Bar code scanners are used to read the bar codes found on products in a wide collection of situations. Most of us are well-known with bar codes found on packages at the grocery store. When you purchase an item, the bar code on the container is scanned by a bar code scanner. This automatically calls up the item particulars such as the item name and unit cost. The cost is then calculated automatically and added to your bill.
At the same time the stock operate system records the fact that you have purchased a can of soup or box of cereal, and the inventory tally maintained in the central database is reduced to reflect the fact that someone has purchased one of these items. inventory operate is more or less automatic, assuming that all the data was input correctly in the first place.
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In a small firm setting implementing such a system starts with stock operate software where facts about inventory items is stored. Bar code scanners are used to input data into the stock operate system. Each time an item passes in or out of inventory it is scanned and the suitable convert of status is recorded in the inventory database.
Such a system can even originate unique bar codes for items that do not already have them. For new items a unique bar code is generated by the software, and then a bar code printer is used to print a bar code label that is then affixed to the item.
Here are the three most favorite types of bar code scanners currently in use:
1. The Wand Scanner - The most basic type of bar code scanner is the "wand". This is a pen-type scanner that needs to be kept in palpate with the bar code when scanning it. The wand emits a light which is reflected off the bar code and then decoded by the system to identify the item.
The wand system works well in most applications, and it is by far the least expensive type of bar code scanner. A typical wand costs about 1/10th the price of a laser gun, and about 1/5th the price of a Ccd scanner.
But wand scanners have their limitations. In order to get an precise scan the wand must be held at a fairly precise angle relative to the bar code. It must also be slid over the bar code at a speed that is neither too fast nor too slow. And all wand bar code scanners have a resolution limit. If a bar code has a resolution that is significantly finer than the wand scanner, the scanner will not be able to read it correctly. For example, a 10 mil wand cannot read a 5 mil bar code. It is prominent to keep this in mind when purchasing a wand scanner.
2. The Ccd Scanner - Ccd (charged coupled device) technology is the next least expensive bar code scanning system. Like the wand scanner, Ccd readers must be in direct palpate with the bar code label in order to read it. But unlike the wand, there is no need to move the expedient over the label. The operator naturally presses the reader against the label and pulls the trigger. The bar code is then photographed, digitized and decoded by the system.
Of the varied types of bar code scanners, Ccd readers are the easiest to use, and are ready in widths from about 2 inches to 4 inches. A Ccd reader is about four times the cost of a wand, but only about one third the cost of a laser scanner.
A promising new technology similar to Ccd is called Ffo (Fixed Focus Optics). These scanners are non-contact readers, which means they can read bar codes from as much as 20" away. They will also be able to read two-dimensional bar codes as they become more popular.
3. The Laser Scanner
Laser scanners use a beam of light to rapidly scan over the bar code label. This means the scanner itself remains stationary, and there is no need for direct palpate with the bar code label. Scanning is automatic in the sense that the scanning action is initiated when an object is held in front of it.
This system is favorite in many different settings. For example, since scanning is done rapidly, laser scanners can be embedded right within conveyor systems. As objects pass fast by they are scanned and recorded. In retail stores the check out someone naturally moves objects over the scanner to get underway the scanning action. This kind of system is fast sufficient to keep up with a clerk just taking objects from one side of the scanner and sliding them to the other side. Such a system is much faster and much more precise than any of the favorite alternatives currently available.
Regardless of which scanning system is best for your firm right now, be sure to purchase stock operate software that lets you implement other scanning technologies as the need arises.
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