Microscan QX Hawk Instrukcja Użytkownika Pobierz pdf (Strona 311)

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101

QX Hawk Industrial Imager User Manual 7-29

Utilities

Static Validation

Sending a <VAL> command from ESP’s Terminal will cause the imager to perform a static

validation operation on a Data Matrix symbol and will output validation results to the Terminal.

Output Screen

Data Matrix validation information is output in the format below in response to the <VAL>

command.

Note:

If the imager fails to decode the Data Matrix symbol, a No Read message is displayed.

Validation Parameters

Symbol Contrast

Usage: Lets the user know if contrast settings are less than acceptable.

Definition: All the pixels that fall within the area of the test symbol, including its

required zone, will be sorted by their reflectance values to select the

darkest 10% and the lightest 10% of the pixels. The arithmetic mean of

the darkest and the lightest pixels is calculated and the difference of the

two means is the Symbol Contrast.

(ANSI) Symbol Contrast grading is defined this way:

A (4.0) if SC ? 70%

B (3.0) if SC ? 55%

C (2.0) if SC ? 40%

D (1.0) if SC ? 20%

F (0.0) if SC ? 20%

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