Futaba make "surprise" and probably changed sbus protocol (and add sbus2).
Together with VIM we make some test. On VIM's working setup new RX can't work.
I done some more test and some reserch on osciloscope.
General information:
- tested sbus output (NOT SBUS2)
- frame time 14ms
- sbus working
See video:
Test circuits and connections:
Here is few oscilograms:
- r7008 14ch mode, with inverter on UCY7404 (oldschool UNITRA (Polish manufacture) ttl neg gate ;) ) my best :)
My microinverter:
Compare inverted and non inverted signal (microinverter works fine):
I read some aboute this RX and ... other users have similar problems on sbus heli stuff:
http://www.helifreak.com/showthread.php?t=460873
I think Futaba make some changes in sbus protocol. Bill, could you make changes in AQ ? I think the best solution would be add for example "futaba test" radio option.
R7008sb is a new RX but it will be popular. (Futaba add this rx to new 14sg, 14mz and 18mz TX set systems).