Zebra KR403 Especificaciones descargar pdf (Pagina 142)

Bar Codes

Bar Code Orientation

136

P1026208-001 Rev. B Software Integrator Guide 10/29/2010

• Support for the bar code

• Resolution of the scanner

• The data to be encoded must comply with the bar codes valid characters

• Some bar codes require specified clearance around the bar code to properly read

the bar code.

Bar Code Orientation

The bar code orientation with in a receipts design is an important consideration when

programming your kiosk printer. For ladder bar code orientations, the printer’s speed

should be reduced to 3 ips (75 mm/s) and the bar code’s wide to narrow bar ratio should

be 3.0. Where possible the X module width should also be set to 3.

Other factors may also effect a bar code’s readability.

Bar Code Readability

Several factors contribute to a bar codes readability and quality.

Bars are too light (underburn)

If dark bars print too lightly they will not provide enough contrast to the light spaces. This

condition is reflected in the Print Contrast Signal measurement specified in the ANSI print

quality guidelines. The heat is not set high enough to properly change the direct thermal

stock. Heat settings are adjustable and should be changed until optimal contrast is

attained.

Overburn

When heat settings are too high, overburn results and bars become too thick, which is

also called bar growth. This causes the bar code to be out of spec and probably become

unreadable because the required wide/narrow ratio cannot be maintained. Overburn is

usually corrected by lowering the heat setting.

Figure 9-1 • Bar Code Orientation

Picket Fence

Ladder

Front of Printer

Bar

Height

1 2 ... 137 138 139 140 141 142 143 144 145 146 147 ... 157 158

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Zebra KR403 Especificaciones Pagina 142