How to judge the quality of a cash register barcode scanner

Mon Mar 06 08:29:47 CST 2023

Whether in supermarkets or restaurants, the cashier desk has become a standard part of food and beverage retailers. With the popularity of aggregate payment such as mobile payment, a scanning gun is indispensable for various payment methods. But let a lot of shop headache is that the scanning gun occasionally appears the following problems: scanning speed is slow, identification accuracy is low, often sweep out.


So, to choose a good cash register scanner, what points should be looked at? As an intelligent hardware expert Tianbo, to teach you how to judge the cash register scanner gun good or bad.


First, we need to understand how the scanner gun works. The scanner gun is a bar code scanner. The light emitted by the light source of the scanning gun is irradiated to the bar code by the optical system. The light reflected back is imaged to the photoelectric converter by the optical system to generate electrical signals and then generate analog voltage. After filtering and shaping, square wave signals are formed and compiled by the decoder into digital signals that can be read by the computer.


From the formal point of view, the scanner is divided into handheld and fixed. Handheld code scanner is more flexible, can move the distance is larger; Fixed code scanner can free hands, suitable for the occasion of a large amount of code scanning.


To see the scanning accuracy of the scanning gun, check the resolution


We often say that the resolution of the scanning gun, refers to the input image with the scanning gun, in a 1 square inch scan format, can collect pixels. A scanning gun marked 5000DPI refers to a scanning area 1 inch square, and the size of the scanned image is 5000Pixel×5000Pixel. When scanning an image, the higher the scan resolution is set, the more detailed the resulting image will be.


One of the factors that affect the recognition accuracy of the scanner is its sensor: photomultiplier tube, silicon oxide isolated CCD, semiconductor isolated CCD, contact sensor (CIS or LIDE).


Compared with the two kinds of CCD, the silicon oxide isolated CCD is better than the semiconductor isolated CCD. Because the leakage phenomenon between the semiconductor CCD audion will affect the scanning accuracy, with silicon oxide isolation will greatly reduce the leakage phenomenon, but because of the high cost, the use of this kind of CCD manufacturers are relatively few. Of course, it is better to add temperature control, because both semiconductor and conductor are generally very sensitive to temperature, temperature will generally improve conductivity.


Contact photosensitive devices, which use the sensitive material is usually cadmium sulfide which we use to manufacture photoresistor, the production cost should be much lower than CCD, CIS scanning gun of the same accuracy on the market is always much cheaper than CCD scanning gun for this reason. The scanning distance is short, the scanning definition is low and sometimes can not reach the nominal value, the temperature change is easy to affect the scanning accuracy, these are the fatal problems of this scanning gun.


To see the scanning speed of the scanning gun, to see the interface type


There are three interface types of scanning gun:

1.SCSI interface: A maximum of eight devices can be connected. Usually, the maximum transmission speed is 40M/S. SCSI devices are complicated to install. Generally, PCS need to add a SCSI card, which may cause hardware conflicts but has powerful functions. 

2.PP interface: An enhanced two-way 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, unlimited connection number, the advantage is easy to install and use. The disadvantage is that it is slow. The SCSI interface can be replaced in mid - and low-end scenarios that do not require high performance.

3.USB interface: Up to 127 peripherals can be connected, the standard maximum transmission speed is 12Mbps, there is an auxiliary channel for low-speed data transmission. In the future if there is a USB2.0 standard scan gun speed may be expanded to 480M/s. With hot swap function, plug and play. This interface scanning gun with the USB standard in the Intel push under the establishment and promotion of gradually popular.