Increasing The Probability Of Identification For Tags - Antenna Switching - Siemens SIMATIC RF600 System Manual

Readers
5.1 RF660R reader
5.1.2.1

Increasing the probability of identification for tags - Antenna switching

To achieve a high probability of reading tags, the antenna switching function has been
implemented in the RF660R reader:
During a defined time period, the reader transmits on one antenna and receives on the other.
As long as the antenna is receiving signals from further tags, the reader continues to
transmit on the same transmitter antenna until all responding tags have been identified.
Subsequently, or if no tags respond, the reader activates another antenna as the transmitter
antenna. After all the antenna have transmitted at least once and no tag has responded, or
when the settling time is excessively long, the reader activates frequency hopping (in the
USA) or channel selection (in Europe).
Cycle 1
Antenna 1 transmits
Antennas 2 and 3 receive
90
Cycle 2
Antenna 2 transmits
Antennas 1 and 3 receive
Cycle 3
Antenna 3 transmits
Antennas 1 and 2 receive
System Manual, 10/2009, J31069-D0171-U001-A8-7618
SIMATIC RF600