3nStar SC550, Руководство по программированию

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Warning Tone
When the data transfer abnormal, the scanner will have four
continuous warning beeps, if this happen, please check the
cable connection is normal.
Reading skill
To get the better reading result, the aiming beam from the
scanner should be aligned in the middle of the bar code but
can be aimed in any direction for reading.
If barcode is closer to the scanner, the aim beam will be
smaller, if the barcode is farther to the scanner, the aiming
beam bigger. If the barcode is smaller, it should closer to
the scanner; If the barcode is bigger, it should farther to the
scanner, which will easier and more correct for reading.
Safety
The lighting is strong when the scanner is in use, do not
look directly at or aim at the eyes to avoid discomfort or
injury.