Barcode readers read cards that have alternating light and dark bars of varying widths. These bars are read by an optical scanner. The width and spacing in the bars depends upon the bar code protocol used. The advantage of this technology is that it is cheaply produced. This factor, however, also acts as a disadvantage, as it makes it easy for those to duplicate real bar codes by photocopying them.
The passport reader reads an item of magnetic oxide tape that is certainly laminated on the back of an card. This type of card is pretty inexpensive, but is vunerable to wear, and to be misread. Also, it is usually reproduced for fraud, though significantly less easily because the barcode badges.
Weigand readers read cards which may have embedded ferromagnetic wires. The ferromagnetic wires a strategically placed to make an identification number. These cards hold the advantage of not being prone to wear, unlike the barcode and magnetic stripe cards, and they are very difficult to duplicate. Consequently, weigand readers became extremely popular at some point. Now they are now being replaced by proximity readers.
A passport scanner will not use the weigand technology, although it is still called a “Weigand reader.” The proximity reader radiates a 1″ to 20″ electrical field around itself. When a proximity card is presented to the reader, the electrical field excites a magnetic coil inside card. The coil charges a capacitor, and the capacitor charges an integrated circuit. The circuit provides the card number for the coil, which sends it to the reader.
The last audience the smart reader. These readers possess the latest technology inside the form of an imbedded microprocessor and memory. It differs from the proximity card for the reason that the devspky89 function with the microprocessor is always to give the various readers the identification number. There are two types of smart cards: contact and contact-less. A contact smart card has eight contacts, which must touch contacts for the reader. The contact-less smart badges implements a similar radio-based technology as the proximity card, with the exception that it runs using a higher frequency. These cards tend not to even have to be taken out of an wallet to be read. Smart badges have been targeted by criminals, who tamper together before they’re sent to customers, stealing numbers and data from them.
These five different varieties of magnetic card reader each have their particular pros and cons. The five types are; Barcode, Magnetic Stripe, Proximity Card, and Smart readers. The card reader may be developed over time, with efforts to ensure safety from fraud, and convenience for users.