> For the complete documentation index, see [llms.txt](https://www.multi-module.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.multi-module.org/using-the-module/protocol-details/hitec.md).

# Hitec

## Details

**Protocol Number:**  39\
**Autobind:**  No\
**Channel Re-mapping:**  No\
**Extended Limits:**  Yes\
**Failsafe Support:**  No\
**Receiver Match:**  No\
**Telemetry:**  Yes\
**Option Value:**  Frequency fine tuning

{% hint style="danger" %}
Frequency tuning is required for this protocol.  See the [Frequency Tuning page](/using-the-module/frequency-tuning.md) for more details.
{% endhint %}

## Notes

{% hint style="success" %}
The radio must be close to the receiver for binding to complete successfully.
{% endhint %}

## Channel Assignment

| CH1 | CH2 | CH3 | CH4 | CH5 | CH6 | CH7 | CH8 | CH9 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| CH1 | CH2 | CH3 | CH4 | CH5 | CH6 | CH7 | CH8 | CH9 |

## Sub Protocols

### 0 - OPT\_FW

**Models:** Optima receivers

Full telemetry available on OpenTX 2.3.3+; still in progress for erskyTx. 

Lower TX\_LQI values indicate better link quality. TX\_LQI is a good indicator of how well the module is tuned.

### 1 - OPT\_HUB

**Models:** Optima receivers

Basic telemetry using FrSky Hub on er9x, erskyTX, OpenTX and any radio with FrSky telemetry support.

* Receiver voltage
* VOLT2 voltage
* TX\_RSSI
* TX\_LQI

Lower TX\_LQI values indicate better link quality. TX\_LQI is a good indicator of how well the module is tuned.

### 2 - Minima

**Models:** Minima, Micro and Red receivers