Worth Data 7000 manual Code 39 Advanced Features and Functions, Mod 43 Check Character

can vary from a low of .75 characters per inch (cpi) to a high of 9.4 cpi. There should be a ¼" "quiet zone" (white space) to the left and right of the bar code.

Code 39 uses an asterisk (*) as a start and stop character. This character must precede and follow the data in the bar code. The RF Terminal gives you the option of transmitting or not transmitting these characters when the bar code is read.

Exact specifications for Code 39 and other bar code symbologies can be obtained from ANSI at the address below:

American National Standards Institute Customer Service

11 West 42nd St.

New York, NY 10036 http://web.ansi.org document ANSI/AIM BC1-1995

Code 39 has several advanced features and functions that are discussed further in this appendix.

Code 39 Advanced Features and Functions

Mod 43 Check Character

Standard Code 39 can be printed with a "Mod 43 Check Character". This Mod 43 check character cannot be used with Full ASCII Code 39. Assigning a value to each character in the data to be bar coded from the table as follows derives the check character:

Char	value	Char	value	Char	value	Char	value
0	0	B	11	M	22	X	33
1	1	C	12	N	23	Y	34
2	2	D	13	O	24	Z	35
3	3	E	14	P	25	-	36
4	4	F	15	Q	26	.	37
5	5	G	16	R	27	space	38
6	6	H	17	S	28	$	39
7	7	I	18	T	29	/	40
8	8	J	19	U	30	+	41
9	9	K	20	V	31	%	42
A	10	L	21	W	32

Mod 43 Check character calculation for Code 39

Here is an example to illustrate how the check character is calculated for bar code data of 123XYZ:

Take the sum of the values assigned to each character: 1 + 2 + 3 + 33 + 34 + 35 = 108

1 2 3 X Y Z

Divide the sum by 43: (thus the name modulus 43) 108/43 = 2 with a Remainder of 22

Find the character corresponding with the remainder.

M(value 22) is the CHECK CHARACTER

The data becomes 123XYZM, with M added as the Mod-43 check character.