Code Resolution
(mm)
Conveyor Speed (m/s)
45° max
30° max
0.5
0.75
1
0.5
0.75
1
0.50
31
33
35
21
23
25
Table 6: Code 128 - EAN 128
Code Resolution
(mm)
Conveyor Speed (m/s)
45° max
30° max
0.5
0.75
1
0.5
0.75
1
0.20
12
15
18
9
11
14
0.35
22
25
28
13
16
19
0.50
25
27
30
17
20
23
9.2 Linear Code Reading
The number of scans performed on the code by the barcode scanner and therefore the decoding capability is influenced by
the following parameters:
•
Number of scans per second
•
Code motion speed
•
Label dimensions
•
Scan direction with respect to code motion
At least five scans during the code passage should be allowed to ensure a successful read.
9.2.1 Step-Ladder Mode
If scanning is perpendicular to the code motion direction, the number of effective scans performed by the reader is given
by the following formula:
SN = [(LH ÷ LS) × SS] – 2
where:
SN = number of effective scans
LH = label height (in mm)
LS = label movement speed in (mm/s)
SS = number of scans per second
TCNM AD/EX Barcode Scanner
42
