Nordic ID Group | Joensuunkatu 7 | FI-24100 Salo |FinlandOffice +358 2 727 7700 | Fax + 358 2 727 7720 | info@nordicid.com9 / 162019-04-02Nordic ID EXA21 User GuideVersion 1.0NOTE! The unpairing function is disabled when the Nordic ID EXA21has an active Bluetooth connection with host deviceUNPAIR A BLUETOOTH DEVICEIf Nordic ID EXA21 is paired to the host device, it stores information about the paired devices and triesto connect automatically when turned on. Unpairing process clears the paired device from the memoryof Nordic ID EXA21.Unpairing:• Make sure device is disconnected.• Press and keep “Power” and “Scan” buttons down at least 3 second.• When device beeps three times, pairing is cleared. Device may reboot.1.9. USING THE READERBUTTONSNordic ID EXA21 has one sensor (ToF) and two physical buttons for user interactions: Scan button andPower button. Location of the buttons and ToF sensor can be seen in Picture 4.Picture 4 Location of the buttonsScanning of RFID tags can be triggered using the Scan button or the ToF sensor, which allows twodifferent behaviours for different uses cases:• Scan button: the behaviour is push one’s to trigger the scanning and second push to stop it.• ToF sensor: the behaviour is scanning as long as it’s triggered.1.9.1.1. SCAN BUTTON