Matek H743 Mini v3 - More than 2 Telem ports?

Hardware Other Hardware
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1

Hello all,

TL;DR - Fried my TX7 RX7 (Telem1) Can I turn TX4 RX4 (Serial6) into another Telemetry (say, Telem3) port on the Matek H743 Mini?

I have been experimenting with building my own quad with a companion computer (RPi5), and so far I have been successful in building one which flies fairly well with Mission Planner, but I have another partially built, where I fried a Raspberry Pi by overloading my buck converter (oops), the Pi subsequently fried the connected TX7 RX7 port on the H743-mini (TX7 trace shorted to ground) and so I no longer have a MavLink connection with MP over this port, TX1 RX1 works fine, but this leads me to another issue I have been scratching my head over.

I have a TBS Crossfire nano, a Siyi A8 Mini, and the Pi 5 which I would like to each have its own telem port, I have previously been able to configure the Pi and the Siyi, the Crossfire and the Pi, Crossfire and Siyi as pairs, but I have never been able to connect all 3 to the mini. Is there any way I can configure, say, TX4 RX4 as a full telem port so that I can use all 3? Or at least salvage it so that I can bypass TX1 RX1 and use another UART port as a telem port?

I’m still a bit new to hobby drone building and still learning, the mateksys website says USER next to TX4 RX4 UART which led me to believe it might be configurable but I have not been successful so far with my attempts.

I had another idea to just do a multi-wire breakout over TX1 RX1 and connect two devices to a single port, but my intuition tells me this probably won’t work, correct me if I’m wrong.

Here’s the website for my FC:
https://www.mateksys.com/?portfolio=h743-mini#tab-id-5

I have flashed Copter 4.5.5 as of this morning if that’s relevant

Thanks in advance for any assistance!

-GM

2

you can use any serial port for any function with the limit of a maximum of 4 mavlink ports.

4

Thanks for the quick reply!
I have tried configuring TX4 RX4 for this function but any MavLink connection I add even with the correct Baud and Function settings gives me nothing back, do you think it’s a params issue? Is it too much to ask for you to provide an example?

For example if I am connecting to the Pi I just use MavLink 2 and 57600 baud, which normally works for the “designated” telem ports, but doesn’t work for TX4 RX4

5

by default you dont get anything from a mavlink port unless you request it or manually set the SR* parameters for your port.

6

hey man did you get the current sensor to work?