Frequency Hopping - Siemens SIMATIC RF600 System Manual

RF600 system planning
4.3 Antenna configurations
Application example for RF620R/RF630R
The following example explains measures for enhancing the data access security from the
RF620R reader to transponders:
● The antennas are placed next to each other and are aligned in parallel (see arrangement
B in Chapter Dense Reader Mode (Page 46)).
● Radiated power is limited to 27 dBm (ERP) or 500 mW (ERP).
● The RF620R readers have been rotated through 90° around the z axis.
In addition, the following characteristics are to be fulfilled:
● Length of data to be read/written on the transponder: 99,99%
● Length of data to be read/written on the transponder: 512 bits (64 bytes)
● Transponder type RF630L (6GT2810-2AB03)
The table below provides an overview of the minimum distances to be observed depending
on the radiated power and maximum possible number of transponders for the RF620R/
RF630R readers if the above-named requirements must be fulfilled:
Mode Max.
number of
tags
Single tag mode: 1
Read
Single tag mode: 1
Write
Multitag mode: 40
Read
Multitag mode: 10
Write
See also
RF660A antenna (Page 175)
4.3.7.4

Frequency hopping

This technique should prevent mutual interference between readers. The reader changes its
transmission channel in a random or programmed sequence (FHSS).
Procedure for 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 60)). 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 58)).
50
Radiated power Min. distance [m] between
dBm (ERP)/ mW - two RF620R readers
(ERP)
- two RF660A antennas operated with RF630R readers
- one RF620R and one RF660A antenna operated with a RF630R
reader
27 dBm (ERP)/ 3
500 mW (ERP)
27 dBm (ERP)/ 3
500 mW (ERP)
27 dBm (ERP)/ 6
500 mW (ERP)
27 dBm (ERP)/ 6
500 mW (ERP)
Draft Version 02.06.2010
System Manual, 06/2010, J31069-D0171-U001-A10-7618
SIMATIC RF600