Hardware manual

71
Maximum Readable Digits
In this chapter, the definition for maximum no. of readable digits and each maximum no. of digits of the
conventional symbologies are explained. See Table 4.42.
All the digits in the table are reference and may vary according to conditions including barcode print quality
and surrounding environment.
• Definition
Figure 4.5
Table 4.42 Maximum no. of readable digits for conventional 1D symbologies
Maximum no. of digits
Resolution
(mm)
Max.
scanning
range
(mm)
Max.
scanning
digits
defined
range
(mm)
Max.
scanning
width H
direction
(mm)
Barcode
marginal
space (one
side)
(mm)
Code39
N/W=1/2.5
Code93
Code128
(ASCII)
Code128
(Numeric
only)
ITF
N/W=1/2.5
NW7
N/W=1/2.5
6mil (0.15) 115 87 65 1.5 26 41 33 67 49 30
8mil (0.20) 150 120 89 2.0 27 42 34 69 51 31
10mil
(0.254)
170 139 103 2.5 24 39 31 63 47 28
13mil
(0.33)
200 167 123 3.3 22 35 28 57 43 26
15mil
(0.38)
205 172 127 3.8 19 30 25 50 38 23
20mil (0.5) 260 224 164 5.1 19 29 24 48 36 22
40mil (1.0) 410 365 267 10.2 14 22 18 37 29 17
Scanning distance
Maximum Scanning digit define range
(20mm Over)
Maxmum Scanning width
&
Maximum Scanning digit define distance
near far
Scanning distance
Maximum Scanning digit define range
(20mm Over)
Maxmum Scanning width
&
Maximum Scanning digit define distance
near far