Optimization Of Robustness Of Tag Data Accesses For Readers That Are Operated Simultaneously; Frequency Hopping - Siemens SIMATIC RF600 System Manual

This greatly reduces the probability of interference.
4.3.8.3 Optimization of robustness of tag data accesses for readers that are operated
simultaneously
Parameter data access reliability
If several readers are to be operated simultaneously in an environment, then the following
settings affect the reliability of the reader's access to transponder data:
● Electromagnetic environment (see section The response of electromagnetic waves in the
● Type of transponder (see section Transponder/tags (Page 265))
● Number of transponders to be detected by an antenna at a time
● Type of antenna (see section Antennas (Page 187), section Guidelines for selecting RFID
● Transponders' distance from and orientation toward antennas (see section
● Distances and orientation of antennas of different readers to each other
● Radiated power of antennas
The robustness of tag data accesses is improved for readers whenever distances to
adjacent readers are increased, radiated power is reduced, and a channel plan (for ETSI
readers) is implemented. Adjacent readers are parameterized in the channel plan such that
they cannot use the same channels.
A channel plan can be created for ETSI readers; for FCC readers, it is assumed that the
probability of two readers accidentally using the same channel is very low.
4.3.8.4

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
Frequencyhopping is always active with FCC. The 50 available channels mean that the
probability is low that two readers will be operating on the same frequency (see Section
Regulations for UHF frequency bands in the USA (Page 81)). In China, one reader operates
on at least 2 channels, e.g. 16 channels of 2 W (see Section Regulations for UHF frequency
bands in China (Page 76)).
SIMATIC RF600
System Manual, 05/2012, J31069-D0171-U001-A13-7618
UHF band (Page 72))
UHF antennas (Page 54), and section Planning application (Page 99))
Transponder/tags (Page 265))
RF600 system planning
4.3 Antenna configurations
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