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04-05-2013 08:54 PM  6 years ago
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jamesmac

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Edinburgh

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Futaba GY430 Gyro
Hi

Is it possible to use a standard (non SBus) digital servo with the GY430 if using the SBus connection?

James
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04-06-2013 12:30 AM  6 years ago
Dr.Ben

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Richmond, VA, USA

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There is no issue at all because the output signal is to the rudder servo is pwm. Pretty much the same concept as a CGY750 which is S.Bus input but has specific output slots in the amplifier for the various function's servos. S.Bus servos are not required there either.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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04-07-2013 11:34 AM  6 years ago
jamesmac

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Edinburgh

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Thanks Ben,

I was puzzled as the GY430 manual states in the notes at the bottom "conventional servos cannot be used by the S.BUS output" Am I right in saying that by "conventional" they mean non digital?

Thanks,
James.
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04-07-2013 06:12 PM  6 years ago
dkshema

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Cedar Rapids, IA

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Am I right in saying that by "conventional" they mean non digital?
No. Analog and Digital servos, for the most part are interchangeable, as they both use the same pulse-width modulated signal coming from the receiver. As "conventional" servos, they look for the width of a pulse coming to them that is nominally 1.5 msec wide, and that varies over the range of 1 msec to 2 msec for full stop to stop travel. The pulse generally comes to the servo at a rate of 50 to 60 times per second.

S.BUS servos use a completely different position signal coming to them, it is a serial stream of data bits. It is no longer a pulse width modulated signal, and a conventional servo would not know how to process the serial signal.

Futaba makes an adapter for the S.BUS system which allows you to run conventional servos.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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04-07-2013 07:07 PM  6 years ago
Dr.Ben

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I will review the manual.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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04-07-2013 08:22 PM  6 years ago
dkshema

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Cedar Rapids, IA

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I downloaded the manual and took a look through it. From what I can gather, the unit will operate a standard digital servo when you drive it with an S.BUS input.

It also looks like the gyro itself doesn't support the use of S.BUS servos, but will accept S.BUS input signals.

With a conventional receiver, you hook up the rudder channel output and the gain control output to the gyro, and the servo to the gyro.

If you don't hook up a gain control channel, then you can manually adjust gain using the built-in pot. This would seemingly free up channel 5 in your receiver, allowing you to have a gyro AND a governor, making it possible to fly a nitro heli, with a gyro, and a governor, with only a 6-channel receiver.

If you use an S.BUS receiver, there is only one connection between the RX and the gyro, and that connection appears to be set up so that the gyro responds to the rudder AND gain commands in the S.BUS data, but still drives a conventional style servo.

Use ONLY a digital servo, as the frame-rate out of the gyro will smoke an analog servo.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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04-08-2013 12:48 AM  6 years ago
Dr.Ben

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Richmond, VA, USA

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Dave,

You can plug an S.Bus servo into any conventional device whether it be S.Bus or not provided it will support a digital servo. The S.Bus part of the servo only comes into play in a specific S.Bus application. All of the cyclic servos in my E720 are S.Bus, but none is operating with a device with a serial bus servo output. This being the case, you could use a BLS274 SV with this gyro with no problem.

With time I will wager that pretty much every premium grade Futaba servo will be S.Bus capable. Whether that functionality is tapped is up to the consumer for their particular application.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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04-08-2013 12:57 AM  6 years ago
Dr.Ben

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James,

The S.Bus description at the bottom of the manual's page is their "vanilla" explaination of S.Bus. In the context of your confusion over this product, I would read and follow the device specific instructions. Those are well done and understandable.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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04-08-2013 08:11 AM  6 years ago
jamesmac

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Edinburgh

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Ben/Dave,

Thanks for your thoughts on this, you have been very helpful. Just so you know - the application may be for my 1/4 scale Jet Ranger as I want to run on S.Bus (with telemetry for gearbox temp & head speed)using my new R7008SB/14SG Tx. so I'm looking for a tail gyro to replace the GY401 that can run from S.Bus.

Regards,
James
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04-08-2013 06:16 PM  6 years ago
Dr.Ben

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Richmond, VA, USA

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That would be a good choice. GY520 is S.Bus capable too.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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