Guangzhou State Association, scanning firearms holder, scanner provided by the Guangzhou State Association. We are Guangzhou City State Association Information Technology Co., Ltd. (www.gzdb899.com) located: Guangzhou specializes in: cash register, scanner, bar code machines, management software, small ticket machines, cash registers, shredders everyone in use barcode scanner when it is not often that scans are not sensitive enough? Scanning speed is not fast enough? There from their own point of view this problem? Perhaps because of the difference in your scanning angle and distance affect the final results of your scan. Today I come to you to talk about how to distinguish between the scanning distance barcode scanners, because different types of barcode scanners are not the same depth of field, then scanning distance is not the same, so the depth of barcode scanners must be clearly defined. When we use the scanner bar code scanner is contact the label surface, or to maintain a certain distance outside it? In general, retail, office, and factory applications using contactless or proximity scan, warehouse, distribution and transportation applications, the typical use of remote scanning. The following types of barcode scanner depth of field are very different from each scanner, we can also see the name of the contact-type light pen requires contact with the label surface; red barcode scanner working distance limit 0-30cm, But the latest production of red barcode scanner has been effectively extended to the depth of 60cm; laser bar code scanner longest depth of field, between the 20-100cm, some specifically designed to scan large bar of special laser gun, depth of field can reach several foot depth of field through the price difference barcode scanner can be reflected. Since some users to use free supermarket cash register software process, using a serial port scanner, the software does not work properly. Therefore, this article focuses on the basic method of how to use the serial port scanner at the supermarket system to explain, I hope there is a need for users to have a reference, thereby reducing their operating costs and improve their work efficiency. If your scanner is a serial interface, then you might need to refer to this article in order to find the correct way wireless Bluetooth scanner, resulting in free supermarket cash register software to work properly connected scanner. Supermarket cash register software supports almost all scanner currently on the market, under normal circumstances, as long as you plug the scanner on the computer can be used to scan firearms rack, no special settings. In order to detect your scanner is normal, please feel free to open a Notepad file, scan the barcode scanning gun a commodity, as long as the bar code notepad appears to show that the normal scanner, otherwise scanner unusable.