20
13
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4
22
IUH-F117-V1-*
Installation
During simultaneous operation of several read/write heads, only one read/write
head may ever communicate with a tag at any given time. When arranging the
read/write heads, make sure that the measurement ranges do not overlap. You
can enlarge or reduce the size of the measurement range by changing the
transmitting power. Determine the measurement range of each read/write head at
the mounting location.
If you want to transmit with just one read/write head at any given time, use the
multiplex mode of the IDENTControl control interface. Multiplex operating mode
allows chronologically exclusive access to tags, and prevents mutual interference
from read/write heads. For a precise description, see the manual for your control
interface.
5.3.3
Polarization
The polarization of an electromagnetic wave emitted from an antenna depends on
the electromagnetic field component and the spatial position of the antenna. A
fundamental distinction is drawn between linear and circular polarization. The
polarization of the read/write head must be adapted to the polarization of the
transponder in order for a UHF system to utilize the full sensing range. Refer to the
corresponding data sheet for details on the polarization of the transponder.
■
Linear polarization: the direction of the vector of an electromagnetic field
component that generates an electromagnetic wave with linear polarization
is always constant. Linear polarization is available in a vertical and
horizontal configuration, which is dependent on the spatial position of the
antenna.
■
Circular polarization: the vector of an electromagnetic field component that
generates an electromagnetic wave with circular polarization rotates
around an axis parallel with the beam direction. The rotation of the antenna
around the communication axis has no influence.
The IUH-F117-V1 read/write head is supplied with circular polarization.
Polarization can be changed from circular to linear using the software on the
IDENTControl interface. With linear polarization, the polarization level is aligned
horizontally when the read/write head is mounted in the preferred installation
direction with the cable connection vertical facing downwards.
Note!
During mounting, take into account how the read/write heads may cause
interference with each other. The further the transmission channels of the
read/write heads are from each other, the lower the risk of interference.
