MIKE MEYERS COMPTIA RFID+ CERTIFICATION PASSPORT in Software

Make QR Code in Software MIKE MEYERS COMPTIA RFID+ CERTIFICATION PASSPORT

In applications where high speed is not required, selection is more about penetration and range than performance For example, animal tracking is typically done with LF technology, since it functions well around liquids (that is, large bodies such as cattle, zoo animals, pets, and so on) and are read as the animal is contained within a given area or walking past a reader Another application of this technology is the use of RFID tags in ignition circuits In this scenario, read speed is not critical because the key is in the car, close to the reader as it sits in the On position If the tag is seen, the car starts If it is not, the car assumes a counterfeit key is being used and it will not start In toll-tracking applications, the tags (usually UHF and microwave for their fast data transfer rates) usually transmit a simple identity, which is then processed by the back-end system to charge the user of this tag for traveling on a road or bridge For toll systems, the active technology is often used for enhanced range so that the data can be processed before the vehicle passes through the portal constructed on the highway Some toll systems use specialized passive UHF tags, such as the toll system in the Dallas/Fort Worth area of the United States The system has to capture the tag ID If the tag is not present or is expired, a camera system is triggered to take a picture of the vehicle and driver To fulfill all of these functions in a matter of seconds, the RFID systems must have sufficient read range, fast data transfer rate, and very fast interface with the back-end system and a camera

Many forms of tags are available on the market You should base your choice on the tagging volume and application technology as well as the necessary protection from the environment and physical wear and tear If you intend to tag boxes in an automated manner, for example, the tags should come embedded in labels for integration into existing printing and application systems The same would apply to any high-volume tagging application, in which you need to attach a tag to an item or a shipping container quickly If you were deploying a system at a movie theater or sports arena, for example, you would use tags that can be embedded within tickets that will be handed out at admission stands Another popular form is a button tag (Figure 6-1) that can be sewn into laundry, attached to bags of money, or placed into cargo containers For bottles of pharmaceutical products, a small tag could fit nicely on the side or bottom of the bottle, as opposed to tags of larger size that are designed for use on cargo containers and that must be rugged and readable from greater distances Alternatively, you may require tags that can be embedded into pallets or plastic objects as they are being manufactured and can be used to track those same objects through the supply chain as well for warranty purposes when they return

Button tag (graphic courtesy of Texas Instruments)

Memory is also a prime consideration during the design selection phase You will choose a tag that provides an appropriate amount of memory depending on how much data and what type of data a customer needs to write to or read from the tag Active tags and semi-passive tags can contain larger amounts of memory than passive tags, because these tags can keep a memory bank powered even when it is not being queried over a long period of time The industry standard for identification number size today is 96 bits Most of the tags that house this 96-bit data identifier have a general memory capacity of 256 bits Currently, passive tags available for use in the global supply chain have up to 2048 Kbits of storage available Semi-passive and active tags usually measure their memory capacity in megabytes of data due to the on-board power The source of on-board power may not always be a battery; for instance, it can be powered from a power source to which a vehicle s tag is attached Larger memory is also required by sensors that are incorporated into a tag to keep track of sensed conditions This data can be either transmitted to an interrogator and from there to back-end systems in real time or kept in a tag s memory and transferred in batches on demand