> For the complete documentation index, see [llms.txt](https://docs.xbstation.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.xbstation.com/xblink-duo/user-manual/getting-started/interfaces.md).

# Interfaces

This article will describe the Interfaces of XBLink Duo

## Interface Function Map

<figure><img src="https://752643261-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-M1Ot9F_Ob2Aboz1SKNK%2Fuploads%2Frfszv6Qs02QfqVExXtfb%2FDualcellKhacLazer02.jpg?alt=media&amp;token=6de5586c-db14-4244-b9a3-347e05eea335" alt=""><figcaption><p>XBLink Duo - Interfaces</p></figcaption></figure>

## Connectors

<table data-header-hidden><thead><tr><th width="141">ID</th><th>Name</th><th>Connector</th><th width="199">Description</th></tr></thead><tbody><tr><td><strong>ID</strong></td><td><strong>Name</strong></td><td><strong>Connector</strong></td><td><strong>Description</strong></td></tr><tr><td>J1</td><td>USB</td><td>USB Type-C</td><td>External Hardware (Coral AI, Payload, Microhand, Ethernet...)</td></tr><tr><td>J2</td><td>USB</td><td>USB Type-C</td><td>External Hardware (Coral AI, Payload, Microhand, Ethernet...)</td></tr><tr><td>J3</td><td>EXT</td><td>USB Type-C</td><td>External Cell</td></tr><tr><td>J4</td><td>COM1</td><td>JST GH 6pin</td><td>Connect Flight Controller telemetry</td></tr><tr><td>J5</td><td>COM2</td><td>JST GH 3pin</td><td>Extend payload</td></tr><tr><td>J6</td><td>SATCOM</td><td>JST GH 5pin</td><td>Ethernet 100 Base-T connect to Starlink</td></tr><tr><td>J7</td><td>ETH1</td><td>JST GH 5pin</td><td>Gimbal/ Extend payload</td></tr><tr><td>J8</td><td>UPGR1</td><td>Micro USB</td><td>System Firmware Upgrade</td></tr><tr><td>J9</td><td>UPGR2</td><td>Micro USB</td><td>Network Firmware Upgrade</td></tr><tr><td>J10</td><td>Power</td><td>Micro-Lock Plus 4pin</td><td>Power Input</td></tr></tbody></table>

## Pinout

#### COM1 (J4)

| **Pin** | **Description**          |
| ------- | ------------------------ |
| 1       | VBUS 5V 2A               |
| 2       | UART1\_RX (ttyS0)        |
| 3       | UART1\_TX (ttyS0)        |
| 4       | UART2\_RX (AMA4 or AMA5) |
| 5       | UART2\_TX (AMA4 or AMA5) |
| 6       | GND                      |

#### COM2

| **Pin** | **Description**     |
| ------- | ------------------- |
| 1       | UART2\_RX (ttyAMA4) |
| 2       | UART2\_TX (ttyAMA4) |
| 3       | GND                 |

#### SATCOM - Ethernet 100 Base-T

| **Pin** | **Description** | **Item** |
| ------- | --------------- | -------- |
| 1       | TRD0\_P         | TX+      |
| 2       | TRD0\_N         | TX-      |
| 3       | Ground pin6     | GND      |
| 4       | TRD0\_P         | RX+      |
| 5       | TRD0\_N         | RX-      |

**Note:** An Ethernet standard that transmits at 100 Mbps.

#### ETH1

| **Pin** | **Description** | **Item** |
| ------- | --------------- | -------- |
| 1       | TRD0\_P         | TX+      |
| 2       | TRD0\_N         | TX-      |
| 3       | Ground pin6     | GND      |
| 4       | TRD0\_P         | RX+      |
| 5       | TRD0\_N         | RX-      |

#### Power

| **Pin** | **Description** |
| ------- | --------------- |
| 1       | GND             |
| 2       | GND             |
| 3       | 7-30V Input     |
| 4       | 7-30V Input     |