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 inst ant aneously. S tep s 2 - 4 are repeated on poor quality or dif ficult bar co des, 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 patter n is smaller when the dig it al scanner is closer to the symbol and larger when it is farther from the
symbol. Scan symbols with smaller bar s 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 co de 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 Incor rect 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 ma rk 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.
012345
012345
012345
012345