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Number of async serial ports on Pixhawk3 Pro?

PIXHAWK 3 PRO
#1

Can you confirm the number of serial ports the Pixhawk 3 provides ?

This https://pixhawk.drotek.com/en/introduction.html documentation contradicts itself. It says:

“6 general purpose serial ports, 2 with full flow control, 1 with separate 1A current limit, 1 with FrSky protocol inverter.”

and

“Five serial ports are provided. TELEM 1, 2 and 3 feature full flow control. TELEM4 can be switched into inverted mode by hardware and has no flow control. Serial ports are 3.3V CMOS logic level, 5V tolerant, buffered and ESDprotected.”

Examination of the device pinout suggests 7 serial ports, see attached image.

Can you explain ?

Can you provide the schematic so I may confirm myself ? !

PixHawk3_Serial_Ports
PixHawk3_Serial_Ports.jpg745×626 63.6 KB

#2

Actually, the WIFI connector shares the same serial port than TELEM 3. There are 5 serial ports on the FMU proc.

#3

So this is 5 serial ports not counting the debug port ?

#4

Actually there are 6 serial ports if we count the serial debug.

#5

Great, thanks for clearing that up.

#6

Which port is the one with the “FrSky protocoll inverter”? And how do I connect it to a FrSky-receiver (X8R with Smart-port)?

#7

That is still a bit confusing for me …
Can you confirm the correspondence between physical connectors and serial ports in ArduCopter ?

TELEM 1 - > SERIAL1
TELEM 2 - > SERIAL2
GPS - > ?
TELEM 3/4 (+Wifi) - > SERIAL3
TELEM 3/4 - > SERIAL4
FMU DEBUG - > ?