> For the complete documentation index, see [llms.txt](https://docs.holybro.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.holybro.com/autopilot/pixhawk-6c/pixhawk-6c-ports.md).
# Pixhawk 6C Ports
{% hint style="info" %}
* I/O PWM OUT = MAIN OUT
* FMU PWM OUT = AUX OUT
Pin 1 starts from the flight controllers "right side" like diagram below
{% endhint %}
### **Power1 & 2**
| **Pin** | **Signal** | **Voltage** |
| -------- | ------------------ | ----------- |
| 1(red) | VDD5V\_BRICK1 (in) | +5V |
| 2(black) | VDD5V\_BRICK1 (in) | +5V |
| 3(black) | CURRENT1 | +3.3V |
| 4(black) | VOLTAGE1 | +3.3V |
| 5(black) | GND | GND |
| 6(black) | GND | GND |
### **Telem 1 Port**
| **Pin** | **Signal** | **Voltage** |
| -------- | --------------- | ----------- |
| 1(red) | VCC | +5V |
| 2(black) | UART7\_TX(out) | +3.3V |
| 3(black) | UART7\_RX(in) | +3.3V |
| 4(black) | UART7\_CTS(in) | +3.3V |
| 5(black) | UART7\_RTS(out) | +3.3V |
| 6(black) | GND | GND |
### **Telem 2 Port**
| **Pin** | **Signal** | **Voltage** |
| -------- | --------------- | ----------- |
| 1(red) | VCC | +5V |
| 2(black) | UART5\_TX(out) | +3.3V |
| 3(black) | UART5\_RX(in) | +3.3V |
| 4(black) | UART5\_CTS(in) | +3.3V |
| 5(black) | UART5\_RTS(out) | +3.3V |
| 6(black) | GND | GND |
### **Telem 3 Port**
| **Pin** | **Signal** | **Voltage** |
| -------- | --------------- | ----------- |
| 1(red) | VCC | +5V |
| 2(black) | USART2\_TX(out) | +3.3V |
| 3(black) | USART2\_RX(in) | +3.3V |
| 4(black) | NOT CONNECTED\* | - |
| 5(black) | NOT CONNECTED\* | - |
| 6(black) | GND | GND |
{% hint style="warning" %}
**\* For Pixhawk 6C with SN number *****`XXXX 001 XXXXXX`*** **(SN can be found on the packaging), Telem3 port is connected as follow:**
* pin 4 -> I2C4\_SCL (3.3V)
* pin 5 -> I2C4\_SDA (3.3V)
**Do not connect Non-I2C device (such as telemetry radio) to telem3 pin 4 & 5 if you have this version.**
{% endhint %}
### **GPS 1 Port**
| **Pin** | **Signal** | **Voltage** |
| --------- | ------------------- | ----------- |
| 1(red) | VCC | +5V |
| 2 black) | TX1(out) | +3.3V |
| 3(black) | RX1(in) | +3.3V |
| 4(black) | SCL1 | +3.3V |
| 5(black) | SDA1 | +3.3V |
| 6(black) | SAFETY\_SWITCH | +3.3V |
| 7(black) | SAFETY\_SWITCH\_LED | +3.3V |
| 8(black) | IO\_VDD\_3V3 | +3.3V |
| 9(black) | BUZZER- | 0\~5V |
| 10(black) | GND | GND |
### **GPS2 Port**
| **Pin** | **Signal** | **Voltage** |
| -------- | -------------- | ----------- |
| 1(red) | VCC | +5V |
| 2 black) | UART8\_TX(out) | +3.3V |
| 3(black) | UART8\_RX(in) | +3.3V |
| 4(black) | I2C2\_SCL | +3.3V |
| 5(black) | I2C2\_SDA | +3.3V |
| 6(black) | GND | GND |
### **USB Port**
| **Pin** | **Signal** | **Voltage** |
| -------- | ---------- | ----------- |
| 1(red) | VBUS | +5V |
| 2(black) | DM | +3.3V |
| 3(black) | DP | +3.3V |
| 4(black) | GND | GND |
### **I2C Port**
| **Pin** | **Signal** | **Voltage** |
| -------- | ----------- | ----------- |
| 1(red) | VCC | +5V |
| 2(black) | I2C2\_SCL\* | +3.3V |
| 3(black) | I2C2\_SDA\* | +3.3V |
