Fontware Limited - Barcode font support, Interleaved 2 of 5

What is Interleaved 2 of 5?

Interleaved 2 of 5 consists of 99 characters for numeric data only. Interleaved 2 of 5 also has an optional check digit.

How do I encode Interleaved 2 of 5?

Example data 1234567890

Please note the data must be an even set of numbers, if not add an extra 0 to the start of your data.

Next the data is paired in to two set's of numbers. eg. 12 34 56 78 99

This gives us a new set of numbers, each number refers to a table, list below. The numbers indicate the character which must be used, or simply add 33 to the paired number value to give the final ASCII font position.

If any paired value is 94 or over then you must add 67 instead of 33.

Data Encoding

Values are obtained from the Interleaved 2 of 5 encoding table.

Paired Data	12	34	56	78	90
Interleaved 2 of 5 Value	45	67	89	111	123
ASCIICharacter	-	C	Y	o	{

Compiling the Interleaved 2 of 5.

Start Character	170
Data	-CYo{
Stop Character	171

Barcode Font Sample.

2of5.gif (3522 bytes)

Why do I need a check digit?

A check digit is often used to provide a mathematical check to ensure the accuracy of the data you are encoding.

How do I encode Interleaved 2 of 5 with a check digit?

Example data 1234567890
Starting from left to right, assign an alternate 3,1,3,1.. Multiply the data and add the results to give you sum.

Check Digit Encoding Table

Data	1	2	3	4	5	6	7	8	9	0
Multiply	3	1	3	1	3	1	3	1	3	1
Total	3	2	9	4	15	6	21	8	27	0
Total	95.

The Modula 10 from the total is 5, so the check digit is 5.

The calculated check digit is then added to the end of our data. Now we have to encode the data as shown above.

Example data 012345678905

Note that a Zero has been added to the start of the data, this is because

Interleaved 2 of 5 requires an even number of digits.

Data Encoding
Values are obtained from the Interleaved 2 of 5 encoding table.

Paired Data	01	23	45	67	89	05
Interleaved 25 Value	34	56	78	100	122	38
ASCII Character	"	8	N	d	z	&

Compiling the Interleaved 2 of 5 with check digit

Start Character	170
Data	"8Ndz&
Stop Character	171

Barcode Font Sample.

2of5check.gif (3183 bytes)

Interleaved 2 of 5 Character Table

Character	Hex Position	Decimal Position	Character	Hex Position	Decimal Position
Start Code	AA	170	51	54	84
Stop Code	AB	171	52	55	85
00	21	33	53	56	86
01	22	34	54	57	87
02	23	35	55	58	88
03	24	36	56	59	89
04	25	37	57	5A	90
05	26	38	58	5B	91
06	27	39	59	5C	92
07	28	40	60	5D	93
08	29	41	61	5E	94
09	2A	42	62	5F	95
10	2B	43	63	60	96
11	2C	44	64	61	97
12	2D	45	65	62	98
13	2E	46	66	63	99
14	2F	47	67	64	100
15	30	48	68	65	101
16	31	49	69	66	102
17	32	50	70	67	103
18	33	51	71	68	104
19	34	52	72	69	105
20	35	53	73	6A	106
21	36	54	74	6B	107
22	37	55	75	6C	108
23	38	56	76	6D	109
24	39	57	77	6E	110
25	3A	58	78	6F	111
26	3B	59	79	70	112
27	3C	60	80	71	113
28	3D	61	81	72	114
29	3E	62	82	73	115
30	3F	63	83	74	116
31	40	64	84	75	117
32	41	65	85	76	118
33	42	66	86	77	119
34	43	67	87	78	120
35	44	68	88	79	121
36	45	69	89	7A	122
37	46	70	90	7B	123
38	47	71	91	7C	124
39	48	72	92	7D	125
40	49	73	93	7E	126
41	4A	74	94	A1	161
42	4B	75	95	A2	162
43	4C	76	96	A3	163
44	4D	77	97	A4	164
45	4E	78	98	A5	165
46	4F	79	99	A6	166
47	50	80
48	51	81
49	52	82
50	53	83