Datalogic DS8110 Reference Manual page 116

4
Field Name
Max Number
of Different
Characters
Voting Filter
104
Action/Definition
Enter a value from 0 to 5 in the field provided to define the maximum number of
different characters allowed to still consider a code as being included in another
one and therefore to be filtered.
If the number of different characters between the compared codes exceeds the
value of this parameter, the codes are considered as different and will not be
filtered (a multiple read of a different code occurs).
If the number of different characters between the compared codes is less than
or equal to the value of this parameter, the short code is considered as a sub-
string of the longer code and will be filtered (no multiple read occurs).
Examples:
If Max Number of Different Characters = 2:
The code 123456 read once, is considered the same as the following codes
read multiple times: 133056, 123546, 123457 because there are two or less
different characters by position in the compared codes.
The code 123456 read once, is not considered the same as the following
codes read multiple times: 153246, 103057, 654321 because there are at
least three different characters by position in the compared codes.
Select the check box to reveal the Max Number of Different Characters field.
When checked, this filter attempts to eliminate false multiple reads by
comparing the number of different characters by position between two codes of
the same type and length. This condition implicates that reading a code of the
same type and length having very few different characters is probably a
misread of the code itself and therefore the code read the least number of times
should be ignored, (should not be considered as a multiple read of a different
code).
This filter is based upon the following rules:
 a multiple read condition occurs;
 the two codes are of the same type;
 the two codes have the same length;
 the number of different characters by position is equal to or less than the
number defined by the Max Number of Different Characters
parameter;
 Message Tx Selection (see section 3) must be set to After Reading
Phase Off.
DS8110 REFERENCE MANUAL