The function of the bar code scanner is to read the image presented by the bar code. In its most basic form, the scanner sees and measures the absence or presence of light in the code's bars and spaces, and converts that information into an electrical signal that can be translated into recognizable or computer-compatible data. Common hand held scanning technologies includes wands, lasers, and CCDs. While they are all dedicated to the same task, reading a bar code, each scanner type offers both advantages and disadvantages, and none is clearly superior in all cases.
Hand held laser scanners are the most expensive of the scanning devices, but offer the largest depth of field making them an appropriate choice for a wide variety of non-contact applications. Hand held laser scanners use a laser diode to create a scan line by projecting a beam of energy off a rotating prism or oscillating mirror. The beam is reflected out the scanner window onto the bar code, where light energy from the bars and spaces is reflected back to the scanner, collected on a mirror, focused, and read by a photo detector. The resulting signal may then be read using decoding software within the scanner or at the terminal.
The light generating medium in first-generation moving beam laser installations was a Helium-Neon laser tube. In the past few years semiconductors capable of producing laser light have been incorporated in most laser products. Laser diodes, both visible and infrared, are in a package about the size of an LED. Compared to the gas tube used to create Helium- Neon lasers, the laser diode is much smaller, requires significantly less power, and is more durable. This makes these hand-held devices suitable for portable data collection terminals or for fixed-station decoders that are powered from the terminal.
Input devices can be grouped into three basic categories: fixed beam or moving beam, hand held or fixed mount, and contact or non-contact.
In this report, you"ll about the components and history regarding the computer. A computer is a devise that processes, organize, and calculate, displays information. It can communicate with other computers all over the world. The most powerful computer can perform 10s of billion of calculations per ...
People think the life of the Army is easy and that they can get away with many things from speeding to fighting in local bars. ... We could not sleep because this was a war simulation with real enemies who attached you with laser weapons. ... The Army has it own sets of laws which are called UCMJ (uniform code of military justices). ...
lan Fleming, a well know writer for the better part of the twentieth century, became very popular after writing twelve novels which eventually helped spawn 20 movies about a British secret agent. Fleming came up with the name, James Bond AKA 007, for the secret agent, which he took from the cover o...
Lowe's also incorporates Laser Read Transmitter (LRT) guns in the inventory process. The LRT guns read bar codes of shipping labels and the individual UPC codes from products and transmit wirelessly via radio frequency to the store mainframe. ...
General Start-up Costs First Month Rent $6,000 Electrical Modifications $10,000 Bar Renovations $30,000 Patio Construction $50,000 (Wooden Deck) Patio Furnishings $5,000 Interior Furniture $10,000 2 fire exits $2,000 2 Glass washers $4,000 2 showcase coolers $3,000 Main cooler $5,000 Bathroom Plumbing $10,000 Lights And Sound $15,000 Phone $150.00 Sign $3,000 Insurance $2,000 monthly Legal Fees $5,000 Building Permit $2,000 Engineer $1,000 Liquor License ...
What is A Robot WHAT IS A ROBOT The term robot comes from the Czechoslovakian wordfor "forced labor," invented by Karel Capek. Karel Capek used robots in his plays and had them look and behave like people. Today, the word "robot" is harder to define b...
Some common computer graphics input devices are: 1) Keyboard 2) Trackball 3) Joystick 4) Mouse 5) Paddle controls 6) Light Pen 7) Magnetic table 8) Digitizing camera 9) Scanner. 10) Bar Code Reader 11) Modem 12) Voice Recognition device. ...
Asian Indian Assimilation in the United States America is referred to in many countries as the "Land of Opportunity". This is land is also often called the "Melting Pot of the World". It is believed that people from all over the world come to the United States and lose their cultural identity and "...
