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Code 39 barcode specification

admin November 23, 2012 Barcode Specification, Knowledge Base No Comments

Example:

Code 3 of 9 is the most popular barcode for encoding alpha-numeric characters.

Key features:

  • 2 different width of bar/space.
  • Symbol set contains 43 characters: A-Z, 0-9, and -, ., *, $, /, +, %, SPACE.
  • Each character is made up of 5 bars and 4 spaces with 3 wide bars/spaces and 6 narrow bars/spaces.
  • There is a space between each character.
  • The first and last character should always be the same (the * character)
  • The first and last 5 black bars should always follow the pattern: narrow, narrow, wide, wide, narrow.
  • The number of black bars should be divisible by 5.
  • Optional checksum character modulus 43.
  • Extended Code 39 uses 2 normal characters to represent one extended character, giving a 128-character symbol set.

Specification:

Symbol Narrow/Wide Pattern Visual Pattern Checksum Value
* NWNNWNWNN N/A
0 NNNWWNWNN 0
1 WNNWNNNNW 1
2 NNWWNNNNW 2
3 WNWWNNNNN 3
4 NNNWWNNNW 4
5 WNNWWNNNN 5
6 NNWWWNNNN 6
7 NNNWNNWNW 7
8 WNNWNNWNN 8
9 NNWWNNWNN 9
A WNNNNWNNW 10
B NNWNNWNNW 11
C WNWNNWNNN 12
D NNNNWWNNW 13
E WNNNWWNNN 14
F NNWNWWNNN 15
G NNNNNWWNW 16
H WNNNNWWNN 17
I NNWNNWWNN 18
J NNNNWWWNN 19
K WNNNNNNWW 20
L NNWNNNNWW 21
M WNWNNNNWN 22
N NNNNWNNWW 23
O WNNNWNNWN 24
P NNWNWNNWN 25
Q NNNNNNWWW 26
R WNNNNNWWN 27
S NNWNNNWWN 28
T NNNNWNWWN 29
U WWNNNNNNW 30
V NWWNNNNNW 31
W WWWNNNNNN 32
X NWNNWNNNW 33
Y WWNNWNNNN 34
Z NWWNWNNNN 35
– NWNNNNWNW 36
. WWNNNNWNN 37
SPACE NWWNNNWNN 38
$ NWNWNWNNN 39
/ NWNWNNNWN 40
+ NWNNNWNWN 41
% NNNWNWNWN 42

Checksum Calculation:

The checksum is modulus 43 sum of all the checksum values from the table above.

For example, if you are encoding the string ABCD1234 then the checksum values will be 10 + 11 + 12 + 13 + 1 + 2 + 3 + 4 = 56.

56 mod 43 = 13. So the checksum character should be D.

Extended Code 39

The Code 39 character set can be extended to a full set of ASCII characters by using 1 or 2 normal characters for each character in the extended set.

Note that a barcode reader cannot automatically determine whether a barcode is encoded normally or in the extended set.

The following table shows how to encode the full set of ASCII characters:

NUL %U SUB $Z 4 4 N N h +H
SOH $A ESC %A 5 5 O O i +I
STX $B FS %B 6 6 P P j +J
ETX $C GS %C 7 7 Q Q k +K
EOT $D RS %D 8 8 R R l +L
ENQ $E US %E 9 9 S S m +M
ACK $F SPACE SPACE : /Z T T n +N
BEL $G ! /A ; %F U U o +O
BS $H “ /B < %G V V p +P
HT $I # /C = %H W W q +Q
LF $J $ /D > %I X X r +R
VT $K % /E ? %J Y Y s +S
FF $L & /F ? %V Z Z t +T
CR $M ‘ /G A A [ %K u +U
SO $N ( /H B B \ %L v +V
SI $O ) /I C C ] %M w +W
DLE $P * /J D D ^ %N x +X
DC1 $Q + /K E E _ %O y +Y
DC2 $R , /L F F ‘ %W z +Z
DC3 $S – – G G a +A { %P
DC4 $T . . H H b +B | %Q
NAK $U / /O I I c +C } %R
SYN $V 0 0 J J d +D ~ %S
ETB $W 1 1 K K e +E DEL %T
CAN $X 2 2 L L f +F DEL %X
EM $Y 3 3 M M g +G DEL %Z
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Code 25 barcode specification →
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