> For the complete documentation index, see [llms.txt](https://docs.sky-drones.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.sky-drones.com/avionics/smartlink/interfaces.md).

# Interfaces

This page describes general information and interface location for SmartLink Air and Ground modules.

## Air Module

### Top

Antenna SMA connectors

![](https://449459530-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MTMlWysgDtJq8Hid1v7%2Fsync%2Fbfb3d2aedd53de591a343e5d69caa3128b1818dc.jpg?generation=1613164694130792\&alt=media)

### Left

* 5V DC power input socket
* Reset button
* CSI camera Port
* USB for firmware upgrade
* SPI 0 / 1
* I2C 0 / 1
* UART 0 / 1 (console and autopilot telemetry)

![](https://449459530-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MTMlWysgDtJq8Hid1v7%2Fsync%2F92484b315840b78248bbbee084d31376d5bba01d.jpg?generation=1613164696104674\&alt=media)

{% hint style="info" %}
Pin numbers are referenced to MOLEX 53261-0671 connector pinout. 
{% endhint %}

#### SPI1 Connector pinout - MOLEX 53261-0671

<table><thead><tr><th width="150">Pin</th><th>Name</th></tr></thead><tbody><tr><td>1</td><td>5V OUT</td></tr><tr><td>2</td><td>SPI1 SCLK</td></tr><tr><td>3</td><td>SPI1 MISO</td></tr><tr><td>4</td><td>SPI1 MOSI</td></tr><tr><td>5</td><td>SPI1 CS0</td></tr><tr><td>6</td><td>GND</td></tr></tbody></table>

#### I2C Connector pinout - MOLEX 53261-0671

<table><thead><tr><th width="150">Pin</th><th>Name</th></tr></thead><tbody><tr><td>1</td><td>5V OUT</td></tr><tr><td>2</td><td>I2C1 SCL</td></tr><tr><td>3</td><td>I2C1 SDA</td></tr><tr><td>4</td><td>I2C2 SCL</td></tr><tr><td>5</td><td>I2C2 SDA</td></tr><tr><td>6</td><td>GND</td></tr></tbody></table>

#### UART Connector pinout - MOLEX 53261-0671

<table><thead><tr><th width="150">Pin</th><th>Name</th></tr></thead><tbody><tr><td>1</td><td>5V OUT</td></tr><tr><td>2</td><td>DBG RX</td></tr><tr><td>3</td><td>DBG TX</td></tr><tr><td>4</td><td>TEL RX</td></tr><tr><td>5</td><td>TEL TX</td></tr><tr><td>6</td><td>GND</td></tr></tbody></table>

#### SPI0 Connector pinout - MOLEX 53261-0671

<table><thead><tr><th width="150">Pin</th><th>Name</th></tr></thead><tbody><tr><td>1</td><td>5V OUT</td></tr><tr><td>2</td><td>SPI0 SCLK</td></tr><tr><td>3</td><td>SPI0 MISO</td></tr><tr><td>4</td><td>SPI0 MOSI</td></tr><tr><td>5</td><td>SPI0 CS0</td></tr><tr><td>6</td><td>GND</td></tr></tbody></table>

**TEL (Telemetry) port:** TTL 3V3, Baudrate 57600

**DBG (Debug) port:** TTL 3V3, Baudrate 9600

### Front

Front side has an integrated fan. It is important to have a clear space to allow for air flow circulation in front of this side.

![](https://449459530-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MTMlWysgDtJq8Hid1v7%2Fsync%2F06098ff3d77dd7b2f6a6203e192f97706eb475db.jpg?generation=1613164692117360\&alt=media)

### Right

* Mini HDMI input
* Micro SD card slot
* Camera status LEDs

![](https://449459530-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MTMlWysgDtJq8Hid1v7%2Fsync%2F50e880aff27864537e03bca15ea448318255ae7a.jpg?generation=1613164702200998\&alt=media)

### Rear

USB A connectors for peripherals connection, for instance:

* 4G / LTE modem
* Rockblock satellite communication system
* FLARM ADSB system

![](https://449459530-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MTMlWysgDtJq8Hid1v7%2F-MToXIb7kNu7wl4KdA-r%2F-MToYpgnETBHbmkM71gr%2Fsmartlink-air-rear-side.jpg?alt=media\&token=f676f24d-2527-4a35-ac66-8c2fa7219668)

### Bottom

![](https://449459530-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MTMlWysgDtJq8Hid1v7%2Fsync%2Fc7605dbd44e9e60d0e15aaa7e6943e5383e2c34f.jpg?generation=1613164695766261\&alt=media)

## Ground Module

### Top

The top side has an a heatsink and mounting holes for an optional fan. It's important to have a clear space to allow for airflow circulation in front of this side.&#x20;

<figure><img src="https://449459530-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MTMlWysgDtJq8Hid1v7%2Fuploads%2FGdlUTUb5XnltmV4kgKka%2F3.jpg?alt=media&amp;token=5b0441f3-6934-4e11-847b-9f9b1657716e" alt=""><figcaption></figcaption></figure>

### Left

<figure><img src="https://449459530-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MTMlWysgDtJq8Hid1v7%2Fuploads%2F5XICqRNuCoRcQA983KBR%2F7.jpg?alt=media&amp;token=eb2b8f25-ad4b-45db-bbb4-1e5920625e82" alt=""><figcaption></figcaption></figure>

### Front

SMA antenna connectors for antennas

Status LEDs:

* TX: blinking when packets are being transmitted
* RX: blinking when packets are being received
* CPU: module operating
* RSSI: signal quality

<figure><img src="https://449459530-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MTMlWysgDtJq8Hid1v7%2Fuploads%2FV4anJ7ndA3g674G026Co%2F6.jpg?alt=media&amp;token=6e2b3e82-e34f-4601-8409-09d6a4ef2ccc" alt=""><figcaption></figcaption></figure>

### Right

* Reset button
* Fan port

<figure><img src="https://449459530-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MTMlWysgDtJq8Hid1v7%2Fuploads%2FlmHdeCXZquTHsYWd2dAr%2F5.jpg?alt=media&amp;token=73142c0c-0eb1-418d-a710-008b57f1fd51" alt=""><figcaption></figcaption></figure>

### Rear

* USB to connect to computer / tablet
* Ethernet port (RJ45)
* Power supply, 7-35V DC
* Serial port

<figure><img src="https://449459530-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MTMlWysgDtJq8Hid1v7%2Fuploads%2FTNqld4JSOBZd0mFtpFDl%2F4.jpg?alt=media&amp;token=64ea14e2-5500-4986-8df8-ad603a8cf10d" alt=""><figcaption></figcaption></figure>

### Bottom

<figure><img src="https://449459530-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MTMlWysgDtJq8Hid1v7%2Fuploads%2FThg8I2DzU8Bv2tswOusy%2F8.jpg?alt=media&amp;token=7c88f45e-9ee5-44d9-b25d-09cdded824a6" alt=""><figcaption></figcaption></figure>

{% hint style="info" %}
Looking for CAD files? Here they are:
{% endhint %}

{% content-ref url="/pages/-MTQeiny65kIZfq2knvm" %}
[CAD Model](/avionics/smartlink/cad-model.md)
{% endcontent-ref %}