User's Manual

Multiplexing Configuration
8 Multiplexing Configuration
The L-L100 Reader is designed with two transmit channels but with only one receive channel. This
means that each antenna can transmit an RF field used to read tags, but tag contents can only be
read by one antenna at a single time.
Tag reading performance can be enhanced by using the L-L100 Reader to perform read
operations on both antennas one after the other.
In addition, a phase shift can be applied between Antenna 1 and Antenna 2 for 3-D rotating field
applications.
These parameters are selected in Multiplexing mode which allows the user to completely define a
system based on its multiplexing configuration.
In particular, the following parameters are defined by the multiplexing mode:
• the transmitting antennas,
• the phase shift between the antennas,
• which antenna is read, and for how long.
8.1 Windows™ DLLs
The Library Windows™ DLLs automatically manage multiple-antenna applications for the L-L100
Reader.
The DLLs take advantage of multi-channel readers (L-L100 Library) for both reading and writing
using several specific functions. For more information, refer to the Library Windows™ DLL
Programming Guide.
8.2 STX-E Protocol
The STX-E Protocol can be used to develop dedicated application programs. For more information,
refer to the MedioSTX DLL Programming Guide.
Multiplexing information is organized into patterns. A sequence contains between one and eight
patterns that are applied one after the other in a loop. The L-L100 Reader can only store a single
sequence.
Figure 9: Sequence of Patterns in a Loop
Pattern 1 Pattern 2 Pattern 3 ...Pattern n
If n
p
atterns are defined
The multiplexing mode enables the user to implement several combinations on the basis of this
physical configuration. The following paragraphs provide implementation examples and show how
to choose the pattern.
8.3 Scanning (Reading)
The scanning parameters define which antenna is read (receives tag information), when it is read
and for how long.
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