User Preferences 6 - 35
Multicode Troubleshooting
Troubleshooting Multicode Expression Programming
Use the following suggestions if encountering problems programming a multicode expression:
•
Ensure the expression is valid. Invalid expressions are rejected during programming. When an
expression is rejected the previous expression remains intact. If after programming the expression the
imager can still decode any bar code, the expression was possibly rejected.
•
When programming the multicode expression via parameter bar code, the DS457 generates beeps. If
any of the following beeps do not sound during programming, an error occurred (see Table 3-1 on page
3-4 for error indicators):
• Scanning the
Multicode Expression bar code produces a two-tone (same pitch) beep.
• Scanning each value of the expression produces a two-tone (same pitch) beep.
• Scanning the
End Of Message bar code produces a four-tone (high-low-high-low) beep.
•
Check the expression for syntax errors.
•
Try programming a simple expression to ensure the syntax is correct. See Examples of Simple Multicode
Expressions.
•
Review Notes on page 6-26 for additional hints.
Troubleshooting Multicode Mode Scanning and Decoding
Use the following suggestions if encountering problems using multicode mode:
•
If the DS457 appears to decode any single bar code instead of the intended multiple bar codes, ensure
you enabled Multicode Mode on page 6-24. Programming the multicode expression does not enable
multicode mode.
•
When specifying Region, ensure:
• Coordinates are within range the 0-100 decimal (or 0x00 - 0x64 hexadecimal).
• Top, Left is above Bottom, Right. Top, Left is 0,0 (0x00, 0x00 hexadecimal), and Bottom, Right is
100,100 (0x64, 0x64 hexadecimal).
• Regions for two or more bar codes do not overlap.
•
When specifying Code Type ensure the DS457 supports the code type. Try decoding a single bar code
without using multicode. If it does not decode try enabling the bar code type. See Chapter 12,
Symbologies.
•
Experiment with simpler expressions, then add to it until you discover the source of the error. For
example try the simplest expression (see Examples of Simple Multicode Expressions) and make sure
you can scan a single bar code. If so, extend the expression by adding a second bar code, specifying a
region, or specifying the code type. Verify that the DS457 can decode this new expression. Continue
adding to the expression until it fails to decode as expected, indicating the source of the error.
•
Review Notes on page 6-26 for additional hints.
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