Rockwell Automation 2755-DM9, -DM9E High Speed Decoder - Manual (Page 55)

Chapter 4
Configuring Your Decoder
4–28
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 the zero are
ignored).
Note: If the decoder is going to read Interleaved 2-of-5 bar code labels, we
recommend that you specify a code length. If you do not specify a code
length, it is possible for a partial scan of symbols to be interpreted as a valid
shorter message. If two character codes are being decoded you must set the
length to 2.
LENGTHS-CODE 128 (k) - You can specify up to 8 code lengths
(maximum of 64 characters) for Code 128 bar code labels. The code length
does not include the start, stop, and check characters. If you do not want to
specify a code length, enter a zero (any lengths to the right of the zero are
ignored).
LENGTHS-CODABAR (l) - You can specify up to 8 code lengths
(maximum of 64 characters) for Codabar bar code labels. The code length
includes the start, stop, and check characters. If you do not want to specify a
code length, enter a zero (any lengths to the right of the zero are ignored).
Scanner Control
LASER-ON MODE (m)- You can select one of two options:
1) Continuous- If you select the continuous mode, the scan head will scan
continuously.
Note: Laser scanners have a turn on time of approximately 50 msec in
addition to a short warm up time. The optimum performance of the laser
scanner is achieved after the warm up period. You should refer to the user
manual for the scanner you are using.
2) Triggered - If you select the triggered mode, the scan head will only scan
when triggered by the package detector, host, or internal timer. Once
triggered, the scan head will continue scanning until the option selected in
the Decode Trigger mode field (see next section) indicates the end of the
trigger.
DECODE TRIGGER MODE (n) - You must specify how the decoder
starts and stops decoding. You have four options:
1) Package Detect - If you select package detect, the decoder will trigger on
when a package detect signal is present and trigger off when one of the
following occurs:
•
Fields per package count is met.
•
Package detect signal is off.
•
No-read timer times out.