In recent years, commercial companies such as major shopping malls, chain stores have recognized the huge benefits of commercial POS systems to commercial enterprise management, and they have built commercial POS network systems. For the design and installation principle of the network system, each professional publication has a detailed introduction. Here is how to choose how the commercial barcode scanner as a commercial POS system front-end data acquisition section. Commercial barcode scanners are commonly used: CCD scanners, laser handheld scanners and full angle laser scanners. First, the CCD scanner is to imaging the barcode printed pattern by using the photoelectric coated (CCD) principle, and then decodes. Its advantage is:
No rotation, motor, long service life; cheap price. When you select a CCD scanner, the most important thing is two parameters:
Due to the CCD imaging principle Similar to the camera, if it is to increase the depth of field, the corresponding lens is increased, so that the CCD is too large and inconvenient. Excellent CCD should not be readily read without tight barcodes, and in size, comfort is comfortable. Resolution If you want to increase CCD resolution, you must increase the unit elements of the photographic photosensitive element. The low price CCD is generally 5 pixels (PIXEL), the business code such as EAN, UPC is already enough, and it will be difficult for other codewords. The mid-range CCD is more than 1024pixel, some even reaches 2048pixe1, which can distinguish the narrowed barcode of 0.1mm. Second, the laser handheld scanner is a single-wire scanner using a laser diode as a light source, which mainly has two types of turns and trembling. The conversion representative brand is SP400. It is a high-speed motor to rotate a prism group, making the single-point laser light emitted by the diode into a line.
The tremble is made lower than the rotation type, but the laser gun of this principle is not easy to increase the scanning speed, typically 33 times / sec. Individual models, such as Poticon can reach 100 / sec, representing the brand for Symbol, PSC and Poticon.
When you choose a laser scanner, the business is the most important thing to pay attention to scan speed and resolution, while the depth of field is not a key factor. Because when the scenery is increased, the resolution will be greatly reduced. Excellent handheld laser scanners should be high scanning speed, high resolution within a fixed depth of field. Third, the full angle scanner is a barcode scanner of laser refraction or multiple scan lines emitted by the optical system, main purpose is to reduce the labor of the barcode when the receiving staff is recorded, and should pay attention to it. Scan line spot distribution:
There are multiple parallel lines in one direction; there are multiple scan lines at a certain point; the interpretation probability of each point is tended to be consistent in a certain spatial range. Full angle scanner in line with the above three points must be the first choice for merchants
