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SBUS Servo Configuration Protocol
Posted: Sun Oct 07, 2018 5:14 am
by wilopaan
Hi all,
SBUS-servos can be configured, e.g. to listen to a specific SBUS-Channel, or other parameters.
In the SBUS-descriptions I've seen so far, I'm not aware of a specification for this kind of information.
I like to build my own SBUS-servo-programmer, but I can't find any info on this.
Thanks,
Wilhelm
Re: SBUS Servo Configuration Protocol
Posted: Mon Oct 08, 2018 12:02 am
by rdeanchurch
It seems to me the connection between a servo channel changer and a servo or SBus to PWM will have to be reversed engineered. I do have a FrSky Servo Channel Changer, but have not got around to building a sniffer to record traffic between it and a servo. Supposedly the FrSkY SBus is an implementation of the Futaba Spec.
I've not found a lot on this. But here is some of what I've found:
https://forum.arduino.cc/index.php?topic=99708.0
Re: SBUS Servo Configuration Protocol
Posted: Mon Oct 08, 2018 3:52 am
by wilopaan
Thanks Dean!
Sadly, the first document has nothing to do with the SBUS-called serial protocol in the RC world. Anyway, the second is useful.
But my problem is not SBUS at all - I'm using SBUS since long time.
I like to know how the servo programming works, because this must be an enrichment to the original SBUS protocol.
Thanks,
Wilhelm
Re: SBUS Servo Configuration Protocol
Posted: Mon Oct 08, 2018 7:11 pm
by rdeanchurch
Since the Channel Changer works by connecting the servo to the SBus, yes it is some variant of the SBus protocol. But I have not found any docs. on how it works. That is why I suggested a needed to have a sniffer/monitor that looks at what channel changer sends when first powered on, then what happens when a servo a SBus to PWM is connected. Since SBus allows parallel connection this should just be a passive monitor.
Sorry about the first document, I just found it and hoped it was a formal definition of SBus, I guess it was for the old Sun computers after the review of it.
Re: SBUS Servo Configuration Protocol
Posted: Thu Oct 11, 2018 6:22 pm
by michel49
I checked it don't work with Corona Sbus servos.
Re: SBUS Servo Configuration Protocol
Posted: Sat Feb 09, 2019 4:59 pm
by Voodoo
Any progress on this?
I can't find anything too.
Changing parameters by Servo Channel Changer would be a fantastic option fo my DIY SBUS project "SBUS-Switch".
http://rc-network.de/forum/showthread.p ... ost4538997
In my version 2, I can drive 8 switched ports over only 1 channel. It is possible to daisy chain two or more SBUS-Switch modules.
The limit are the maximum 64 mixers in openTX at the moment. (Each switched port needs one mixer)