SBUS Servo Configuration Protocol

Electronic projects that are either related to the firmwares for the 9x, or simply great for radio control applications.
Post Reply
wilopaan
Posts: 21
Joined: Sun Sep 09, 2018 6:09 pm
Country: -

SBUS Servo Configuration Protocol

Post by wilopaan » Sun Oct 07, 2018 5:14 am

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

rdeanchurch
Posts: 588
Joined: Tue Dec 27, 2011 11:22 pm
Country: -
Location: Rio Vista. CA

Re: SBUS Servo Configuration Protocol

Post by rdeanchurch » Mon Oct 08, 2018 12:02 am

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
Attachments
SBus_Specification_B.0_Dec9-0800-5922-10.pdf
(6.61 MiB) Downloaded 9 times
sbus.pdf
(190.53 KiB) Downloaded 9 times
Dean
OldDmbThms: 1. Takeoff, 2. Crash, 3. Repair, GOTO 1

wilopaan
Posts: 21
Joined: Sun Sep 09, 2018 6:09 pm
Country: -

Re: SBUS Servo Configuration Protocol

Post by wilopaan » Mon Oct 08, 2018 3:52 am

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

rdeanchurch
Posts: 588
Joined: Tue Dec 27, 2011 11:22 pm
Country: -
Location: Rio Vista. CA

Re: SBUS Servo Configuration Protocol

Post by rdeanchurch » Mon Oct 08, 2018 7:11 pm

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.
Dean
OldDmbThms: 1. Takeoff, 2. Crash, 3. Repair, GOTO 1

michel49
Posts: 117
Joined: Sun Oct 07, 2012 10:59 am
Country: -

Re: SBUS Servo Configuration Protocol

Post by michel49 » Thu Oct 11, 2018 6:22 pm

I checked it don't work with Corona Sbus servos.

Post Reply

Return to “General RC Electronic Projects and Discussion”