You can use Telemetry 1 or 2 of pixhawk for connection with XBLink. Telemetry 1 is normally used for Telemetry Radio (like: RFD900...) and Telemetry 2 for XBLink.
Note: Config baudrate of Pixhawk to 57600, SERIAL1_BAUD (Default 57, it means 57600), SERIAL1_PROTOCOL: 2 (MAVLink 2)
Note: For another payload via CSI or HDMI, please conntact us
XBLink supports 7-16V voltage input. You can directly connect 3 S battery to power XBLink (6S battery is inefficient and unstable with long-term use)
Note: Please use 3S battery or 12V DC Ubec (minimum 3A) for high effective and stable performance power supply to XBLink. If you use 6S high discharge battery for drone, we are not responsible for damage.
Please check carefully, avoid wrong between Power Port and UART Port (also use for Cooling Fan), both is JST-GH 4 Pin. We are not responsible for this confusion.