Nordic ID EXA21 has one sensor (ToF) and two physical buttons for user interactions: Scan button and Power button. Location of the buttons and ToF sensor can be seen in picture below.
Power button
Quick press of power button turns reader On/Off when no host connection. The power button is disabled when Nordic ID EXA21 has an active connection with the host device. In that case, only key notifications will be sent to host.
Reader can be restored to factory defaults by keeping power button down at least 5 seconds when no active host connection.
Factory defaults:
- Pairing disabled.
- Secure passkey to default (6 last digits of serial number)
- RFID HID mode disabled
- ToF sensor disabled.
- ToF Range filter threshold values to default.
If the device is not responsive, hardware reset can be forced by pressing and keeping power button down until device reboots (~5 sec).
Scan button
The scan button is located at the top of the reader. It can be used to start/stop UHF RFID scanning. Depending on the application in use, the trigger button starts/stops UHF RFID reading. By default, the first press of the button starts the reading and the second press of the button stops it.
In firmware version 4.x.x on, the RFID HID mode can also be enabled/disabled using long pressing (5 seconds) the SCAN physical button while device is turned off.
• Change from normal mode to HID mode is indicated by blinking LED in blue. Pairing is automatically enabled in this mode.
• Change from HID mode to normal mode is indicated by blinking LED in green