User's Manual

Multiplexing Configuration
The advantage of this configuration is that the two antennas are not enabled at the same time,
reducing interference.
8.5.2 Enabling both Antennas Simultaneously
This configuration is implemented with only one pattern which enables Antennas 1 and 2 at the
same time. This configuration is best used for detecting smart labels in 3-dimensional rotating field
applications. For more information, refer to Section 8.4, "3-D Rotating Field Applications".
In this case, a phase shift should be applied to one of the antennas in order to create a 3-D RF
field.
Both Antennas 1 and 2 are enabled and the tags detected by Antenna 1 are read and then the
tags detected by Antenna 2 are read. (Only one channel can be read at a single time.)
Channel 1 2
Pattern 1 Enabled -Enabled
8.5.3 Enabling each Antenna separately and then both at once
Depending on the application requirements, in this configuration each antenna can be enabled
separately and then both at once.
In order to implement this configuration, three patterns are necessary. The first one enables only
Antenna 1, the second enables only Antenna 2 and the third enables both Antennas 1 and 2.
Channel 1 2
Pattern 1 Enabled Disabled
Pattern 2 Disabled Enabled
Pattern 3 Enabled -Enabled
In this example, the scanning parameters must be carefully selected. As both the Scan Number
and Scan Duration parameters are the same for all three patterns, if the Scan Number is set to 1,
Antenna 2 in Pattern 3 will not be read.
If the Scan Duration is set to 100 ms. and the Scan Number is set to 2, the tags detected by
Antenna 1 will be read twice (for 100 ms each time) in Pattern 1, then the tags detected by
Antenna 2 will be read twice (for 100 ms each time) in Pattern 2. In Pattern 3, the tags detected by
Antenna 1 will be read once for 100 ms. and then the tags detected by Antenna 2 will be read once
for 100 ms.
In the event that the Scan Number parameter is set to 3, the tags detected by Antennas 1 and 2
are read three times in Patterns 1 and 2, respectively. In Pattern 3, the tags detected by Antenna 1
are read once, then the tags detected by Antenna 2 are read once, and then the tags detected by
Antenna 1 are read a second time.
Each pattern will be executed for the same amount of time regardless of the number of
antennas selected in the pattern.
This duration is equal to the Scan Number x Scan Duration.
April 2003 Revision 3.1b 29/45