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3-7 ID Tag Power-Saving Function
3-9
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Function to prevent battery power loss due to neglect when tag works (Enabled always)
When you use the antenna with a repeat command (refer to (3) in Section 5-2-1), due to a trouble in a working site, the tag may be left
in front of the antenna which is emitting a radio wave, although the tag operates (ready to operate). Then, the tag battery is consumed.
To prevent this power loss, the tag has a function to enter a sleep state when a waiting time for sleep (refer to a chart below) has passed.
If the tag cannot receive a valid command within a waiting time for sleep after receiving a valid command, the tag enters a sleep state.
A default value of waiting time for sleep is 480 seconds (8 minutes). To change waiting time, specify "SLEP" as address in the Read/
Write command. (Refer to Sections 5-7-1 and 5-7-3 to 5-7-5.)
To recover the tag from the sleep state:
• Turn OFF the power supply transmission of the antenna and turn ON it again.
• Take the tag out of the communication area and place it in the communication area again.
Antenna radio wave emission
Tag
Operates (Ready to operate)
Sleep
(A radio wave is being emitted)
Command process
Waiting time for sleep