# FlySky AFHDS 2A

## Details

**Protocol Number:**  28\
**Autobind:**  No\
**Channel Re-mapping:**  Yes\
**Extended Limits:**  Yes\
**Failsafe Support:**  Yes\
**Receiver Match:**  Yes\
**Telemetry:**  Yes\
**Option Value:**  Servo refresh rate. A value of 0 gives 50Hz (min), 70 gives 400Hz (max). Specific refresh rate value can be calculated as $$option=(refreshrate-50) \div 5$$

## Notes

**Models:** FS-iA6B, FS-iA10B, etc.

{% hint style="success" %}
FlySky AFHDS 2A is labelled **FlSky 2A** in OpenTX.
{% endhint %}

{% hint style="warning" %}
You **must** use a different **Receiver Number** for each different AFHDS 2A receiver you bind.  Re-using numbers will remove the binding for the previous receiver.
{% endhint %}

{% hint style="info" %}
A maximum of 64 AFHDS 2A receivers can be bound to the MULTI-Module.
{% endhint %}

### Telemetry

If telemetry data is incomplete (for example, missing receiver RSSI) you need to upgrade your RX firmware to version 1.6 or later.  You can do it from an original FlySky radio, or using an ST-Link programmer, as explained in [this tutorial](https://www.rcgroups.com/forums/showthread.php?2677694-How-to-upgrade-Flysky-Turnigy-iA6B-RX-to-firmware-1-6-with-a-ST-Link).

Suggested OpenTX RSSI alarm threshold settings:

| OpenTX Version  | Low Threshold | Critical Threshold |
| --------------- | ------------- | ------------------ |
| Prior to 2.3.0  | 15            | 12                 |
| 2.3.0 and later | 70            | 50                 |

## Channel Assignment

| CH1 | CH2 | CH3 | CH4 | CH5 | CH6 | CH7 | CH8 | CH9 | CH10 | CH11 | CH12 | CH13 | CH14 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | ---- | ---- | ---- | ---- | ---- |
| A   | E   | T   | R   | CH5 | CH6 | CH7 | CH8 | CH9 | CH10 | CH11 | CH12 | CH13 | CH14 |

## Sub Protocols

### 0 - PWM\_IBUS

### 1 - PPM\_IBUS

### 2 - PWM\_SBUS

### 3 - PPM\_SBUS

### 4 - PWM\_IBUS16

3 additional channels. Need recent or updated RXs.

| CH15 | CH16 | CH17 |
| ---- | ---- | ---- |
| CH15 | CH16 | LQI  |

**LQI:**  Link Quality Indicator

### 5 - PPM\_IBUS16

3 additional channels. Need recent or updated RXs.

| CH15 | CH16 | CH17 |
| ---- | ---- | ---- |
| CH15 | CH16 | LQI  |

**LQI:**  Link Quality Indicator


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