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7-4 Communication Time (Reference)
7-5
(2) Multi (several tags)
The communication time of Multi command varies depending on the number of processed bytes, the number of tags and designation of
communication designation S/M/L. Average values are shown below.
(3) How to calculate maximum movement speed of tag
The maximum movement speed of tag moving at the front of antenna is calcu-
lated as follows:
Travel in communication area
Communication time
Example of calculation (1)
Calculate the movable speed of tag, based on the distance 1 m between the antenna and tag and 32-byte read.
If the distance is 2 m in the communication range 2m mode, the area width is 0.8 m.
The communication time of 32-byte read is 12 ms.
0.8 m
0.8 m
12 ms
0.012 x 1 / 60 (minutes)
Example of calculation (2)
Calculate the movable speed of tag, based on the distance 4 m between the antenna and tag and 256-byte read.
If the distance is 4 m in the communication range 5 m mode, the area width is 1.5 m.
The communication time of 256-byte read is 19 ms.
1.5 m
1.5 m
19 ms
0.019 x 1 / 60 (minutes)
Communication designation
Number of tags
Average communication time (ms)
U
1
17
S
Approximately 4
66
M
Approximately 8
128
L
Approximately 16
256
Correct Usage
The tag movement time above is a value of the best example. In an actual operation, taking into consideration periph-
eral objects and radio wave environment at the working site, design a system that a margin was removed from the calcu-
lated value and execute a test in the working site.
Travel
Tag
Antenna
Maximum movement speed =
Maximum movement speed =
= 4 km per minute (= 240 km per hour)
=
Maximum movement speed =
= 4.7 km per minute (= 280 km per hour)
=