MAINTENANCE AND ACCESSORIES
SECTION 8.5
VER.V09F
The general format of EAN 13 is shown in Fig 8,2, 12 CHARACTER
BAR CODE, As can be seen, there are 3 types of guard patterns;
2 normal guard patterns and a centre guard pat.tern. Only 12 of
the 13 digits are represented by barcodes and the 13th digit
must be calculated by considering the mixture of characters
which represent the first 6 digits. The first 6 digits are
represented by characters chosen from either Set A or Set B,
whilst the last 6 digits are represented by characters from Set
Conly, See Fig 8,3, CODING OF NUMBER CHARACTERS, The allowed
combinations of Set A and Set B characters are shown in TABLE
8.4, COMBINATION OF SET A AND SET B CHARACTERS.
The general format of EAN 8 is shown in Fig 2,3, 8 CHARACTER BAR
CODES. Note in this case that the first 4 digits are all chosen
from Set A and the last 4 digits from Set C. Again, the guard
bars are present,
Due to the fixed parity (all from Set C) of the last 6 digits in
EAN-13 and the last 4 digits in EAN-8, both types of barcodes
may be scanned in either direction, i.e. the barcodes are bi-
directional,
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