Pinout

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1. Serial Port Summary

UART	Function	Connector
UART1	TELEM1	TELEM1, 4-pin
UART2	VTX	VTX, 6-pin — and the UART2 port, 4-pin (same signal)
UART3	GPS	GPS, 6-pin
UART4	TELEM2	TELEM2, 4-pin
UART6	RC Input	SBUS-CRSF, 4-pin
UART7	ESC Telemetry (RX only)	PWM1, pin 7
UART8	TELEM3	TELEM3, 4-pin

2. TELEM1 — 4-pin (UART1)

Pin	Signal	Voltage/Signal	Wire
1	GND	GND	Black
2	5V	+5V	Red
3	RX1	3.3V (logic)	Black
4	TX1	3.3V (logic)	Black

3. UART2 — 4-pin

Pin	Signal	Voltage/Signal	Wire
1	GND	GND	Black
2	5V	+5V	Red
3	TX2	3.3V (logic)	Black
4	RX2	3.3V (logic)	Black

⚠ This port carries the same UART2 signal as the VTX connector. Do not use both at the same time — this causes a bus conflict.

4. VTX — 6-pin (UART2 + SBUS)

Pin	Signal	Voltage/Signal	Wire
1	9V	+9V	Red
2	GND	GND	Black
3	TX2	3.3V (logic)	Black
4	RX2	3.3V (logic)	Black
5	GND	GND	Black
6	SBUS	3.3V (logic)	Black

⚠ Shares UART2 with the 4-pin UART2 port — use only one at a time. Pin 1 supplies 9V, not 5V.

5. GPS — 6-pin (UART3 + I2C1)

Pin	Signal	Voltage/Signal	Wire
1	GND	GND	Black
2	5V	+5V	Red
3	TX3	3.3V (logic)	Black
4	RX3	3.3V (logic)	Black
5	SCL1	3.3V (logic)	Black
6	SDA1	3.3V (logic)	Black

6. TELEM2 — 4-pin (UART4)

Pin	Signal	Voltage/Signal	Wire
1	GND	GND	Black
2	5V	+5V	Red
3	TX4	3.3V (logic)	Black
4	RX4	3.3V (logic)	Black

7. RC Input — 4-pin (UART6)

Pin	Signal	Voltage/Signal	Wire
1	GND	GND	Black
2	5V	+5V	Red
3	TX6	3.3V (logic)	Black
4	RX6	3.3V (logic)	Black

8. TELEM3 — 4-pin (UART8)

Pin	Signal	Voltage/Signal	Wire
1	GND	GND	Black
2	5V	+5V	Red
3	TX8	3.3V (logic)	Black
4	RX8	3.3V (logic)	Black

9. CAN

Pin	Signal	Voltage/Signal	Wire
1	CANL	3.3V	Black
2	CANH	3.3V	Black
3	GND	GND	Black
4	5V	+5V	Red

10. I2C (external) - 4-pin

Pin	Signal	Voltage/Signal	Wire
1	SDA1	3.3V (logic)	Black
2	SCL1	3.3V (logic)	Black
3	GND	GND	Black
4	5V	+5V	Red

11. VIDEO IN - 3-pin

Pin	Signal	Voltage/Signal	Wire
1	9V	+9V	Red
2	GND	GND	Black
3	VIDEO IN	analog video	Black

12. VIDEO OUT - 3-pin

Pin	Signal	Voltage/Signal	Wire
1	9V	+9V	Red
2	GND	GND	Black
3	VIDEO OUT	analog video	Black

13. SWD (Debug port) - 4-pin

Pin	Signal	Voltage/Signal	Wire
1	5V	+5V	Red
2	GND	GND	Black
3	SWDIO	3.3V (logic)	Black
4	SWCLK	3.3V (logic)	Black

14. Motor / Servo Outputs — PWM1 + POWER

Pin	Signal	Voltage/Signal	Wire
1	GND	GND	Black
2	VBAT	3S–6S	Red
3	M1	3.3V (logic)	Black
4	M2	3.3V (logic)	Black
5	M3	3.3V (logic)	Black
6	M4	3.3V (logic)	Black
7	RX7 (UART7, ESC Telemetry — RX only)	3.3V (logic)	Black
8	Current Sense	0–3.3V analog	Black

⚠ Pin 7 (RX7 / UART7) is RX only — it receives ESC telemetry and cannot transmit.

15. Motor / Servo Outputs — PWM2 + POWER

Pin	Signal	Voltage/Signal	Wire
1	GND	GND	Black
2	VBAT	3S–6S	Red
3	M5	3.3V (logic)	Black
4	M6	3.3V (logic)	Black
5	M7	3.3V (logic)	Black
6	M8	3.3V (logic)	Black
7	M9	3.3V (logic)	Black
8	M10	3.3V (logic)	Black

⚠ Pin 2 on both connectors is raw battery voltage (VBAT), NOT a regulated 5V rail.

16. PWM Timer Grouping & DShot

Group	Motors	Timer
1	M1–M4	TIM1
2	M5–M6	TIM3
3	M7–M10	TIM4

17. Battery Monitor (ArduPilot)

Parameter	Value
BATT_MONITOR	4
BATT_VOLT_MULT	11.0

Verify BATT_VOLT_MULT against a multimeter and fine-tune if needed. BATT_AMP_PERVLT depends on your ESC or power module, not on the flight controller.

General Usage Notes

RC Input Setup
- For ArduPilot, set SERIALn_PROTOCOL = 23 on the UART connected to your receiver (RC Input / SBUS-CRSF connector, UART6).
OSD
- Analog OSD: the onboard AT7456E chip overlays the OSD directly on the analog video signal (ArduPilot: OSD_TYPE = 1, MAX7456-compatible).
- Digital OSD: the board also supports MSP DisplayPort for HD digital video systems, where the OSD is rendered by the goggles instead of the onboard chip (ArduPilot: OSD_TYPE = 5 and SERIALn_PROTOCOL = 42 on the UART connected to the air unit).
Power Warning
- The VTX, VIDEO IN and VIDEO OUT connectors supply 9V. All other connectors supply 5V.
- Do not connect a 5V-only device to a 9V pin — check your accessory`s voltage rating before connecting.
External Compass
- An external magnetometer can be connected via the I2C1 connector, or via the I2C1 pins on the GPS connector (same bus).

Specifications

Detailed Documentation