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5-2
Extra characters at the beginning or end of your bar code data
Clear the Preamble and Postamble.
Make sure you haven't enabled transmission of any start/stop characters,
checksums, leading digits or terminator characters that you don't want
transmitted. For UPC-E, select Compressed transmission if you don't want it
padded with extra zeros.
The reader transmits incorrect data to the screen
Reread page 12 and make sure you chose the proper Computer Interface.
If part of the data is correct and part missing, you need to tell the WDP Reader
to transmit data at a different rate. First try Learned Timing on page 12, and
if that doesn't work, resort to changing Data Transmission Timing on page 15.
If the reader is transmitting punctuation characters (!@#$%^&*) when
reading numeric bar codes, or transmitting letters in the wrong (upper/lower)
case, you may have a Num Lock, Caps Lock, shift or timing problem. Check
your keyboard to see if the Num Lock or Caps Lock keys have been activated.
Finally, try "learned timing" (See Page 12) or changing your Data
Transmission Timing (See page 15).
If you're using Code 39, read page 16 to see if you've set Caps Lock properly
for your application. If your Code 39 bar codes include punctuation
characters %, $, / or +, the reader is seeing them as part of Full-ASCII Code
39 sequences. Using the Reader Setup Menu, disable Full ASCII Code 39.
Poor read rate
Try reading the test label on page 18 (following the scanning instructions in
Appendix K) as an example of a known good bar code. Examine your bar
codes to make sure they have dark bars, clearly defined bars and white spaces,
and a "quiet zone" of at least 1/4 inch to the left and right. If the bars are grey,
or so dark that they "bleed" into the white spaces, the person or organization
printing them will need to adjust the printer or get a new ribbon or toner
cartridge for it.
Carefully follow the scanning instructions Appendix K when reading any and
all bar codes. As straightforward as scanning may seem, many people who call
Worth Data with a complaint about poor read rate are simply not doing it
correctly.
If you're using an infrared bar code wand, be sure the bar codes you're trying
to read were printed with infrared-quality ink. Make sure you're using the
right type of wand (see page 19) for the type of bar codes you're trying to read.
Pry the wand tip off; clean the inside with a soft, lint-free cloth. Carefully blow
off any debris from the red plastic lens.
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