In fact, the serial barcode scanner and keyboard barcode scanner, its advantages and disadvantages who is a: external power supply. Why use a serial barcode scanner? External power supply in appearance a bit ugly, but a power connector must Cadogan scanner, but precisely because of this, it does not use the computer's power supply voltage is guaranteed. Some bar code scanner for voltage requirements are relatively high, keyboard port connected barcode scanner after this load, the voltage is low down radium code scanner wholesale, not working. And serial port can take a variety of host devices: PC, cash registers, terminals, barcode scanner keyboard port in the application scope is not as good as it. Let's make a comparison, in fact, should choose serial or keyboard port according to their own needs. Compare the contents of the serial keyboard port USB port power supply external, such as organic within the power supply can also be modified, such as PC, POS machines are also available from the PS / 2 fetch electricity (expert level in order to do so) keyboard port to take power, no external power supply USB port , no external RS232 standard length by 200 feet (60 meters) scanner which brand of good, practical but also longer 1.5 to 5 m USB specification 1.5 to 3 meters Applications PC, POS, industrial machines, terminals, data terminals construction PC, part of the POS machines, part of the terminal PC, Mac driver Scanpard, WinCom2key, com2key need to be supported by Windows, Windows built-speed input speed scanner has not been tested together with the other two classification in recent years to the merchant POS system Construction tremendous benefits barcode scanner price, the system is also inseparable from the bar code scanner, bar code and the system as an input connected to the link, barcode scanner plays an irreplaceable role. Under the user to select a reliable and cheap in price performance of the scanner, the first thing you must understand how to select the scanner, scanner which classification. Here are some scanner classification, the most important business applications, there are three: CCD scanner, handheld laser scanner and the whole point of the laser scanner. A, CCD barcode scanner CCD barcode scanner is the use of optical coupling (CCD) principle, barcode printing pattern is imaged, and then decoded. Advantages are: no long shaft, motor, life; cheaper prices. When selecting CCD scanner, the most important are the two parameters: depth of field due to CCD imaging principle is similar to a camera, if you want to increase the depth of field, to increase the corresponding lens, so that the CCD size is too large, inconvenient operation. Excellent CCD should not be close to the bar code can be read, and moderate size, comfortable operation. Second, the laser handheld barcode scanner handheld laser bar code scanner is the use of laser diodes as a light source, single-scanner, which are mainly rotating mirror and chatter mirror two. Commercial enterprises in the choice of laser bar code scanner, the most important thing is to pay attention to the scanning speed and resolution, and the depth of field is not the key factor. Because when the depth of field increases, the resolution will be greatly reduced. Excellent hand-held laser scanner scanning speed should be high, a fixed depth of field high resolution. (Recommended) Guangzhou State Association scanner | radium code scanner wholesale | scanner provided by the Guangzhou State Association. Looking for "cash register, scanner, bar code machines, management software, small ticket machines, cash registers, shredders" fly suppliers, network operators choose to have a full alliance Certified: Guangzhou Contracting State Information Technology Co., Ltd. ( www.gzdb899.com), trustworthiness and reliability, now click on the "Business Alliance customer service" on page live chat with us now!