Omron V680 User Manual page 45

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.
Direction of travel
Calculation Example
In this example diagram, the V680-D1KP66T, V680-HA63A, and V680-HS63 are combined and 256
bytes are read.
This diagram shows the following:
Distance travelled in communications area (D) = 50 mm when Y (communications distance) = 20 mm
Communications time, T = 349 ms.
Accordingly, the movement speed in this case will be as follows:
Distance travelled in communications area
Communications time
Note 1. The distance travelled in the communications area depends on the read/write distance and the
axis offset. Refer to the diagrams in Communications Area.
2. The speed of the Tag is provided as a guideline. Before using the RFID System, run a test to
determine the speed under actual operating conditions.
3. The above values do not take into account the processing of errors in communications with the
host device or Tags.
D (Distance travelled in communications area)
T (Communications time)
Y
Communications area
D
Y
50
40
30
20
10
50 40 30 20 10 0 10 20
50 mm
50 (mm)
=
349 (ms)
= 8.60 m/min
Communications Specifications
X
Y
X
Unit: mm
X
Y
30 40 X
(Unit: mm)
Section 3
RFID System
43
User's Manual