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4 4 .3.8.3
Frequency hopping
This technique is intended to prevent mutual interference between readers. The reader
changes its transmission channel in a random or programmed sequence (FHSS).
Procedure for FCC
Frequency hopping is always active in the FCC country profile. With 50 available channels
the probability is low that two readers will be operating on the same frequency. In China, one
reader operates on at least 2 channels, e.g. sixteen 2 watt channels.
You will find more information on frequency ranges in the section "Regulations applicable to
frequency bands (Page 97)".
Procedure for ETSI
Frequency hopping is optional in the ETSI wireless profile. According to
ETSI EN 203 208 V1.4.1, frequency hopping is required in multi-channel operation; without
it, only single-channel operation is possible. In this mode, the reader pauses for 100 ms after
each 4 s transmission period to comply with the standard.
4.3.9
Guidelines for selecting RFID UHF antennas
4.3.9.1
Note safety information
Before planning how to use third-party components, as the operator of a system that
comprises both RF600 components and third-party components, you must comply with the
safety information in Section Safety instructions for third-party antennas as well as for
modifications to the RF600 system (Page 19).
4.3.9.2
Preconditions for selecting RFID UHF antennas
Target group
This section is aimed at configuration engineers who thoroughly understand and wish to
carry out the selection and installation of an antenna or a cable for the SIMATIC RF600
system. The various antenna and cable parameters are explained, and information is
provided on the criteria you must particularly observe. Otherwise this chapter is equally
suitable for theoretical and practice-oriented users.
SIMATIC RF600
System Manual, 06/2019, J31069-D0171-U001-A22-7618
WARNING
RF600 system planning
4.3 Antenna configurations
51
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