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Author Topic: Translate all the jargon please!  (Read 918 times)

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Offline cheddar-caveman

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Translate all the jargon please!
« on: August 19, 2018, 09:09:15 AM »
I have a FlySky FS-i6 transmitter and have just bought a new Turnigy TGY-iA6B V2 Receiver 6CH 2.4G AFHDS 2A Telemetry Receiver w/SBUS.

Can someone please explain what "Now capable of iBUS, SBUS, PPM and PWM for enhanced control" means, what are all these expressions and where/when does one use them? I understand (I think) that it his something to the;emetry, where the receiver can send information back to the transmitter, or something??

And whats the row of connectors above the servo plugs?

Bear with an 80yo, big leap since the vibrating reeds  ::) :D
« Last Edit: August 19, 2018, 15:25:51 PM by cheddar-caveman »


Offline itsme

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Re: Translate all the jargon please!
« Reply #1 on: August 19, 2018, 10:04:44 AM »
I have a FlySky FS-i6 transmitter and have just bought a new Turnigy TGY-iA6B V2 Receiver 6CH 2.4G AFHDS 2A Telemetry Receiver w/SBUS.

Can someone please explain what "Now capable of iBUS, SBUS, PPM and PWM for enhanced control" means, what are all these expressions and where/when does one use them? I understand (I think) that it his something to the;emetry, where the receiver can send information back to the transmitter, or something??

And whats the row of connectors above the servo plugs?

Bear with an 80yo, big leap since the vibrating reeds  ::) :D
ask yourself- do you actually need to know?

Offline British Victory

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Re: Translate all the jargon please!
« Reply #2 on: August 19, 2018, 14:45:48 PM »
If you want vibrating reeds try ann summers ^-^
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Offline cheddar-caveman

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Re: Translate all the jargon please!
« Reply #3 on: August 19, 2018, 15:26:53 PM »
ask yourself- do you actually need to know?
I have always been of an inquisitive nature :D

Offline PDR

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Re: Translate all the jargon please!
« Reply #4 on: August 19, 2018, 15:42:21 PM »
Can someone please explain what "Now capable of iBUS, SBUS, PPM and PWM for enhanced control" means,

Bob's right (well there had to be a first time :ev ) you really don't need to know, but curiosity isn't (yet) a crime so if you're just interested - they're all different ways the receiver (Rx) talks to the servos:

PWM ("Pulse Width Modulation") - this is what we think of as the "normal" setup where each servo has a separate socket on the Rx, and the signal wire in that socket sends a pulse whose length indicates the desired servo position. Even though it LOOKS as if the Rx is talking to all the servos at the same time it actually isn't - it sends a pulse to each socket in turn. The transmitter actually sends all the pulses in a chain, and the receiver splits them out to send to each servo. That leads us to the next one:

PPM ("Pulse Position Modulation") - this is actually an abuse of a technical term because it isn't technically a PPM signal (but that's not important). A "PPM" output is a single signal that has the whole stream of pulses (all the servo signals in turn) coming out of one socket. This is mainly used in multicopters where all the signals are going to be routed into the same autostabilisation circuit. To avoid a mess of wiring they design the autostab to take all the servo signals directly from the PPM stream.This is actually the same signal that feeds the buddybox/trainer port on the Tx, and indeed feeds the RF module on a "modular" Tx. But you will generally only want to use the Rx PPM function if you are into multicopters.

SBUS is a system that looks to make wiring simpler in conventional aeroplanes. Like PPM it feeds all the servo data out of a single socket, and the original Futaba (it was originally a Futaba development, but has since been adopted elsewhere) concept was that the servos  would all be connected in a daisychain to that single wire (servos have sockets as well as plugs so they can pass the signal on to the next one). SBUS data included some servo-identifying numbers and the servos had to be programmed to respond to the right "channel". You can also get "SBUS Converters" which have several servo leads and a single SBUS plug to extract the individual servo signals for ordinary servos from the SBUS data stream. SBUS was (and is) a fundamentally bad idea because it introduces a massive single-point-of-failure. People do use it, but frankly they need their heads examining!

iBUS is similar to SBUS except that it's a 2-way data stream which means that you can also plug all your telemetry devices (speed, rpm, volts, current, temperature, brexit deal probability etc) into that same single socket. iBUS is a proprietary FlySky protocol (AFAIK) which no one else has adopted to date. While I'd have the same concerns as for SBUS about using it for servos I see no particular problem about using it for the telemetry devices.

Finally those extra sockets. I'm not familiar with Flysky gear, but I would guess that those sockets are for direct connection of telemetry devices.

So as you see - you probably didn't need to know any of that unless it happens to be the way your ghost gallops...

