Omron V680-CA5D01-V2 User Manual page 266

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.
Maximum speed =
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:
D (Distance travelled in communications area)
Maximum speed =
D (Distance travelled in communications area)
T (Communications time)
Y
Movement
D
direction
Y
60
50
40
30
20
10
−70 −60 −50 −40 −30 −20 − 10
56 mm
T (Communications time)
X
Communications area
Y
Unit: mm
X
Y
0 10 20 30 40 50 60 X
(Unit: mm)
=
= 10.04 m/min
SECTION 7
Appendices
X
56 (mm)
337.2 (ms)
RFID System
User's Manual
263