X series reciever, 4 pin header pinout ID

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interestingfellow
Posts: 197
Joined: Tue Jun 16, 2015 2:05 am
Country: United States
Location: durham, nc

X series reciever, 4 pin header pinout ID

Post by interestingfellow » Wed Jul 18, 2018 1:32 pm

Long story short:
There is a 4 pin header on most frsky X series receivers.
I have found this article] on Oscar Liang that ID's 3 of the pins on the X4R (the article is intended for finding the uninverted s.bus signal)

I am trying to figure out what the 3rd unidentified pad/via is for (perhaps uninverted s.port?)
Is that VCC for input? or output? What voltage level?
And is that 4 pin header the same use/pinout on all X series receivers that have it?

My goal is to interface my xsr to a Brain2 heli gyro without using an inverter cable, and then curiosity kicked in, too.

ORC is giving me an HTTP error when I try to upload photos, here are the links to pics that help (from Oscar's page, linked above)
Image
Image


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Kilrah
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Re: X series reciever, 4 pin header pinout ID

Post by Kilrah » Wed Jul 18, 2018 5:29 pm

The connector is the factory programming header. Function is not the same on all receivers as they use different processors with different programming interfaces. It just happens that on some the serial port used to communicate with the built-in bootloader is the same as the one used for SBUS. There is no other user function on there.

interestingfellow
Posts: 197
Joined: Tue Jun 16, 2015 2:05 am
Country: United States
Location: durham, nc

Re: X series reciever, 4 pin header pinout ID

Post by interestingfellow » Wed Jul 18, 2018 5:32 pm

Great info! Thank you!


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