All, my first post here. Correct me I am in the wrong section I am not new to electronics, but new building my first hexacopter. Reading all I could for the last two months, and things start to materialize in my shack.
This not a question, which should lead to the well documented and over discussed “inverted, non inverted” issue.
My rough setup:
Pixhawk 4, Frsky RXSR (ACCESS, EU), Arducopter 3.6.11, QGC and Mission Planner.
Before I start my permanent wiring, I want everything to work on my desk and thoroughly tested. I cannot get any output from any of the Serial Ports when configured as FRSKY Telemetry passthrough. Forget the inverted/uninverted discussion, when not connected to the S.port of my RXSR, the Tx lead shows no activity. Configuring as MavLink2 gives me the regular databursts as output on my Tx pin. So my UARTS are OK. Juggled around with faking the RTS/CTS, waited, tried other serial ports, but no output whatsoever.
It makes me think there is some kind of prerequisite for this telemetry to kick in. A status of some kind (armed ? Which would be weird) before this data is sent out. Attached a snapshot of my poor mens’scope of Tx on Telem1 port, Tx. When configured as Frsky passtrhough, signal is clean, at 3.3V, with no data activity visible.
Any thoughts or hints ?