| 4(black) | GND | GND |
{% hint style="warning" %}
**\* For Pixhawk 6C with SN number *****`XXXX XXX 20221100`*** **AND prior****,** **(SN can be found on the packaging), I2C port is connected as follow:**
* pin 2 -> I2C4\_SCL (3.3V)
* pin 3 -> I2C4\_SDA (3.3V)
{% endhint %}
### **CAN1 & CAN2 Port**
| **Pin** | **Signal** | **Voltage** |
| -------- | ---------- | ----------- |
| 1(red) | VCC | +5V |
| 2(black) | CAN1\_H | +3.3V |
| 3(black) | CAN1\_L | +3.3V |
| 4(black) | GND | GND |
### **DSM RC Port** (JST-ZH 1.5mm)
| **Pin** | **Signal** | **Voltage** |
| --------- | ------------------ | ----------- |
| 1(yellow) | VDD\_3V3\_SPEKTRUM | +3.3V |
| 2(black) | GND | GND |
| 3(gray) | DSM/SPEKTRUM IN | +3.3V |
### **PPM/SBUS RC port**
| **Pin** | **Signal** | **Voltage** |
| --------- | ------------------ | ----------- |
| 1(null) | VDD\_5V\_PPM\_SBUS | +5V |
| 2(yellow) | PPM\&SBUS\_IN | +3.3V |
| 3(null) | RSSI\_IN | +3.3V |
| 4(red) | (NOT CONNECTED) | -- |
| 5(black) | GND | GND |
### **SBus Out Port**
| **Pin** | **Signal** | **Voltage** |
| --------- | --------------- | ----------- |
| 1(red) | (NOT CONNECTED) | -- |
| 2(yellow) | SBUS\_OUT | +3.3V |
| 3(black) | GND | GND |
### **FMU PWM OUT (AUX OUT)**
| Pin | Signal | Voltage |
| --------- | ---------- | ------- |
| 1 (Red) | VDD\_Servo | |
| 2 (Black) | FMU\_CH1 | +3.3V |
| 3 (Black) | FMU\_CH2 | +3.3V |
| 4 (Black) | FMU\_CH3 | +3.3V |
| 5 (Black) | FMU\_CH4 | +3.3V |
| 6 (Black) | FMU\_CH5 | +3.3V |
| 7 (Black) | FMU\_CH6 | +3.3V |
| 8 (Black) | FMU\_CH7 | +3.3V |
| 9 (Black) | FMU\_CH8 | +3.3V |
| 10(Black) | GND | GND |
### **I/O PWM OUT (MAIN OUT)**
| Pin | Signal | Voltage |
| --------- | ---------- | ------- |
| 1 (Red) | VDD\_Servo | |
| 2 (Black) | IO\_CH1 | +3.3V |
| 3 (Black) | IO\_CH2 | +3.3V |
| 4 (Black) | IO\_CH3 | +3.3V |
| 5 (Black) | IO\_CH4 | +3.3V |
| 6 (Black) | IO\_CH5 | +3.3V |
| 7 (Black) | IO\_CH6 | +3.3V |
| 8 (Black) | IO\_CH7 | +3.3V |
| 9 (Black) | IO\_CH8 | +3.3V |
| 10(Black) | GND | GND |
### **FMU Debug Port** (JST SH 1mm Pitch)
| Pin | Signal | Voltage |
| --------- | -------------------- | ------- |
| 1(red) | FMU\_VDD\_3V3 | +3.3V |
| 2 black) | FMU\_USART3\_TX | +3.3V |
| 3(black) | FMU\_USART3\_RX | +3.3V |
| 4(black) | FMU\_SWD\_IO | +3.3V |
| 5(black) | FMU\_SWD\_CK | +3.3V |
| 6(black) | SPI6\_SCK\_EXTERNAL1 | +3.3V |
| 7(black) | NFC\_GPIO | +3.3V |
| 8(black) | PH11 | +3.3V |
| 9(black) | FMU\_nRST | +3.3V |
| 10(black) | GND | GND |
### **I/O Debug Port** (JST SH 1mm Pitch)
| Pin | Signal | Voltage |
| --------- | ---------------- | ------- |
| 1(red) | IO\_VDD\_3V3 | +3.3V |
| 2 black) | IO\_USART1\_TX | +3.3V |
| 3(black) | (NOT CONNECTED) | -- |
| 4(black) | IO\_SWD\_IO | +3.3V |
| 5(black) | IO\_SWD\_CK | +3.3V |
| 6(black) | IO\_SWO | +3.3V |
| 7(black) | IO\_SPARE\_GPIO1 | +3.3V |
| 8(black) | IO\_SPARE\_GPIO2 | +3.3V |
| 9(black) | IO\_nRST | +3.3V |
| 10(black) | GND | GND |
---
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