ThingMagic Mercury API v1.23.0 - Manual (Page 28)

Reading Tags - The Basics
28 Level 1 API
N <= 2 Q
For example, if return on N tags is 3, then optimal Q is 2, but there is a chance that
module may find and report 4 tags.
See sample codelets in the SDK.
Note
Not currently supported with Continuous Reading .
Reading Tag Memory
Additional methods for reading individual tags are available in the Level 2 API .
ReadListener
Classes that implement the ReadListener interface may be used as listeners
(callbacks) for background reads. The interface has one method:
void tagRead(Reader r, TagReadData t)
This method is called for each tag read in the background after Reader.startReading() has
been invoked.
See the example applications, i.e. readasync.java, for typical implementations.
C A U T I O N !
! !
When performing asynchronous read operations the reader is operating
in a continuous or pseudo-continuous read mode. During this mode per-
forming other tag or reader operations, including GPIO operations, are
not supported. As such, other tag and reader operations MUST NOT be
performed within the tagRead() ReadListener method. Doing so can
have unexpected results.
Use
Embedded TagOp Invocation in order to perform an operation on every tag
found, or perform Reader.read() and iterate through the tags found, perform-
ing the desired tag operations on each.
ReadExceptionListener
Classes that implement the ReadExceptionListener interface may be used as
listeners (callbacks) for background reads. The interface has one method: