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How to judge the good or bad of barcode scanner

Whether it is a supermarket or a restaurant, the cashier is already the standard for catering retailers. With the popularity of total payments such as mobile payments, it is necessary to use a scanner to pay for various payment methods. However, many user will often have the following problems: slow scanning speed, low recognition accuracy, and often cannot be scanned.
Then, how to choose a good barcode scanner, we teache you how to judge the quality of the barcode scanner.
First, let's take a look at how the scanner works. The scanner light is illuminated by an optical system onto the bar code, and the reflected light is imaged by the optical system on the photoelectric converter to produce an electrical signal, which then produces an analog voltage, filtering, shape and formation. The waveform signal is compiled by the decoder into a digital signal that can be read by a computer.
Officially, the barcode scanner is divided into handheld and fixed. The hand-held scanner has the flexibility to move a long distance; the fixed scanner can be used for large amount of scanning application.
To see the scanning accuracy of scanner, look for the resolution.
The scanner resolution we often say is the pixel that can be acquired on a 1 square inch scanned image when the image is input with the scanner. Barcode scanner label 5000 DPI refers to a 1 square inch scan area, and the image size produced after scanning is 5000 Pixel x 5000 Pixel. When scanning an image, the higher resolution you set, the better effect of the resulting image.
One condition that affects the accuracy of barcode scanner identification is to view their photosensors: photomultiplier tubes, silicon oxide isolated CCD, semiconductor isolated CCD, contact photosensors (CIS or LIDE).barcode scanner
The silicon oxide isolated CCD is superior to the semiconductor isolated CCD compared to the two CCD. Since semiconductor CCD transistor leakage affects scanning accuracy, the use of silicon oxide isolation will greatly reduce leakage, but due to the higher cost, there are fewer manufacturers using such CCDs. Of course, it is preferable to increase the temperature control because semiconductors and conductors are generally temperature sensitive and generally improve thermal conductivity.
Contact photographic equipment, in which photographic materials are generally used to manufacture cadmium sulfide cadmium sulfide, the production cost should be much lower than CCD, and the same precision CIS scanner is always cheaper than CCD scanners on the market for this reason. The scanning distance is short, the scanning resolution is low, and sometimes the nominal value is not reached, and the temperature change is more likely to affect the scanning accuracy. These are fatal problems with scanners.
To see the scanning speed of the scanner, check the interface type.
Scanners usually have three types of interfaces:barcode
1. SCSI interface: Up to 8 devices can be connected. Typically, the maximum transfer speed is 40M/s, which is faster and is usually connected to high speed devices. The installation of SCSI devices is more complicated. Usually, adding a SCSI card to a PC can easily lead to hardware conflicts, but it is powerful.
2. PP interface: Enhanced bidirectional parallel transmission interface with a maximum transmission rate of 1.5 Mbps. The advantage is that there is no need to use other cards in the PC, and the number of connections is unlimited, and the advantage is that it is easy to install and use. The disadvantage is that the speed is slower. The SCSI interface can be replaced in low-end performance requirements.
3. USB interface: 127 devices can be connected. The standard maximum transmission speed is 12Mbps. There is an auxiliary channel for transmitting low speed data. In the future, if there is a USB 2.0 standard scanner, the speed may be extended to 480M/s. With hot plug function, plug and play. Under the impetus of Intel, the scanner of this interface became popular in the establishment and promotion of the USB standard.


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