Rockwell Automation 2755-DM9, -DM9E High Speed Decoder - Manual (Page 54)

Chapter 4
Configuring Your Decoder
4–27
CODABAR ENABLE (d) - Selecting YES will enable the decoder to
decode Codabar bar code labels. Codabar bar code labels will not be
decoded if NO is selected.
UPC-A ENABLE (e) - Selecting YES will enable the decoder to decode
UPC-A bar code labels. UPC-A bar code labels will not be decoded if NO is
selected.
UPC-E ENABLE (f) - Selecting YES will enable the decoder to decode
UPC-E bar code labels. UPC-E bar code labels will not be decoded if NO is
selected.
EAN-8 ENABLE (g) - Selecting YES will enable the decoder to decode
EAN-8 bar code labels. EAN-8 bar code labels will not be decoded if NO is
selected.
EAN-13 ENABLE (h) - Selecting YES will enable the decoder to decode
EAN-13 bar code labels. EAN-13 bar code labels will not be decoded if NO
is selected.
Note: The decoder ignores (will not decode) UPC and EAN supplements.
Note: If you enable more than one symbology, the decoder will
autodiscriminate between the symbologies. For optimum decoder
performance, we recommend that you only enable the symbologies that you
want to decode.
Code Lengths
LENGTHS-CODE 39 (i) - You can specify up to 8 code lengths (maximum
of 64 characters) for Code 39 bar code labels. The code length includes the
check character but not the start and stop characters . If you do not want to
specify a code length, enter a zero (any lengths to the right of zero are
ignored).
Note: Specifying a code length serves two purposes:
1) It provides an additional means of checking the validity of bar code data.
When you set the decoder for specific lengths, only bar code fields that
contain the exact number of characters are decoded.
2) The decoder uses the code length information to optimize the
performance of the data acquisition circuitry. Only scans containing a
sufficient number of bars and spaces (based upon selected symbology(s)
and code length(s)) are passed on to the microprocessor for decoding.
LENGTHS-INTERLEAVED 2-OF-5 (j) - You can specify up to 8 code
lengths (maximum of 64 characters) for Interleaved 2-of-5 bar code labels.
The value you enter must be an even number. The code length includes the