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2 PCB barcode scanner assembly instructions SIPLACE 2.12 Tips & tricks for the barcode scanner 10/2009 Edition 264 The analysis time is the time from when the scann er is switched on until the barcode is success - fu…

SIPLACE 2 PCB barcode scanner assembly instructions

10/2009 Edition 2.12 Tips & tricks for the barcode scanner

263

– The “CLV Wizard“ button is used to check or set the focus height of the barcode reader and

automatically configure it for a certain barcode type.

For further information, see section 6 / Changes in the CLV Wizard. 2

– The “FTP image output" button is used to display the image read by the scanner on the com-

puter.

The diagnostic data must have been activated in the “Image request“ menu in order to show the

guiding lines. 2

2.12.6.1 How the ICR850 works

When it is switched on, the scanner looks for possible barcode structures. 2

When it detects a possible structure, it places a barcode grid over it. 2

If the grid does not conform to the specifications, th

en the

structure is given a red border to indi-

cate an invalid scan attempt

. 2

If it does conform to the specifications, the bar

code is decoded, given a green border and output

to at the station. 2

The violet dashed lines restrict the area that the scan

ner analyzes when searching for the bar-

code. 2

2 PCB barcode scanner assembly instructions SIPLACE

2.12 Tips & tricks for the barcode scanner 10/2009 Edition

264

The analysis time is the time from when the scanner is switched on until the barcode is success-

fully decoded. The closer the blue line is to the su

ccessfully-decoded barcode, the better the pre-

set values. 2

2.12.7 Analyzing the data string in the terminal monitor

The analysis time depends entirely on the application and is the time from the start of

the scan window to the end of the scan window, so it can extend over the entire length

of the PCB.

The result must be output in SIPLACE either immed

iately or after a time set with a timer,

and must thus be shorter than the external scan window.

This value is not very informative and it comes from the linear codes.

Scanner status (0 = no code scanned)

The second line is the entire data content of the data matrix code. 2

DATX

Data matrix code detection

Scan status (0 = Code detected as correct)

Shows the symbol size and the number of working bits. The last two values are the

number of pixels or the scans per cell. If the two values are identical on average, the

speed has been set correctly.

Two values are output as a contrast; the first value shows the grayscale difference in

the data matrix symbol. A value in excess of 200 is good and the maximum possible

value is 255. This is not desirable, however, since the amplifiers are saturated at 255.

For these values, the second digit is actually the important one as it shows the

percentage usage of the redundant data bytes. 100% is critical here and shows that the

NOREAD limit has been reached. It can be tolerated in individual cases, however, but

it should not exceed 50% on average.

For PT, the coordinates of the three corner points of the L pattern of the data matrix

symbol are output. This is of less relevance in the SIPLACE application, but it can be

important in applications in which there are several codes to be scanned in the scanning

window in order to determine which codes were read. The first value is the pixel position

on the line, while the second value is the number of scans since the start of the scanning

window.

The two most important criteria are EC (percentage) and CT (contrast). 2

SIPLACE 2 PCB barcode scanner assembly instructions

10/2009 Edition 2.12 Tips & tricks for the barcode scanner

265

2.12.8 Changes in the CLV wizard

The graphical representation for setting the scanners and the focus height have changed in ver-

sion 4.2 of the CLV Setup software. 2

For a detailed description, see:

00193891-xx Retrofit instructions for PCB barcode, se

ction 1.11.6.5 Working with the CLV wiz-

ard 2

The illustration shows

the display if the scan-

ner is set correctly.

If problems occur when scanning data matrix code, even though the scanner is set correctly, then

the scanner should be set up with a skew angle of up to 25°. 2

This is particularly recommended

with low-contrast codes (e.g. CO2 or Nd-YAG lasered). 2

In this case, the focus height can

not be determined using the CLV wizard, however, and must be

set manually using the gauge supplied. 2