User's Manual

7-2 Calculating the speed of the Tag
7-2
7-6
When communicating with a Tag in motion, select Auto or Repeat for the
communications method.
The maximum speed at which the Tag can travel can be obtained easily,
using the formula below.
D (travel distance in communications
area)
Max. traveling speed =
T (communications time)
x Safety factor (0.5)
Calculate D from the communications area drawing between the Antenna
and the Tag or from the actual measurement.
：The formula above is for communications with one Tag. Be sure to check
the traveling speed of multiple Tags in advance.
Notes on the passing speed evaluation:
1） As a precaution to ensure minimal noise, the Reader/Writer performs retransmission tests in the event of a
communication error between the Tag and antenna. Since the transmission time is dependent on the noise
conditions in each environment, a transmission test using the actual device must be conducted in advance. The
calculation formula for the communication time does not assume retransmission.
2） The calculation formula above assumes the communication with one Tag. The communication with multiple
Tags in transit must be tested in advance. It cannot be calculated with the formula. The anti-collision
algorithm for the access to multiple Tags is derived from a probability theory; the communication time will
fluctuate depending on how the collisions occur, which means enough time must be allowed for the
communications.
Communications
area
Direction of travel