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HomeRC & PowerAircraftHelicopterRadio - Futaba FASST › Futaba get with the Program
01-11-2010 07:47 PM  8 years agoPost 21
Smok

rrApprentice

Antwerp, Belgium

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@Flying Tivo:

I hear what you are saying but I guess you did not go over my post...

Serial or parallel in principle has nothing to do with latency,
unless you also take the encoding and signaling rate.
So "serial must be slow" is a false assumption...

Btw. this serial/parallel/signaling/latency and the likes
is something I am doing for a living ( but not with RC

On a legacy servo cable the RX (or gyro) sends the positioning
signal at 50Hz for analog servo, then at ~300Hz for a regular
digital servo and lastly at over 500Hz for a narrow pulse servo.
The signaling latencies (max) are inversely proportional
to the position update frequency.

Now with Sbus - it needs to multiplex the data for all devices
sharing the bus - but who said what are all the signaling rates
available on the SBUS ? ...I guess one has to work at Futaba
to know that for sure.

Let's look at some numbers, for comparison:

A tail super-servo with 2048k resolution and 500Hz signal rate
it getting roughly 1Mbit/s of effective positioning data.

Is that fast or slow - let's compare with another commodity - USB:

The current crop of USB 2.0 chips are available at peanuts price
and they can carry 480 Mbit/s of data - it's roughly 500 times more
than a servo cable. So at that rate it could send data to 20 servos
with latency 25 times less than a tail super-servo signaling latency,
and that with 2048 resolution.

That is just a comparison to a commodity serial bus interconnect,
I have no access to any SBUS specs - to say what are the current
and future signaling rates - I understand that before putting
SBUS on the market, Futaba first developed some future roadmap
for it's upcoming features and speeds/feeds - they could do that
having no established market standard for a serial servo bus.

I am not basing any of my current purchases on that SBUS story,
but I guess it will be interesting to see it develop...

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01-11-2010 07:53 PM  8 years agoPost 22
Smok

rrApprentice

Antwerp, Belgium

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@Stick Twanger

You are probably right with the industrial FHSS stuff, but I was
referring to 2.4G radios for the RC market - where (afaik) Spectrum
came with the first product - but Futaba took some more time
and came up with the right product

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01-11-2010 09:04 PM  8 years agoPost 23
ErichF

rrElite Veteran

Sutton, NH

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I thought Futaba first brought 2.4 to the surface RC market, which means first to RC as a whole?

You're right Smok, Spektrum was the first to rush into 2.4 on the airborne scene, but the implementation was sloppy in order to be first. At least, in my opinion, they were.

Erich

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01-12-2010 02:45 AM  8 years agoPost 24
davehour

rrElite Veteran

Guayama, Puerto Rico 00785

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I've read Futaba have been using their FASST technology for many years in their industrial market, their biggest business, before it was first introduced in the R/C market. I bet non of the R/C manufacturers have the idea of using the 2.4 band when Futaba was using it already in their industrial applications.

David

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01-31-2010 04:59 AM  8 years agoPost 25
BRB Pilot

rrNovice

Bowie, MD - USA

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Don't forget the wireless buddy box system, no other company has one of those, except if they bought a Futaba one.
Not true. The XPO Co-op Pilot System "Wireless Buddy Box" made the market before Futaba came out with their system. Furthermore, this system works with any Brand Name/technology from as far back as AM to 2.4Ghz. You can buddy box any system and the pilots on the ground are not connected to each other.

Visit www.2icrc.com to read about it and see some videos.

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