Multi-Bit (Mark) Functions - Pitney Bowes FastPac DI900 Manuallines

2 • DI900/DI950 Scan Code Concepts
DI900/DI950
Scan Codes
and Levels
✍
TIP: See the Scan
Functions with Their
Assigned Bits table on
page 2-24 for a com-
plete list of multi-bit
functions. Any function
that has more than a 1
in the "Maximum OMR
Bits" or "Maximum
BCR Bits" column is a
multi-bit function.
✍
TIP: The more marks/
bits assigned to a
multi-bit counting func-
tion, the higher the
number the system can
count to before repeat-
ing. A higher number
is useful when work-
ing with large jobs and
you want to ensure the
least amount of dupli-
cate numbers within
the job. This allows the
system to detect miss-
ing pages and reduces
the chances of com-
bining two mailpieces
by accident within the
inserter (and hence,
increases integrity).
2-22

Multi-Bit (Mark) Functions

Certain scan functions may use more than one bit (or mark) as part of their
functionality – these are called multi-bit (or multi-mark) functions. Examples
include Wrap-Around-Sequence (WAS), Page Count, and Match Code marks.
Multi-bit functions need to count to a number higher than what would normally
be available if using only one mark (or bit) for their functionality. Adding other
marks/bits multiplies considerably the numbers available to count, the extent
of which is determined by the code base used in the scanning symbology.
• OMR marks – Each mark position represents a bit and is stored in a binary
(base 2) format. This means, within one mark, you can only count up to two
numbers ("0" and "1") before repeating. When you add another mark for
counting, you are multiplying by 2 the number you can count up, since it is
in a base 2 format. Consequently, two marks allow counting up to 2 x 2, or 4
numbers (0, 1, 2, 3) before repeating. The table below shows how the num-
ber combinations are created in binary by two OMR marks (bits).
OMR Marks - Two Mark (Bits) Counting
Marks Printed
none
1st mark
2nd mark
Both marks
In another example, when you use three marks for counting, you are mul-
tiplying by 4 the number you can count. Consequently, three marks allow
counting up to 2 x 2 x 2 , or 8 numbers (0, 1, 2, 3, ...7) before repeating.
The table below shows how the number combinations are created in bi-
nary format by three OMR marks (bits).
OMR Marks - Three Mark (Bits) Counting
Marks Printed
none
1st mark
2nd mark
1st and 2nd mark
3rd mark
1st and 3rd mark
2nd and 3rd mark
All marks
Decimal Binary
0 00
1 01
2 10
3 11
Decimal Binary
0 000
1 001
2 010
3 011
4 100
5 101
6 110
7 111
SV61314 Rev. A