Datalogic DS8110, Справочное руководство

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E-GENIUS
103
4
Field Name Action/Definition
Multi-Filter Settings
Contained Filter Select the check box to reveal the Max Number of Different Characters field.
When checked, this filter attempts to eliminate false multiple reads by
determining if a short code read is "contained in" (is a sub-string of), another
longer code read. This condition implicates that the short code is probably a
misread of the same longer code and therefore 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

all decoded codes of the same type are compared with each other
Rule 1 : the shorter code is considered contained in the longer code if the
character string is found in the same order; the longer code may have a single
block of characters in any position (before, after or in between the compared
strings)
Example: The code 123456 is considered contained in the following codes:
00123456, 12345600, 12378456.
The code
123456 is not considered contained in the following codes:
1234 65 07 (string out of order), 12345 700 (string not complete), 12 0 3 78 456
or 00 123456 00 (multiple blocks in the string).
Rule 2 : the shorter code is not filtered by rule 1. In the longer code, all possible
sub-strings of the same length as the shorter code string are compared with the
shorter code string. The shorter code is considered contained in the longer
code if the number of different characters between the compared codes is less
than or equal to the Max Number of Different Characters. The shorter code will
be filtered by rule 2.
Example:
If Max Number of Different Characters = 1:
The code
123456 is considered contained in the following codes:
123056 00, 00 123056 , 88 123056 88 because there is only one different
character in the compared string.
The code
123456 is not considered contained in 123066 789 because there
are two different characters in the compared string.
CAUTION: If the Contained Filter parameter is used
when Message Tx Selection (see section 3) is set to
On Decoding , the filter conditions may be satisfied
before the reading phase ends resulting in possible
successive multiple read errors.