Whether it is a supermarket or a restaurant, the cash register is already standard for catering retailers. With the popularity of mobile payment and other aggregate payments, various payment methods are required, and a code scanner is necessary. But the headache for many stores is that the scanning gun occasionally has the following problems: the scanning speed is slow, the recognition accuracy is low, and often it cannot be scanned.
So, what are the points to be aware of when choosing a good cash register scanner? Tianbo, as an expert in intelligent hardware, came to teach you how to judge the quality of the cash register scanner.
First, we need to understand the working principle of the scanner. Scanner is a barcode scanner. The light emitted by the light source of the code scanning gun is irradiated onto the barcode through the optical system, and the reflected light is imaged on the photoelectric converter through the optical system, so that it generates an electrical signal, and then generates an analog voltage, which is filtered and shaped to form The wave signal is compiled by the decoder into a digital signal that the computer can read.
From the form point of view, the scanner is divided into handheld and fixed. The hand-held code scanner is more flexible and can move a larger distance; the fixed code scanner can liberate both hands and is suitable for occasions with a large amount of code scanning.
Depends on the scanning accuracy of the code scanner and the resolution
The resolution of the scanning gun that we often say refers to that when the image is input by the scanning gun, pixels can be collected on a scanning area of ​​1 square inch. The code scanner marked with 5000DPI refers to the scanning area of ​​1 inch square, and the size of the image generated after scanning is 5000Pixel × 5000Pixel. When scanning an image, the higher the scanning resolution is set, the finer the effect of the generated image.
One of the conditions that affects the accuracy of the scanner identification is to look at their photosensitive devices: photomultiplier tubes, silicon oxide isolated CCDs, semiconductor isolated CCDs, and contact photosensitive devices (CIS or LIDE).
Compared with the two types of CCD, silicon oxide isolated CCD is better than semiconductor isolated CCD. Because the leakage phenomenon between semiconductor CCD transistors will affect the scanning accuracy, using silicon oxide isolation will greatly reduce the leakage phenomenon, but due to the higher cost, fewer manufacturers use this type of CCD. Of course, it is better to add temperature control, because both semiconductors and conductors are generally sensitive to temperature, and the conductivity of heating will generally increase.
Contact photosensitive device, the photosensitive material it uses is generally the cadmium sulfide we use to manufacture the photoresistor. The production cost should be much lower than that of CCD. The CIS scanner with the same accuracy on the market is always much cheaper than the scanner It is for this reason. The scanning distance is short, the scanning resolution is low or sometimes the nominal value is not reached, and the temperature change is relatively easy to affect the scanning accuracy. These are the fatal problems of this scanning gun.
Depends on the scanning speed of the scanner, depends on the interface type
There are usually three types of interface for the scanner:
1. SCSI interface: Up to 8 devices can be connected, usually the maximum transmission speed is 40M / S, the speed is relatively fast, generally connected to high-speed devices. The installation of SCSI devices is more complicated, and a SCSI card is usually added to the PC. It is easy to cause hardware conflicts, but it is powerful.
2. PP interface: An enhanced bidirectional parallel transmission interface with a maximum transmission speed of 1.5Mbps. The advantage is that there is no need to use other cards in the PC, and the number of connections is unlimited. The advantage is that it is easy to install and use. The disadvantage is that it is slower. It can replace the SCSI interface in low-end and low-end performance requirements.
3. USB interface: connect up to 127 peripherals, the standard maximum transmission speed is 12Mbps, there is a secondary channel for transmitting low-speed data. In the future, if there is a USB2.0 standard scanner speed may be extended to 480M / s. With hot swap function, plug and play. Scanners with this interface are gradually becoming popular as the USB standard is established and promoted by Intel.
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