Motorola DS3478 - Manual (Page 37)

Digital Scanning 2 - 7
4. Hold the trigger until the digital scanner beeps, indicating it successfully decoded the bar code. For more
information on beeper and LED definitions, see
Table 2-1 and Table 2-2 .
This process usually occurs instantaneously. Steps 2 - 4 are repeated on poor quality or difficult bar codes, until the
bar code decodes, you release the trigger, or the Decode Session Timeout occurs.
Aiming
Hold the digital scanner between two and nine inches (depending on symbol density; see Decode Zones on page
2-8 ) from the symbol, centering the aiming pattern cross hairs on the symbol.
The aiming pattern is smaller when the digital scanner is closer to the symbol and larger when it is farther from the
symbol. Scan symbols with smaller bars or elements (mil size) closer to the digital scanner, and those with larger
bars or elements (mil size) farther from the digital scanner.
The digital scanner can also read a bar code within the aiming pattern but not centered. The top examples in
Figure 2-5 show acceptable aiming options, while the bottom examples do not decode.
Figure 2-5 Acceptable and Incorrect Aiming
NOTE Scanning Direct Part Marks (DPMs) with the DS3478-DP (DPM) Digital Scanner: Due to the reflective
nature of some surfaces used with DPMs (see
Figure 2-4 on page 2-6 ), to achieve the best results when
scanning DPMs, tilt the scanner at an angle relative to the target (25-45 degrees is recommended). As a
guide, if you are decoding a 23 mil dot peen mark and the scanner is set to the near field focus, present
the target between one and four inches from the nose of the scanner at a minimum tilt of 30 degrees.
When scanning standard (non-DPM) bar codes with any configuration of the DS3478 digital scanner,
follow the standard aiming instructions described in
Aiming .
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