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11. Buttons channel: corresponding to F1-F12, 12 buttons
12. Power indicators: 1 indicator stands for 25% battery capacity
13. Wireless link indicators: indicating signal strength; in the flow light state when no
connection
14. Transparent transmission data indicators: Tx light ON when there is data transmitting;
Rx light ON when there is data receiving.
15. Battery charging port: DC16.8V 6A input
16. Power supply output interface: DC12V 3A output
17. 6 Pin Aviation Plug: corresponding to RS232 Level, COM4, 2 channels of SBUS
18. 4 Pin Aviation Plug: corresponding to LAN port of the computer
19. SIM card slot: for installing SIM card
20. 3*RS232 serial port: corresponding to COM1, COM2, COM3.
21. External SBUS input: corresponding to SBUS2 signal output
22. Audio interface and LAN port: for audio output and Ethernet connection
23. USB, VGA, HDMI interfaces: used for SUB communication and video output
24. Antenna interface: corresponding to slave antenna
25. Antenna interface: corresponding to main antenna
5.2 V21 Receiver
5.2.1 V21 Receiver Indicator&Port Instruction
Front view
① Data receiving indicator: light will flicker in the condition of data receiving.