Actually, a bar code works in much the same way as an ordinary flashlight -by barcode reading the reader reflected light from a surface. software The barcode process begins when a device directs reader a light beam through a bar code. The device contains a small software sensory reading element. This sensor detects the light being reflected back from the bar barcode code, and converts light energy into electrical energy. The result is an electrical signal reader that can be converted into data. Bar codes are measured by the width of the narrow bar and are recorded software in mils, or 1/1000 inch. A barcode 15 Mill bar code, for instance, has a reader narrow bar that is 15/1000 inches wide. Further, "quiet zones," or blank spaces to the left and right of bar code symbols, are included to insure the bar code can be read. It''s a software three-step barcode process. First, an input device must convert light energy into reader electrical energy. software There are a variety of input devices, each barcode with its own unique characteristics.

The "wand" is the simplest and least expensive input device available. It is durable and reader contains software no moving parts. It barcode must, however, come into contact with the bar code, which can present a challenge. If a bar code must be read more than once, reader it may become smeared software or damaged and, in essence, barcode and reader and software unreadable. Also, a wand is "human powered," which means it must be held at the proper angle and moved at the proper speed. For these reasons, a wand is the best choice when cost is the largest determining factor. barcode The CCD, or "Charge reader and software Couple Device," is another common input device. A CCD is a very "aggressive" barcode instrument, with a high ability to read bar codes quickly and easily. But it has two primary limitations. reader First, it has a short "read" range, and must be held no more software than 1 to 3 inches from the bar code.

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