HD LINK V2 Fiber Optic Transmission Module FPV Digital Video System, 1080p HDMI x2, 0–80km, SBUS/CRSF

Overview

HD LINK V2 is a fiber optic transmission module (fiber-optic FPV digital video transmission system) designed for harsh electromagnetic interference (EMI) environments. By replacing traditional RF/wireless links with optical fiber, it provides high immunity to electromagnetic interference at the physical layer while transmitting drone control signals. It supports 1080p video, low latency, and a standard transmission range of 80 km.

Key Features

• Standard transmission range: 80 km
• Video latency: 15 ms (ultra-low)
• Dual HDMI output (feature text: 1920x1080@30fps)
• Full Betaflight OSD support
• JR module bay adapter support
• EMC-optimized design, non-interfering with GPS signals

Interfaces & Components

Air Unit Components (diagram labels)

• Camera
• MIPI coaxial cable
• Link status LED
• RC signal LED
• 3-in-1 interface
• Air unit main body
• Fiber optic port

Ground Unit Components (diagram labels)

• HDMI output 1
• HDMI output 2
• Link status LED
• RC signal LED
• DC power port
• Fiber optic port
• Receiver port
• JR bay port

Wiring & Setup

Air Unit Connection (3-in-1 port)

The 3-in-1 port integrates power supply, OSD output, and RC signal reception.

• SBUS mode: Plug the 3-in-1 cable directly into the flight controller’s “DJI” port (no soldering required).
• CRSF mode: Connect the TX wire (yellow) from the 3-in-1 cable to the flight controller’s RX pin.

3-in-1 cable pinout

• Pin1 (Yellow): Signal TX
• Pin2 (Brown): GND
• Pin3 (Green): UART TX → FC OSD RX (0–3.3 V)
• Pin4 (Blue): UART RX → FC OSD TX (0–3.3 V)
• Pin5 (Black): Power GND
• Pin6 (Red): Power (7–34 V)

Flight Controller OSD Set

Method 1: Betaflight Configurator (recommended)

Connect the video transmitter’s OSD serial port to the flight controller to obtain OSD information (example uses Betaflight Configurator 10.10.0 and firmware 4.5.0 for UART setup).

1. Connect the green (UART_TX) and blue (UART_RX) wires from the 6-pin 3-in-1 cable to the flight controller’s UART1 port (UART1 used as an example).
2. In Betaflight Configurator, open the Ports tab, select the corresponding UART port, enable MSP, and set VTX (MSP + Displayport).
3. On the Presets page, search for HD OSD and select it.
4. On the OSD page, configure the information to display.

Method 2: CLI Command Line Setup

1. Open the corresponding UART port (UART1 example), enable MSP, click Save, and set VTX (MSP + Displayport).
2. Open the CLI and enter:

set osd_displayport_device = MSP
set vcd_video_system = HD
save

Ground Unit Connection

• Method 1: ELRS Receiver — Connect the receiver signal wire to the receiver port and supply external power (enables wireless relay functionality to the transmitter).
• Method 2: JR Bay — Connect the JR cable from the transmitter to the JR bay port (auto-detects SBUS or CRSF). Note: For CRSF, set the transmitter baud rate to 400K.

Receiver port wires: TX, RX, 5VOUT, GND
JR Bay wires: CRSF, GND, VCC, NC, SBUS
DC power input (ground unit): 6–34V

Specifications

For integration questions (wiring, Betaflight OSD setup, or fiber interface selection), contact support@rcdrone.top or visit https://rcdrone.top/.

Details

Swap RF for optical fiber to keep 1080p video and RC control stable in high‑EMI environments, with up to 80 km standard range and ~15 ms latency.

The air unit’s 3‑in‑1 port combines power, Betaflight OSD serial, and RC signal input to simplify SBUS or CRSF wiring.

Betaflight setup uses MSP + Displayport to bring full OSD data into the HD video feed.