CHAPTER FOUR – DATA CAPTURE
51
Composite Symbologies
•
Aztec Mesas (Code 39, Code 128, Code 93, Code 93i, Interleaved 2
of 5, UPC-A, EAN-13)
•
EAN•UCC Composite
•
EAN•UCC Composite with EAN Linear component
•
EAN•UCC Composite with UPC Linear component
Note!
It is possible that the symbology appears in the above-mentioned
lists but there is not a mention of it in the MHL manual nor does the ‘NID
Scanner’ applet seem to support that particular symbology. If that is the
case, and for example, you would like to test the reading of that seemingly
unsupported symbology on the PL3000; please contact the technical
support of Nordic ID to know how the symbology can be enabled and
configured on your PL3000.
In reading either one or two dimensional symbols
with the imager the range between the shortest and the
longest read distance has to do with the size of the
symbol in mils as well as with the depth of field effect.
In photography, the depth of field effect refers to plane of focus from near to far
within image. With the imager it means the range in which a symbol remains in
focus if the reader draws away from the symbol or draws closer to the symbol. As
a rule of thumb, the larger is the size of the symbol in mils the wider is the range in
which the symbol is in focus, that is, the range in which the imager can succeed in
reading the symbol.
In concrete terms,
between the 6-mil symbol and
the 35-mil symbol the
shortest read distance varies
from 11 cm to 5 cm,
respectively.
Correspondingly, the longest
read distance varies from 16
cm with the 6-mil to 33 cm
with the 35-mil symbol. The
adjacent table lists the
approximate read ranges
from the 6-mils to the 35-mils.
Be aware, that the imager
can read one dimensional
symbols being 13 mils or
greater in size further than
the table shows.
Read Range of
Imager
Symbol size Read range between
6-mil
11 cm – 16 cm
8-mil
9 cm – 19 cm
10-mil
8 cm – 23 cm
13-mil
5.5 cm – 25 cm
15-mil
5.5 cm – 26 cm
35-mil
5 cm – 33 cm
