RFID System
User’s Manual
SECTION 7
Characteristics According to Operating Conditions
SECTION 7
Appendices
263
Calculating Tag Speed
When communicating with a moving Tag, specify an AUTO command or POLLING command.
The maximum speed for communicating with the Tag can be calculated simply using the following for-
mula.
D (Distance travelled in communications area) is calculated from the actual measurement or the com-
munications area between the Antenna and Tag.
Calculation Example
The following example is for reading 256 bytes with the V680-D2KF67, V680-HA63, and V680-HS63, using normal mode for the
Controller communications speed.
From the above chart,
Distance travelled in communications area = 56 mm when Y (communications distance) is 20 mm
Communications time T = 337.2 ms (calculated from the communications time on page 257, i.e., 1.2 ×
256 bytes + 30)
Therefore, the maximum speed of the Tag is as follows:
Maximum speed =
D (Distance travelled in communications area)
T (Communications time)
X
Y
Y
X
Unit: mm
D
Movement
direction
Communications area
10
20
30
40
50
60
Y
−70 −60 −50 −40 −30 −20
−
100 102030405060X
(Unit: mm)
56 mm
X
Y
Maximum speed =
D (Distance travelled in communications area)
=
56 (mm)
337.2 (ms)
= 10.04 m/min
T (Communications time)
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