Operation; General; Basic Command Process - Pepperl+Fuchs IUH-F190-V1-FR2-12 Manual

IUH-F190-V1-*, IUT-F190-R4-V1*

Operation

6 Operation
6.1

General

The sections below contain information about the commands that relate to your read/write
head. The commands are described using the example of an IDENTControl control interface
with serial interface. All other generally applicable commands and error messages or status
messages can be found in the manual for your IDENTControl control interface.
Commissioning of the IUT-F190-R4-V1-* read/write head with integrated RS-485 interface is
also carried out using the commands and parameters described. For details regarding the IUT
F190-R4-V1-* read/write head see chapter 6.7
6.2

Basic Command Process

Interference Due to Multipath Propagation
The electromagnetic waves radiated by the read/write head do not just follow the direct route to
the tag, but are also reflected off objects in the vicinity, meaning that multiple partial waves
overlap with the waves radiated by the read/write head.
This overlap causes interference (i.e., exaggeration and dampening of the reception field
strength), leading to almost complete degradation. Depending on the environment, several
reflections may occur with differing intensity and distance. These different reflections lead to a
field strength in the measurement range that is difficult to predict. In the areas of degradation,
the prevailing field strength is weaker than the minimum detection field strength of the tag. As a
result, the tag cannot be activated for communication. Exaggeration of the field strength may
lead to unwanted excessive detection ranges.
1. Detection range
2. Degradation
3. Excessive detection ranges
The reflections and the resulting spatial inhomogeneity of the field strength depend on the fre-
quency used. The absolute value of the field strength depends on the transmission power.
Since the tags move in the measurement range of the read/write head, and the environment
can change, it is advisable to repeat the commands at different transmission frequencies and
at varying power. Different transmission frequencies are advisable, since the manufacturing tol-
erances and the immediate environment of the tag have an effect on the tag's resonance fre-
quency.
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