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IUH-F192-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.
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.
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.
4.3.3
Polarization
The polarization of the electromagnetic wave emitted by an antenna depends on the
electromagnetic field component and the position of the antenna. Polarization can be either
linear or circular. To achieve the maximum detection range for a UHF system, the polarization
of the read/write head must match the polarization of the tag. Refer to the relevant data sheet to
find the polarization of the tag.
Linear polarization: When an electromagnetic wave has linear polarization, the direction
of the vector of the electromagnetic field component is constant. Linear polarization can
be either vertical or horizontal. This characteristic depends on the position of the antenna.
Circular polarization: When an electromagnetic wave has circular polarization, the vector
of the electromagnetic field component rotates around an axis parallel to the direction of
emission. The rotation of the antenna around the transmission axis has no effect.
The integrated antenna of the IUH-F192-V1-* read/write head has dual linear polarization. The
read/write head operates in combined mode by default. In combined mode, both horizontal and
vertical polarization are used for each read/write access. This increases the reading reliability
of tags with an unknown location in the room.
If the orientation of the tags is known, you can optimize the access time by setting a fixed
polarization. To do this, you can switch the polarization to horizontally linear polarization or
vertically linear polarization via the IDENTControl control interface software. The linear
polarization plane refers to the preferred mounting direction with the cable connection mounted
vertically downwards.
Figure 4.3
1
= Vertical polarization plane
2
= Horizontal polarization plane
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