001001000 | 221213 |
10 | * | * | 10 | 42 | * | 11001000100 | 221312 |
11 | + | + | 11 | 43 | + | 11000100100 | 231212 |
12 | , | , | 12 | 44 | , | 10110011100 | 112232 |
13 | - | - | 13 | 45 | - | 10011011100 | 122132 |
14 | . | . | 14 | 46 | . | 10011001110 | 122231 |
15 | / | / | 15 | 47 | / | 10111001100 | 113222 |
16 | 0 | 0 | 16 | 48 | 0 | 10011101100 | 123122 |
17 | 1 | 1 | 17 | 49 | 1 | 10011100110 | 123221 |
18 | 2 | 2 | 18 | 50 | 2 | 11001110010 | 223211 |
19 | 3 | 3 | 19 | 51 | 3 | 11001011100 | 221132 |
20 | 4 | 4 | 20 | 52 | 4 | 11001001110 | 221231 |
21 | 5 | 5 | 21 | 53 | 5 | 11011100100 | 213212 |
22 | 6 | 6 | 22 | 54 | 6 | 11001110100 | 223112 |
23 | 7 | 7 | 23 | 55 | 7 | 11101101110 | 312131 |
24 | 8 | 8 | 24 | 56 | 8 | 11101001100 | 311222 |
25 | 9 | 9 | 25 | 57 | 9 | 11100101100 | 321122 |
26 | : | : | 26 | 58 | : | 11100100110 | 321221 |
27 | ; | ; | 27 | 59 | ; | 11101100100 | 312212 |
28 | < | < | 28 | 60 | < | 11100110100 | 322112 |
29 | = | = | 29 | 61 | = | 11100110010 | 322211 |
30 | > | > | 30 | 62 | > | 11011011000 | 212123 |
31 | ? | ? | 31 | 63 | ? | 11011000110 | 212321 |
32 | @ | @ | 32 | 64 | @ | 11000110110 | 232121 |
33 | A | A | 33 | 65 | A | 10100011000 | 111323 |
34 | B | B | 34 | 66 | B | 10001011000 | 131123 |
35 | C | C | 35 | 67 | C | 10001000110 | 131321 |
36 | D | D | 36 | 68 | D | 10110001000 | 112313 |
37 | E | E | 37 | 69 | E | 10001101000 | 132113 |
38 | F | F | 38 | 70 | F | 10001100010 | 132311 |
39 | G | G | 39 | 71 | G | 11010001000 | 211313 |
40 | H | H | 40 | 72 | H | 11000101000 | 231113 |
41 | I | I | 41 | 73 | I | 11000100010 | 231311 |
42 | J | J | 42 | 74 | J | 10110111000 | 112133 |
43 | K | K | 43 | 75 | K | 10110001110 | 112331 |
44 | L | L | 44 | 76 | L | 10001101110 | 132131 |
45 | M | M | 45 | 77 | M | 10111011000 | 113123 |
46 | N | N | 46 | 78 | N | 10111000110 | 113321 |
47 | O | O | 47 | 79 | O | 10001110110 | 133121 |
48 | P | P | 48 | 80 | P | 11101110110 | 313121 |
49 | Q | Q | 49 | 81 | Q | 11010001110 | 211331 |
50 | R | R | 50 | 82 | R | 11000101110 | 231131 |
51 | S | S | 51 | 83 | S | 11011101000 | 213113 |
52 | T | T | 52 | 84 | T | 11011100010 | 213311 |
53 | U | U | 53 | 85 | U | 11011101110 | 213131 |
54 | V | V | 54 | 86 | V | 11101011000 | 311123 |
55 | W | W | 55 | 87 | W | 11101000110 | 311321 |
56 | X | X | 56 | 88 | X | 11100010110 | 331121 |
57 | Y | Y | 57 | 89 | Y | 11101101000 | 312113 |
58 | Z | Z | 58 | 90 | Z | 11101100010 | 312311 |
59 | [ | [ | 59 | 91 | [ | 11100011010 | 332111 |
60 | \ | \ | 60 | 92 | \ | 11101111010 | 314111 |
61 | ] | ] | 61 | 93 | ] | 11001000010 | 221411 |
