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Decode Zones
Introduction
The scan ranges listed in the following tables are based on the following factors:
• Decode zone is a function of various symbol characteristics including density, print contrast, wide-to-narrow ratio and
edge acuity. Symbols test labels are examples of optimum quality bar codes.
• As distance decreases the visible scan line also decreases (visible scan length = 1.8 x distance to label x TAN (scan
angle / 2). The useable scan length is approximately 90% of visible scan line and must fully encompass the bar code label
to be successfully decoded. On larger symbol densities of 20 mil, 40 mil and 55 mil, this affects minimum decode distance.
• + / - 5° pitch is used to reduce the inhibiting effects of spectral reflection (glare) near 0° of the scan head aspect to the
bar code. Optimal operation is obtained at 2° to 15° pitch offset.
• Scan rate of 25 + / - scans second with bi-directional redundancy.
The following "good scan and decode" ranges (decode zones) are related to a specific scan engine either integrated or
connected to your Marathon. If you do not see your type of scan engine listed, you may be using a wireless (or tethered)
Bluetooth bar code scanner or a serial port-connected bar code scanner (these types of external scanners are not included
in this list).
2D Imager
Factory Default Scan Angle -- Wide (47°)
* Near distances are field-of-view limited.
1125 7Dh %R } }
1126 7Eh %S ~ ~
1127 7Fh Undefined Undefined
Symbol Density
Typical Working Ranges Guaranteed Working Ranges
Near Far Near Far
5 mil 2.1 in / 5.33 cm 7.5 in / 19.05 cm 2.5 in / 6.35 cm 6.8 in / 17.27 cm
6.67 mil 3.4 in / 8.64 cm 7.1 in / 18.03 cm 4.1 in / 10.41 cm 6.2 in / 15.75 cm
7.5 mil * 10.6 in / 26.92 cm * 9.6 in / 24.38 cm
10 mil * 10.1 in / 25.65 cm * 9.0 in / 22.86 cm
13 mil 1.6 in / 4.06 cm 15.5 in / 39.37 cm 2.5 in / 6.35 cm 14.2 in / 36.07 cm
15 mil (PDF417) * 14.7 in / 37.34 cm * 13.2 in / 33.53 cm
15 mil (Data Matrix) 2.8 in / 7.11 cm 12.4 in / 31.5 cm -- --
20 mil * 24.7 in / 62.74 cm * 21.8 in / 55.37 cm
Scan Value Hex Value
Full ASCII Code 39
Encode Char.
Keystroke ASCII Character
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