Code Reader 1200 Instrukcja Instalacji Pobierz pdf (Strona 32)

TC1200 REFERENCE MANUAL

2.4.2 Step-Ladder Applications

In Step-Ladder reading applications scanning is perpendicular to the code motion direction

(Figure 11). For linear barcode reading, this has the advantage of being insensitive to

blurring and code resolu

tion since the code elements remain the same between consecutive

scans.

The number of scans performed on the code and therefore the decoding capability is

influenced by the following parameters:

 number of scans per second (320 scans/sec. max)

 line speed (code motion) see par. 2.4.1

 label

dimensions

At least 5 scans during the code passage should be allowed to ensure a successful read.

The number of effective scans performed by the reader in step-ladder is given by the

following formula:

SN = [(LH/LS)

SS] – 2 Where: SN = number of effective scans

LH = label height (in mm)

LS = line speed in (mm/s)

SS = number of scans per second

Figure 11 - "Step-Ladder" Reading

Example:

The TC1200 (320 scans/sec.), for a 25 mm high code moving at a line speed of 500 mm/s

performs:

[(25/500)

320] - 2 = 14 effective scans.

Direction of code

movement at LS speed

Illuminator

TC1200

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 175 176

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Code Reader 1200 Instrukcja Instalacji Strona 32