User's Manual
3
Chapter 2. Tag Operation
2 Tag Operation
2.1 Button Activated Location Update and Maintenance
Call
In addition to periodic location updates, the tag can also be set to scan and update it's location
when any of the buttons is pressed. After a button press the tag scans immediately and sends the
results to ERC, if White button (right-hand button on A4+) was pressed the tag will do a
maintenance call in addition to the location update . The LEDs indicate the scan success or
failure similarly as in the scan activated by the wake up interval.
2.2 Resetting to Factory Settings
The Ekahau A4 / A4+ tag can be reset to factory settings by using a button sequence as follows:
1. Press and hold the White button (right-hand button on A4+) until Left LED flashes orange. If
the tag is busy this may take even 20 seconds. NOTE: Before the Left LED flashes orange, it
may flash green/red depending on the success of the ELP packet which is sent when the
White button (right-hand button on A4+) is pressed. Do not mind about this and keep on
pressing the White button (right-hand button on A4+) until the Left LED flashes orange.
2. When the Left LED flashes orange, immediately release the White button (right-hand
button on A4+) and press down the Blue button (left-hand button on A4+).
3. After approximately 2 seconds both LEDs flash orange.
4. The tag has now been reset to factory settings. The tag is in reset mode when it does not
execute button scan.
2.3 Firmware Update
The tag firmware can be updated wirelessly using ERC. The firmware is uploaded to the tags from
the Tag Properties page or directly from Tags page in ERC. Follow instruction in the ERC User
Guide for updating the firmware.
Note
If the Tag battery level is below 10 % (applicable on A4+ only if running on internal backup
battery) the FW update is not allowed. The corresponding error code in ERC is TU. To
update the firmware, please replace the battery and try again.
2.4 Optimizing Battery Life
The A4 / A4+ Wi-Fi tag uses an ultra-low power system-on-chip architecture that lowers the
power consumption to minimal. This enables running tags with same batteries for several years.
However, to get the maximum lifetime from your tags you should take care that your network and
tag configuration supports all possible power save features (does not concern A4+ when
powered from wall adapter).
The principal in optimizing battery life is to determine the maximum interval for location updates,
still sufficient for the use case, to minimize the amount of time the tag is active.