Rockwell Automation 2755 AtomScan Bar Code Reader - Manual (Page 62)

5–17 Configuring Your Reader
Publication 2755-6.9
Code 39
•
Status
•
Check Digit. Code 39 is self-checking and does not normally
require a check digit. However, for additional data integrity, a
Modulus 43 check digit can be added to the bar code message.
With Check Digit and an External or Serial Trigger option
enabled, an invalid check digit calculation will cause a no read
message to be transmitted at the end of the read cycle.
•
Check Digit Output. When enabled, the check digit character is
sent along with the label data. When disabled, label data is sent
without the check digit.
•
Large Intercharacter Gap. Allows the reader to read labels with
gaps between bar code characters exceeding three times the
narrow element width.
•
Fixed Code Length. Used to increase data integrity by ensuring
that only one label length will be accepted.
•
Code Length. Allows you to specify the exact number of
characters that the reader will recognize (this does not include
start and stop). The reader will ignore any code not having the
specified length.
Note: Fixed Code Length must be enabled for Code Length to
take effect.
Codabar
•
Status
•
Start and Stop Match. Requires the Codabar start and stop
characters (a, b, c, or d) to match before a valid read can occur.
•
Start and Stop Output. Allows the start and stop characters to be
transmitted with bar code data.
•
Large Intercharacter Gap. Allows the reader to read labels with
gaps between bar code characters exceeding three times the
narrow element width.
•
Fixed Code Length. Used to increase data integrity by ensuring
that only one label length will be accepted.
•
Code Length. Allows you to specify the exact number of
characters that the reader will recognize (this does not include
start and stop). The reader will ignore any code not having the
specified length.
Note: Fixed Code Length must be enabled for Code Length to
take effect.
•
Check Digit. Allows you to select the type of checksum system
Codabar will use.