62 | ^ | ^ | 62 | 94 | ^ | 11110001010 | 431111 |
63 | _ | _ | 63 | 95 | _ | 10100110000 | 111224 |
64 | NUL | ` | 64 | 96 | ` | 10100001100 | 111422 |
65 | SOH | a | 65 | 97 | a | 10010110000 | 121124 |
66 | STX | b | 66 | 98 | b | 10010000110 | 121421 |
67 | ETX | c | 67 | 99 | c | 10000101100 | 141122 |
68 | EOT | d | 68 | 100 | d | 10000100110 | 141221 |
69 | ENQ | e | 69 | 101 | e | 10110010000 | 112214 |
70 | ACK | f | 70 | 102 | f | 10110000100 | 112412 |
71 | BEL | g | 71 | 103 | g | 10011010000 | 122114 |
72 | BS | h | 72 | 104 | h | 10011000010 | 122411 |
73 | HT | i | 73 | 105 | i | 10000110100 | 142112 |
74 | LF | j | 74 | 106 | j | 10000110010 | 142211 |
75 | VT | k | 75 | 107 | k | 11000010010 | 241211 |
76 | FF | l | 76 | 108 | l | 11001010000 | 221114 |
77 | CR | m | 77 | 109 | m | 11110111010 | 413111 |
78 | SO | n | 78 | 110 | n | 11000010100 | 241112 |
79 | SI | o | 79 | 111 | o | 10001111010 | 134111 |
80 | DLE | p | 80 | 112 | p | 10100111100 | 111242 |
81 | DC1 | q | 81 | 113 | q | 10010111100 | 121142 |
82 | DC2 | r | 82 | 114 | r | 10010011110 | 121241 |
83 | DC3 | s | 83 | 115 | s | 10111100100 | 114212 |
84 | DC4 | t | 84 | 116 | t | 10011110100 | 124112 |
85 | NAK | u | 85 | 117 | u | 10011110010 | 124211 |
86 | SYN | v | 86 | 118 | v | 11110100100 | 411212 |
87 | ETB | w | 87 | 119 | w | 11110010100 | 421112 |
88 | CAN | x | 88 | 120 | x | 11110010010 | 421211 |
89 | EM | y | 89 | 121 | y | 11011011110 | 212141 |
90 | SUB | z | 90 | 122 | z | 11011110110 | 214121 |
91 | ESC | { | 91 | 123 | { | 11110110110 | 412121 |
92 | FS | | | 92 | 124 | | | 10101111000 | 111143 |
93 | GS | } | 93 | 125 | } | 10100011110 | 111341 |
94 | RS | ~ | 94 | 126 | ~ | 10001011110 | 131141 |
95 | US | DEL | 95 | 200 / 240 | È / ð | 10111101000 | 114113 |
96 | FNC 3 | FNC 3 | 96 | 201 / 241 | É / ñ | 10111100010 | 114311 |
97 | FNC 2 | FNC 2 | 97 | 202 / 242 | Ê / ò | 11110101000 | 411113 |
98 | Shift B | Shift A | 98 | 203 / 243 | Ë / ó | 11110100010 | 411311 |
99 | Code C | Code C | 99 | 204 / 244 | Ì / ô | 10111011110 | 113141 |
100 | Code B | FNC 4 | Code B | 205 / 245 | Í / õ | 10111101110 | 114131 |
101 | FNC 4 | Code A | Code A | 206 / 246 | Î / ö | 11101011110 | 311141 |
102 | FNC 1 | FNC 1 | FNC 1 | 207 / 247 | Ï / ÷ | 11110101110 | 411131 |
103 | Start Code A | 208 / 248 | Ð / ø | 11010000100 | 211412 | ||
104 | Start Code B | 209 / 249 | Ñ / ù | 11010010000 | 211214 | ||
105 | Start Code C | 210 / 250 | Ò / ú | 11010011100 | 211232 | ||
106 | Stop (7 bars/spaces) | 211 / 251 | Ó / û | 1100011101011 | 2331112 | ||
— | Reverse Stop used to detect reading right to left |
— | — | 11010111000 | 211133 |