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3-8
The tag has the two power-saving functions below.
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Function to prevent battery power loss due to radio wave emitted from any other radio
equipment (Enabled always)
If any radio equipment is located near a tag, the tag operates (ready to operate) because the tag’s receiving band is wide. As a result, the
tag battery may be consumed. (Refer to "Notes on Interference to Second-Generation Low-Power Data Communication System (Wire-
less LAN), Cellular Phone, etc." at the beginning of this manual.)
To prevent this power loss, the tag has a function to enter a sleep state (refer to "Appendix 1 - Glossary") against a radio wave emitted
from any other radio equipment.
•
The V690 antenna sends a wake instruction (refer to "Appendix 1 - Glossary") at every 100 msec after emitting a radio wave and the
tag operates (ready to operate).
•
When the tag receives a radio wave emitted from any other radio equipment, the tag may operate (ready to operate). However, unless
receiving a valid wake instruction, the tag returns to a sleep state in 2 seconds.
Antenna radio wave emission
Wake instruction
Even if there is no command from a host device, the antenna sends a wake
instruction at every 100 msec while emitting a radio wave.
Tag
Operates (Ready to operate)
Sleep
2 seconds (fixed)
If the tag once receives a valid wake instruction in 2 sec-
onds after it started an operation, the tag does not sleep.
Tag
Operates (Ready to operate)
Sleep
2 seconds (fixed)
If the tag cannot receive a valid wake instruction in 2 sec-
onds after it started an operation, the tag sleeps.
3-7 ID Tag Power-Saving Function