Barcode 93

Barcode 93 format can encode the same characters as Barcode 39, i.e. 43 characters: 26 capital letters, 10 numbers and 7 special characters (-, ., $, /, + , %, ⌴ (space) as well as * which is also used to note the beginning and the end of the barcode. However, it uses 4 other special characters noted ($), (/), (+), (%) which are used only in its extended code 93 variant.

Each character is coded on 9 elements and includes 3 black bars (of different thickness). All characters always start with a black band and alternate white and black.

Here is the character mapping table:

0	100010100	1	101001000	2	101000100	3	101000010
4	100101000	5	100100100	6	100100010	7	101010000
8	100010010	9	100001010	A	110101000	B	110100100
C	110100010	D	110010100	E	110010010	F	110001010
G	101101000	H	101100100	I	101100010	J	100110100
K	100011010	L	101011000	M	101001100	N	101000110
O	100101100	P	100010110	Q	110110100	R	110110010
S	110101100	T	110100110	U	110010110	V	110011010
W	101101100	X	101100110	Y	100110110	Z	100111010
-	100101110	.	111010100	⌴	111010010	$	111001010
/	101101110	+	101110110	%	110101110	*	101011110
($)	100100110	(/)	111011010	(+)	111010110	(%)	100110010

A complete 93 barcode begins with * and ends with 2 control characters followed by a final *.

A variant of barcode 93 allows the 128 ASCII values to be coded using the 4 special characters '($) ¹', '(/) ²', '(+) ³', '(%) ⁴' as a prefix.

Code 93	ASCII Code	Code 93	ASCII Code	Code 93	ASCII Code	Code 93	ASCII Code
⁴U	0	¹A	1	¹B	2	¹C	3
¹D	4	¹E	5	¹F	6	¹G	7
¹H	8	¹I	9	¹J	10	¹K	11
¹L	12	¹M	13	¹N	14	¹O	15
¹P	16	¹Q	17	¹R	18	¹S	19
¹T	20	¹U	21	¹V	22	¹W	23
¹X	24	¹Y	25	¹Z	26	⁴A	27
⁴B	28	⁴C	29	⁴D	30	⁴E	31
⌴	32	²A	33	²B	34	²C	35
$	36	%	37	²F	38	²G	39
²H	40	²I	41	²J	42	+	43
²L	44	-	45	.	46	/	47
0	48	1	49	2	50	3	51
4	52	5	53	6	54	7	55
8	56	9	57	²Z	58	⁴F	59
⁴G	60	⁴H	61	⁴I	62	⁴J	63
⁴V	64	A	65	B	66	C	67
D	68	E	69	F	70	G	71
H	72	I	73	J	74	K	75
L	76	M	77	N	78	O	79
P	80	Q	81	R	82	S	83
T	84	U	85	V	86	W	87
X	88	Y	89	Z	90	⁴K	91
⁴L	92	⁴M	93	⁴N	94	⁴O	95
⁴W	96	³A	97	³B	98	³C	99
³D	100	³E	101	³F	102	³G	103
³H	104	³I	105	³J	106	³K	107
³L	108	³M	109	³N	110	³O	111
³P	112	³Q	113	³R	114	³S	115
³T	116	³U	117	³V	118	³W	119
³X	120	³Y	121	³Z	122	⁴P	123
⁴Q	124	⁴R	125	⁴S	126	⁴T	127
⁴X	127	⁴Y	127	⁴Z	127

The decryption of Code 93 consists in the binary reading of the black and white bands (usually via a laser barcode scanner) then in their translation via the coding table.

Code 93 uses two characters named C and K for the checksum.

Step 1: Associate with each character of the barcode the value of its position in the coding table (starting from 0)

Step 2: Multiply the value found in step 1 by its position in the message starting from the end (starting from 1)

Step 3: Add all the values found and calculate the result modulo 47.

Step 4: Add this character at the end of the barcode.

Do these steps twice, the first time to find C and the second time to find K.

Barcode 93 has a classic graphic form (black and white lines) or a binary representation (noted with 1 or B for black bars and 0 or W for white bars).

The barcode has a variable length. It begins and ends with the character * or 101011110.