> For the complete documentation index, see [llms.txt](https://developer.magtek.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.magtek.com/hardware/card-readers/mms-dyna-devices/dynaflex-ii-go/documentation/user-manuals/installation-and-operation-manual/user-interface/bluetooth-r-low-energy-le-led-behavior.md).

# Bluetooth® Low Energy (LE) LED Behavior

## **Bluetooth® Low Energy (LE) Status LED 2 and LED 3**

LED 2 is designated for indicating Bluetooth® connection status, not USB connection status.

* When LED 2 is off, it indicates that the device is not currently connected via Bluetooth®. In most cases, this implies that the device has a Bluetooth® signal that is not connected, unless this has been intentionally disabled through configuration.
* When LED 2 is on, it indicates that the device is currently connected via Bluetooth®. LED 3 is designated for indicating readiness for Bluetooth® message exchange.
* When LED 3 is off, it indicates that the Bluetooth® connection is not yet ready. This could be due to the absence of a secure connection or the non-activation of device-to-host characteristic notifications.
* When LED 3 is on, it indicates that the Bluetooth® connection is ready, signaling the establishment of a secure connection and the activation of device-to-host characteristic notifications.

## **Power On DynaFlex II Go in Battery Operating Mode**

Press and hold the Power Button for two seconds: initially, LED 4 will light up, followed by all four LEDs illuminating for one second. This is followed by LEDs 1 and 2 remaining lit for 2 seconds, after which only LED 1 will be active.

<figure><img src="/files/fkQCLOWLfmMAkrY8XgZ5" alt=""><figcaption></figcaption></figure>

<p align="center"><strong>Figure - Power On in Battery Operating Mode</strong></p>

<figure><img src="/files/t3Zk8udUk9qDLsKussYe" alt=""><figcaption></figcaption></figure>

<p align="center"><strong>Figure - LED Behavior for Bluetooth® Low Energy (LE) Ready State</strong></p>

If the host is within the Bluetooth® Low Energy (LE) connection range, all three LEDs (LED 1, 2, 3) will be illuminated, as described in Figure 7-8 - LED Behavior for Bluetooth® Low Energy (LE) Ready State.

## **Power Off DynaFlex II Go in Battery Operating Mode**

DynaFlex II Go is capable of being powered off while in Battery Operating Mode only. To initiate the power-off sequence, press and hold the Power Button for two beeps then release. It's important to note that DynaFlex II Go cannot be powered off while connected via USB. If a two-beep sequence is initiated while connected to USB the device will reboot.

<figure><img src="/files/KdpLsVsRP3Geg8sDuTNC" alt=""><figcaption></figcaption></figure>

<p align="center"><strong>Figure - Power Off Device in Battery Operating Mode</strong></p>

## **DynaFlex II Go Bluetooth® Low Energy (LE) Host Pairing**

DynaFlex II Go must first be paired with the host device before a secure Bluetooth® connection can be established. Follow the steps below to activate Bluetooth® pairing mode:

* Press and Hold the Power Button for 4 beeps
* Release the Power Button
* LED 1 will remain steadily illuminated while LED 4 will begin to blink. When LED 4 is blinking it indicates the device is waiting to pair with the host. It will continue to blink for 3 minutes, waiting to pair with the host.

<figure><img src="/files/BQ61mQB7920NvvFoxGdf" alt=""><figcaption></figcaption></figure>

<p align="center"><strong>Figure - Activate BLE Pairing Mode</strong></p>

* When the host is pairing with DynaFlex II GO, LED 4 will remain off and LED 2 will power on, indicating the pair is processing.

<figure><img src="/files/bb9jrHXmkbgU0QxcJPkv" alt=""><figcaption></figcaption></figure>

<p align="center"><strong>Figure - Bluetooth® LE Pair Processing</strong></p>

* The device will return to Power On status if pairing Succeeds or Fails. LED 2 will power off and LED 1 will remain powered on.

<figure><img src="/files/1i4g4kIO18QQR48S55Wl" alt=""><figcaption></figcaption></figure>

<p align="center"><strong>Figure - Pairing Successful/Failed</strong></p>

## **DynaFlex II Go Bluetooth® Low Energy (LE) Host Connected**

When the device establishes a connection to the host via BLE and is prepared for secure communication, all three LEDs (LED 1, 2, 3) will illuminate steadily.

<figure><img src="/files/ujGf96jizULp27e92kAV" alt=""><figcaption></figcaption></figure>

<p align="center"><strong>Figure - BLE Connected to Host</strong></p>

## **DynaFlex II Go Bluetooth® Low Energy (LE) Host Disconnect**

When the device is disconnected from the host Bluetooth® Low Energy (LE) connection, LED 3 will power off first and after 4 seconds, LED 2 will power off, LED 1 will remain powered on as the device returns to Ready State.

<figure><img src="/files/y8ZiDLbnUvjboOc5smHC" alt=""><figcaption></figcaption></figure>

<p align="center"><strong>Figure 7-14 - Bluetooth® LE Disconnect LED Sequence</strong></p>

## **DynaFlex II Go Bluetooth® Low Energy (LE) Sleep Mode**

When in Bluetooth® LE Sleep Mode, DynaFlex II Go will conserve battery life by limiting power to non-essential hardware features and entering low power mode. When in Sleep Mode, the device will appear to be powered off, with no LEDs illuminated, see Figure 7-15 – Bluetooth® (LE) Sleep Mode. For information on how to disable this feature, see *D998200597 DynaFlex II Go Programmer’s Manual (COMMANDS).*

<figure><img src="/files/mfg6STH1BrikUGv7KRXT" alt=""><figcaption></figcaption></figure>

<p align="center"><strong>Figure – Bluetooth® (LE) Sleep Mode</strong></p>


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