:)

PDR
« Last Edit: August 19, 2018, 15:43:33 PM by PDR »
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Offline itsme

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Re: Translate all the jargon please!
« Reply #5 on: August 19, 2018, 16:38:02 PM »
Bob's right (well there had to be a first time :ev ) you really don't need to know, but curiosity isn't (yet) a crime so if you're just interested - they're all different ways the receiver (Rx) talks to the servos:

PWM ("Pulse Width Modulation") - this is what we think of as the "normal" setup where each servo has a separate socket on the Rx, and the signal wire in that socket sends a pulse whose length indicates the desired servo position. Even though it LOOKS as if the Rx is talking to all the servos at the same time it actually isn't - it sends a pulse to each socket in turn. The transmitter actually sends all the pulses in a chain, and the receiver splits them out to send to each servo. That leads us to the next one:

PPM ("Pulse Position Modulation") - this is actually an abuse of a technical term because it isn't technically a PPM signal (but that's not important). A "PPM" output is a single signal that has the whole stream of pulses (all the servo signals in turn) coming out of one socket. This is mainly used in multicopters where all the signals are going to be routed into the same autostabilisation circuit. To avoid a mess of wiring they design the autostab to take all the servo signals directly from the PPM stream.This is actually the same signal that feeds the buddybox/trainer port on the Tx, and indeed feeds the RF module on a "modular" Tx. But you will generally only want to use the Rx PPM function if you are into multicopters.

SBUS is a system that looks to make wiring simpler in conventional aeroplanes. Like PPM it feeds all the servo data out of a single socket, and the original Futaba (it was originally a Futaba development, but has since been adopted elsewhere) concept was that the servos  would all be connected in a daisychain to that single wire (servos have sockets as well as plugs so they can pass the signal on to the next one). SBUS data included some servo-identifying numbers and the servos had to be programmed to respond to the right "channel". You can also get "SBUS Converters" which have several servo leads and a single SBUS plug to extract the individual servo signals for ordinary servos from the SBUS data stream. SBUS was (and is) a fundamentally bad idea because it introduces a massive single-point-of-failure. People do use it, but frankly they need their heads examining!

iBUS is similar to SBUS except that it's a 2-way data stream which means that you can also plug all your telemetry devices (speed, rpm, volts, current, temperature, brexit deal probability etc) into that same single socket. iBUS is a proprietary FlySky protocol (AFAIK) which no one else has adopted to date. While I'd have the same concerns as for SBUS about using it for servos I see no particular problem about using it for the telemetry devices.

Finally those extra sockets. I'm not familiar with Flysky gear, but I would guess that those sockets are for direct connection of telemetry devices.

So as you see - you probably didn't need to know any of that unless it happens to be the way your ghost gallops...

:)

PDR
See how much richer your life now is....

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Offline cheddar-caveman

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Re: Translate all the jargon please!
« Reply #6 on: August 19, 2018, 17:37:08 PM »
Thank you PDR for taking the time to enlighten an old fellah, I feel loved  :)

Offline itsme

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Re: Translate all the jargon please!
« Reply #7 on: August 19, 2018, 17:51:29 PM »
Thank you PDR for taking the time to enlighten an old fellah, I feel loved  :)
I feel confused.

Offline lanicopter

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Re: Translate all the jargon please!
« Reply #8 on: August 21, 2018, 11:53:33 AM »
PPM is a godsend if you're using a flight controller otherwise you end up with a massive rats nest of wiring
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Offline leckyBB

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Re: Translate all the jargon please!
« Reply #9 on: August 21, 2018, 15:01:15 PM »
Cheddar-caveman, do you actually have a copy of the User Manual? If not you can download it here: https://img.banggood.com/file/products/20151222032156FS-i6S%20User%20Manual.pdf
You really need to read through this manual as the set up and options can be quite involved.

I have a Flysky Fs10i set but also have the FS iA6B receiver for use in a glider. PDR has given you a good explanation for the communication options.
The other socket marked IN is for the connection of telemetry sensor options.

Good luck
Life is not measured by the breaths you take, but by the moments that take your breath away.

Offline PDR

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Re: Translate all the jargon please!
« Reply #10 on: August 21, 2018, 15:27:01 PM »
I feel confused.


Confused has tweeted a #metoo complaint and her lawyer is assembling the charge sheet for the judge...

:)

PDR
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Offline itsme

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Re: Translate all the jargon please!
« Reply #11 on: August 21, 2018, 16:03:55 PM »
Confused has tweeted a #metoo complaint and her lawyer is assembling the charge sheet for the judge...

:)

PDR
I didn't say 'felt'....

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