 Anywhere there is a barcode; there is a scanner to read it. The whole reason for developing barcodes was to find a more accurate way of reading and transferring data. Barcodes and scanners are used in virtually every aspect of conducting business that involves a tangible product.
How they work
- Scanners consist of two main parts, the electro-optical (light source) and the data processor. These may or may not be in the same unit.
- Basically, the scanner focuses light onto the barcode, and by reading the reflection, takes the information back to the data storage or processing device.
- Scanners can get very complex and some are actually mini-computers with an integrated scanner. (These are then called terminals.)
- The information read is usually saved into a computer directly (via cables), or stored inside the scanner and dumped in a "batch" into a computer at various times throughout the day.
- There is a whole science devoted to scanning technology, and improvements are happening every day, so the selection of a scanner covers a lot of ground, including specific application, current scanners already in use, and personal preference.
Types of Scanners
- Contact - the code must be moved across the face of the scanner, or the scanner moved across the face of the code, by a person. (The wand you use to clock in with.)
- Non-Contact Fixed Beam - The person must point the scanner at the code (at a slight angle), then move it through the barcode to read it. (Inventory takers at convenience stores)
- Non-Contact Moving Beam - The person points the scanner at the barcode and moving mirrors inside the scanner pass the light through the code. (Watch the stockers at Wal-Mart) This type is also called "point and shoot".
- CCD Scanners - These are basically the same as the Non-Contact Moving Beam scanners, except that a different technology allows them to have a moving beam, but no moving parts inside the scanner. (Done by electronics.)
- Card Readers - Credit and debit card stations.
- Coded Output - This is where the data has been converted inside the scanner into something the computer can read.
- Undecoded Output - This is where the computer itself accepts the raw data and decodes there.
- Fuzzy Logic - This is a scanner that has extra features that can read even a damaged barcode and still make sense of it.
Methods of use
- Hand held - wand, gun type, or terminal
- Vehicle mount - forklift usually.
- Fixed position - grocery store cash registers, automated manufacturing.
Connectivity
Scanners must relay the information they acquire to some data collection unit, somewhere. This is called connectivity. The connectivity is based on the way they are hooked up to their computer. Virtually all scanners are linked to their computer via a keyboard wedge. This unit fits in electrically between the computer keyboard and the computer itself.
Range
Another issue with scanners is their range. As discussed, some must actually make contact with the barcode in order to read it. Others can scan a shelf label 10 feet away. Applications depend on the customer requirements. All use what is called "line of sight". In other words, there must be a straight, clear, path between the scanner and the object being scanned. |
