User Manual

54
Section 3 Communication Time (Reference)
RFID System
User's Manual
Section 3
Communications Specifications
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
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 = 1.3N +31 = 1.3 × 256 + 31 = 363.8 (ms)
Accordingly, the movement speed in this case will be as follows:
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.
Maximum speed =
D (Distance travelled in communications area)
T (Communications time)
X
Y
Y
X
Unit: mm
D
Direction of travel
Communications area
Y
−50 −40 −30 −20 −10 0 10 20 30 40 X
(Unit: mm)
50 mm
X
Y
40
30
20
10
50
=
Distance travelled in communications area
Communications time
50 (mm)
363.8 (ms)
= 8.24 m/min