I discovered that there are three distinct pieces of software in the echo that needed updating. Turns out I had only updated one of them previously.
That got me traffic and wx on the Hxr!
The other learning is that when the echo software on my phone says “device updated”, it may well be lying. Turning on airplane mode to disable cellular data may help reduce this problem.
Now if I reconfigure to use transponder monitor, and set com1 to gdl 90 tx/wx, I do in fact get everything working — at least when the transponder is replying.
Configured as noted in my prior attachments, though, still no baro or squak code coming over serial through the mux.
I checked the inputs to the mux and saw valid altitude data (ALT 00153) on the serial port from the Hxr. I saw data (not recognizable text, but repeating patterns of symbols) on the serial port from the GTX327 as well.
Out of the mux, while not connected to the echo I saw only a series of about 10 uAW sequences at startup, then nothing.
Anybody able to give me sny guidance on the GTX327 Remote data format so I can conclusively establish its output is correct? Baud/parity? Expected data structure?
It sure seems like the mux just isn’t outputting the combined data stream, but I’ve tried two others at this point. Am I that unlucky?
I’d consider building my own mux if I had the gtx327 data format and knew what the echo needed to see out the other side!