171
calculate the data and decide to alarm in case of motorcycle theft. When the computer get the number of
tags, it can know that these tags are registered or not by comparing with data in the database. If the ID of
tags are detected on database with over two tags or equal. After that, the twin tags matching will be
calculated. In this case, the processing unit comparing the twin tags will show that these tags comes from
same motorcycle. Hence, the system will be displayed the normal case and save the data to the hard disk.
In the stolen case, the processing unit will get the tag's number only the bike tag. There are high
probability for the motorcycle-theft. Therefore, the system will be shown the abnormal case and alarm
occurred respectively. Although the system gets the two tags, they are not twin tags which registered on
the database. The system will act the alarm when it has been detecting the bike tags. In addition, the data
which recorded to the hard disk will contain the date and time, the twin tags number, the place and other.
Start
Read
RFID tags
Turn off ?
End
YES
NO
≥
2 tags ?
YES
Compare the tag’s
number in database
Key tag
& Bike tag
matched?
YES
Normal case
Abnormal
case
Alarm
Save data
Bike tag?
YES
NO
NO
NO
Database
Matched?
Processing at stand
Processing at center
YES
NO
Figure 2
The flowchart of data processing unit for the motorcycle anti-theft system.
2. Tag's and Reader's position.
Bike tag and key tag have been installed on one motorcycle. The headlamp mount tag model
YTG-611 which is product from Omni-ID, selected become the bike tag. It is UHF passive tags with
frequency operation between 860MHz and 960 MHz, EPC Class1 Gen2 protocol and the highest read
distance up to 12 meters with fixed reader. According to the key tag, the Omni-ID Exo 800P rigid tag has
been selected. It has frequency in the range 860-940 MHz, EPC Class1 Gen2 protocol and read distance
can be up to 8 meters when installed on plastic and read by the fixed reader. The Exo 800P tag is suitable
for motorcycle logistics detection because the material that be used as motor bike’s body is plastic.
Furthermore, the Exo 800P rigid tag has the radiation pattern which able be to get the power form the
