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Check Digits
Check digit algorithms are pre-defined for UPC and EAN bar
codes. If you wish to apply a check digit algorithm to a
numeric text field or a bar code that has no pre-defined
algorithm, use the syntax below to define a check digit packet.
Message Structure
Syntax
{A1,A2,A3,A4,A5,A6,A7,"A8"
{ Starting token.
A1.
A
Indicates a check digit data stream.
A2.
selector
Assign a number from 1-9 to this check digit formula.
A3.
action
Options:
A = add check digit
C = clear check digit
A4.
device
Printer storage device. Options:
R = Printer RAM
M = Memory card
A5.
modulus
Number from 2-10. Modulus used in calculation.
A6.
fld-length
Number of weighting digits used. Should equal the
number of digits in the field, minus the check digit. This
number must equal the length of
weights
.
Maximum 29.
A7.
[D/P]
Algorithm.
D=sum of digits.
P=sum of products.
A8.
"weights"
String of digits used for calculation. Note that the string
must be in double quotes. The number of digits
in this string should equal the number in parameter #5 (
fld-length
).
} Ending token.
A3
A6A4
A5
A1
A2
A7
A8
WEIGHTS
HEADER
SELECTOR #
ACTION
DEVICE
MODULUS
LENGTH
ALGORITHM
A
A
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