How to wire T-Motor F7 and Spektrum SRXL2

Michael Gauthier

Michael Gauthier

Member
I have a T-Motor F7 55a Pro II stack and a Spektrum SPM9747 SRXL2 receiver. I can't find a wiring diagram for how to connect these two together.
The SRXL2 receiver has 4 pins, Ground and 3.3v but I don't know what the other two wires are nor where to connect them on the F7.
 
If the SRXL2 receiver doesn't work, what about the Lemon DSM2 compatible receiver. 1670090891667.png

Where does that signal wire connect on the T-Motor F7?
 
Last edited:
Signal wire goes to Rx2
I found this it may help

T-Motor F7 Pro Full Function 30x30 Flight Controller with Wifi & Bluetooth - Flight Controllers - T-MOTOR The Safer Propulsion System

T-MOTOR is devoted to being the guiding star in UAV industry with “the Safer Propulsion System”. Technological innovation, win-win cooperation, integrity and service make T-MOTOR a reliable partner for drone manufacturer and distributors for long-term co
uav-en.tmotor.com

t motor F7 manual - Bing video

www.bing.com www.bing.com
 
No luck so far.

No matter what I do, I can’t get the receiver working in Betaflight. It is bound to the transmitter and the built-in LED does light up indicating a connection when the transmitter is turned on.

Some instructions/people say hook up the signal wire to Tx others say Rx, I have tried both with no success. The uart to use also varies depending on who you ask, so I have chosen T1/R1.

Any help will be appreciated!

RECEIVER:

I am using the Spektrum SPM9747 RSLX2 receiver. It works from 3v-8v. This is the wiring as I understand it, but I’m not sure. I also don’t know what baud rate to use, so I tried all of the Betaflight rates.
1670181358050.png


WIRING:
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BETAFLIGHT SETTINGS:

PORTS:
1670181431197.png
RECEIVER SETTINGS:
1670181457586.png
CLI SETTINGS:
feature -RSSI_ADC
feature RX_SERIAL
feature TELEMETRY
map TAER1234
set rssi_channel = 0
set serialrx_provider = SRXL2
set serialrx_inverted = OFF
set srxl2_unit_id = 1
set srxl2_baud_fast = ON
 
I have never used beta flight , spektrum have a good customer help desk give them a shout they should be able to help
 
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