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HelicopterRadio - Futaba FASST › S.Bus and VBar or any S.Bus compatible Gyro
08-29-2012 11:41 PM  5 years agoPost 1
S.Ratha

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Phnom Penh

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Is the s.bus the receiver or the Vbar unit the receiver?

I am using it, but I have no idea how it works.
My best guess is that the S.Bus is sending/receiving signal via Fasst (for Spek, it uses DSMX etc) signals which sends to the VBar which acts as a 'receiver' that sends signals to the servos.

Vs conventional receivers which sends and receives signal from the tx to the Rx, rx to Vbar to servos.

I don't know if am making sense here... so please bear with me...

Thank You.

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08-30-2012 03:01 AM  5 years agoPost 2
Mike Fortin

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USA

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Yes, the SBUS works with the VBar and is the rx.

The 2 make an excellent combination and were actually a breeze to setup.

Follow the VBar instructions and you should be find it pretty simple.

Have Rotors, Will Fly!

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08-30-2012 03:03 AM  5 years agoPost 3
jbiter

rrKey Veteran

Sebring, FL

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Whether you are using satellites as is the case with Spectrum or an S-Bus receiver in the case of Fasst, They are both receivers.

The Vbar merely processes the servo signals and is in itself not really a receiver.

Jeff

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08-30-2012 06:32 AM  5 years agoPost 4
S.Ratha

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Phnom Penh

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Thanks Mike and Jeff for the response. I love the S.Bus I think its at the forefront of rc technology and to me S.Bus has some witchcraft technology in it.
I still struggling to understand how S.Bus is sending signals to all the servos from one wire.

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09-04-2012 09:01 PM  5 years agoPost 5
PetterS

rrApprentice

Gothenburg, Sweden

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SBUS is just a digital protocol that sends 16 proportional and 2 switch channels in a frame. For some reason futaba is protecting its details with NDA, However Google search will show sources that have implemented this independently.

Sending many channels in a single wire is not new. DSC (direct servo control) that most non 2.4 system had in the past. However this signal was analog.

Hope this explains some.

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09-06-2012 08:54 PM  5 years agoPost 6
Skaluf

rrVeteran

Champaign, IL

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I still struggling to understand how S.Bus is sending signals to all the servos from one wire.
In the case of an S.Bus system, each servo or S.Bus device has a unique ID code, therefore it only responds to instructions addressed to its unique ID. The S.Bus receiver gets its instructions from the transmitter, encodes them and sends the data down the line to the various S.Bus devices.

Think of this as a road that data is traveling down, exits are servos and each has a unique exit number and is protected by a gate. When the exit sees data coming down the road with it's exit number it opens the gate and allows the data to exit, this moves the servo or whatever device is there.

Sorry for the overly simplified explanation.

Also, S.Bus is not a receiver, it is a communication protocol used by Futaba S.Bus receivers. In the case of your VBar, it is able to accept the S.Bus data stream. The Futaba receiver is still the unit getting the information directly from the transmitter.

Hope this helps a bit.

Steve

Steve Kaluf
Hobbico

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09-07-2012 07:53 PM  5 years agoPost 7
S.Ratha

rrNovice

Phnom Penh

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Steve,
The simplified explanation is very clear and very useful indeed. It helps us average Joes to understand what goes behind the products we use.

Ratha

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09-07-2012 09:52 PM  5 years agoPost 8
Mike Fortin

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USA

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Great explanation Steve, makes it pretty simple to understand.

Have Rotors, Will Fly!

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HelicopterRadio - Futaba FASST › S.Bus and VBar or any S.Bus compatible Gyro
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