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RFID Essentials
book

RFID Essentials

by Bill Glover, Himanshu Bhatt
January 2006
Intermediate to advanced content levelIntermediate to advanced
278 pages
12h 2m
English
O'Reilly Media, Inc.
Content preview from RFID Essentials
116 CHAPTER FIVE
Configuring Readers
Even EPC readers vary greatly by manufacturer in the number and type of options that they
offer, but some things are relatively common. Readers usually support ad hoc queries of the
type, “What IDs do you see right now?” They also usually support an asynchronous
FIGURE 5-8. A forklift with an RFID reader
FIGURE 5-9. A smart shelf system
Antenna
READERS AND PRINTERS 117
configuration, where a host on the network essentially asks the reader to send it any
updates whenever the reader “hears” something. Chapter 6 describes these options in detail.
Readers that support multiple antennas usually support two different ways of using them.
One configuration treats all of the antennas as if they are part of one big antenna and
treats tag reads that come in from any antenna as having come from one logical “source.”
This might be the configuration for a portal, as discussed in the previous section, where we
care that a tag has passed through but not which antenna it was closest to. Another option
is to configure each antenna as if it represents a unique location, a unique source. A good
use of this configuration would be for items passing on a conveyor, where one reader
might monitor antennas at multiple stations. For instance, each antenna might be in its
own tunnel enclosure ...
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Publisher Resources

ISBN: 0596009445Catalog PageErrata