User's Manual

User Manual V5 CT23 Container Tag RFID-LSCAN
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3.2 CT23 Detailed Description of the Operation Modes
All modes can be enabled individually and work independently or in any combination. The transmitted UHF message format is
the same S23 format for all modes, only the flags fields’ content changes according to the mode.
3.2.1 Excitation Mode.
Indicated by the contents of the Control byte.
When enabled (WEM=Y), the tag transmits WEP number of messages each time it enters a valid S95, S21 or S23 fields. For a
field to be valid, it has to have a special pattern called exciter ID. If different exciter ID fields overlap and a tag moves from one
exciter to another it will transmit WEP number of messages each time it “sees” new exciter ID. In situations where we want to
register a tag that leaves and re-enters the field with the same exciter ID, the tag has to be out of the field for more than 1s (black
out time).
If a tag enters LF field but the valid excitation pattern can not be recognized (i.e. overlapping fields or interference), the tag does
not transmit anything.
When WSE=Y, the Excitation Mode is only active if the tag is in motion. This helps to save battery power.
3.2.2 Motion Mode
Indicated by the contents of the transmitted Control byte.
When enabled (WMM=Y), the tag transmits WMP number of messages when it is shaken or moved.
The tag has to remain motionless for WME seconds before it can recognize the next act of motion and transmit. When WME=0,
the motion black out time is 1s. By setting WME to a larger number, we can avoid multiple motion transmissions if the tag’s
moving pattern includes frequent starts and stops.
3.2.3 Beacon Mode.
Indicated by the contents of the transmitted Control byte. In Beacon Mode the transmissions occur at predetermined intervals that
equal to a programmable base time plus a random delay to avoid collisions.
When WBM=Y, the tag transmits WBP number of messages every WIM minutes and WIS seconds.
When WMM=Y, the tag transmits WMB number of messages every WMI seconds so long as it is in motion.
When WEM=Y, the tag transmits WEB number of messages every WEI seconds so long as it is in the valid LF field.
Inter-message intervals within each beacon transmission are randomized.