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Depends on the antenna, frequency, the reader power, and the design.
Passive RFID's have a range from a few mm's to a few meters.
In general, low frequency = near field rf = short range, higher frequency = far field rf = longer range.
EPC HF near field tags have short ranges of less than 1 meter.
EPC UHF tags are typically 1-2 meters reliable read. Far field range is very complex and it is possible to have multipath reflection arrangements where 10 meters may work... sometimes.
With illegally high power transmitters, and large antennas, far field tags can be reliably read to tens of meters or more for non-commercial designs.
Semi-passive RFID's can be read over hundreds of meters.
Active RFID's are limited only by their transmit power and antenna design.
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Why is RFID tags used instead of bar codes use to tag goods?
Both RFID tags and barcodes are used to tag products, but RFID has many advantages. An RFID tag can be read at a distance. That helps with inventorying stock, and also helps to catch shoplifters. Retailers have a problem with shoplifters putting an expensive item in a cheap item's box; because the RFID tag would be on the product itself it wouldn't matter what box it was in.
On an average how many times you can use RFID tags?
The type of RFID tag you are referring to is likely a passive device. It gets read by stimulating it with a certain RF frequency and then looks for a unique return. Hence the tag life is essentially forever.
Are rfid readers writers compatible with all chips?
Yes and no, It is common for companies as Texas Instruments & Phillips to lock their technology. However, most reader/writers are compatible with more than their own company's chip-set. frequency range is however not interchangeable. A 125 kHz reader will never be able to read a 13.54 MHz tag.
What are disadvantage of rfid?
RFID are expensive comparied to BarcodesRFID readers struggle picking up information when passing through metal or liquid.Reader collision can occur where two signals from different readers overlap and the tag is unable to respond to both.Tag collision can occur when numerous tags in the same area respond at the same time.RFID still has two separate chips (read only and readable/writable), which cannot be read by the same machine.
What is a ribbon parameter card?
The "ribbon parameter card" is a little chip that is delivered with every newly bought pack of ribbons. You need to insert this card in the fitting slot of the printer (at the backside I assume), and let the printer read the contents of the chip. Once finished, you can remove the card. You need to follow this procedure for the printer to be able to work with the new ribbon. If you do not have the chip for that ribbon you can not use it.
