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HomeAircraftHelicopterRadio - Futaba FASST › R7008SB FASSTest Receiver and SK540
06-07-2012 03:29 PM  6 years agoPost 1
wjvail

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Meridian, Mississippi

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Hey all... I don't know if this is a Futaba question or a Skookum question. I'll ask it here. If I hear crickets (no reply) I'll try elsewhere.

I've been using my new Thunder Tiger E325 V2 FBL as a test bed for the new Skookum SK540 and to get a handle on what S. Bus can do for me. I've been having a ball with the little thing using my new 18MZ TX paired with a R6203SB 3-18 channel receiver.

Here comes the question. I spent a good part of yesterday trying swap out the R6203SB receiver for the FASSTest R7008SB receiver that came with the 18MZ TX. I wanted to play with the S. Bus2 features. The problem is, I can't get the SK540 to respond to the R7008SB receiver.

I've been through the steps described on page 26 of the 18MZ manual trying to put the R7008SB into "Mode B" where channel 8 functions as an S.Bus port. Even though I've been through these steps quite a few times there doesn't seem to be a signal going from port 8 on the RX to the SK540. The SK540 does not initialize, the speed control doesn't arm, and the SK540 software does not show stick movement.

The TX and RX are speaking well with each other. I see the RX voltage on the TX, there is a solid green light on the RX, and servos plugged directly in to ports 1-7 (for testing) on the RX respond as they should.

There are quite a few new technologies in play here so as I said, I'm not sure where the problem is. I have a great flying heli using the 3 channel RX but I'd really like to get the S.Bus2 RX working. The point of building this heli was to learn something.

Any help? Where am I going wrong? Why can't I get my R7008SB RX to talk to my SK540? Anybody been down this road yet?

Cheers,

Bill

"Well, Nothing bad can happen now."

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06-07-2012 08:39 PM  6 years agoPost 2
Skaluf

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Champaign, IL

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Bill,

I don't know anything about the Skookum system so I'm not going to be much help there.

I would suggest checking to assure you do in-fact have the R7008SB in mode B. Do this by plugging an S.Bus servo into that the S.Bus port.

When you program the receiver you have to assure you see the two blinks of the LED to indicate mode B, then hold the button down to see the confirmation blinks. Once done, power down and back up to assure it's working.

Steve

Steve Kaluf
Hobbico

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06-07-2012 10:38 PM  6 years agoPost 3
Phaedrus

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S. Orange County, California

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Also make sure you are using the vertical S-Bus port that is at the end of the servo plugs next to 7/B and Not the horizontal S-Bus port underneath all the other plugs. That port (S-Bus 2)is for the telemetry sensors.

Oops, sorry, just re-read your post and noticed your are using port #8. I'm no help and I need to brush up on my reading skills!!!

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06-09-2012 03:35 AM  6 years agoPost 4
wjvail

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Meridian, Mississippi

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Thanks Steve and Phaedrus...

It occurred to me to plug a S.Bus servo into slot 8 to see if I've got the R7008SB in "Mode B" but I don't have one. Phaedrus- Your comment about not using the "horizontal" S.Bus2 slot is not out of line. I had to read the manual to make certain I was doing this right. After 40 years of R/C, much of this is new (to me).

Part of building yet another heli was to get my arms around what S.Bus could do for me. Using a single lead from a "3 channel" receiver to control a complex heli is really cool. Yes the SK540 added some weight to a small heli but it seems to be offset by the fact there is no flybar or tail gyro. By using a S.Bus compatible flybarless controller, I avoid the complexity of S.Bus hubs, servos, programmers, etc. Just a single male/male plug from RX to FBL controller. VERY NICE.

Part of what I wanted to play with was the S.Bus2 and the telemetry but that has been put on hold because I've gotten frustrated with the time spent getting the SK540 and R7008SB to play nice together. I've just been having too much fun flying the thing to stop and work on getting the new RX to work.

Is there another way to verify what mode the R7008SB is in other than plugging in an SB servo?

I think I'll write Skookum. Maybe I'll hit the Skookum forum. Maybe I'll reread the manual and try again. Or, maybe I'll just charge some batteries and fly some more!

Thanks,

Bill

"Well, Nothing bad can happen now."

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06-09-2012 06:18 AM  6 years agoPost 5
Phaedrus

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S. Orange County, California

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Take a look at page 26 of the manual. With the transmitter OFF press and hold down the mode button on the end to enter the programming mode on the RX. You want to see the RED LED blink twice to indicate Mode B.

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06-14-2012 02:21 AM  6 years agoPost 6
wjvail

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Meridian, Mississippi

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Watch at YouTube

Alright. So I made a short video. I think I'm doing this correctly and I'm pretty convinced I need to write Skookum for help.

Could I make a request for an $11.00 S3003SB servo?

Thanks guys for all you help.

Bill

"Well, Nothing bad can happen now."

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06-14-2012 03:11 AM  6 years agoPost 7
Wyorcflyer

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Cheyenne, Wyoming USA

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Since you are able to run the gyro with an R6203SB using SBus it should not be the gyro.

When you repower the receiver and get three blinks does that indicate the type of receiver mode? If so that is 9-16 mode per the chart on page 26.

1. After you change the receiver to 1-7 SBus do you need to relink with the transmitter? The instructions don't seem to say.

2. When you think you are in SBus mode I would stick a normal servo in the SBus slot. If that servo responds on channel 8 or 16 then you must not be in SBus mode. At least I don't think a regular servo will respond if plugged into an SBus slot.

3. Do different receiver modes give different numbers of blinks on startup? The instructions don't seem to say. If so try reprogramming until repower shows two blinks instead of three.

Just thoughts to try.

Jack

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06-17-2012 02:52 PM  6 years agoPost 8
4cyclic

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Montreal, Can. and northern Vermont

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Regardless of many times I tried to program Mode B, it always beep 3 times red on re-power. How do we know it is in fact Mode B, just don't want to buy a s.bus servo to confirm Mode B.

Life is meaningful flying helis.

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06-17-2012 03:24 PM  6 years agoPost 9
Phaedrus

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S. Orange County, California

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I just want to confirm that the transmitter is off when doing this.

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06-17-2012 04:59 PM  6 years agoPost 10
wjvail

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Meridian, Mississippi

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I've tried it both ways. TX off and TX on.

Again, I don't want this to sound like a Futaba/S.Bus problem. I will concede that the technology is new to me, Futaba, Skookum, and everyone else and I just may not be doing it right. It may turn out that the protocol of S.Bus2 is different and Skookum will have a firmware update. I'm having fun flying and that's what really matters.

The only thing I would like is some way to confirm the RX mode without having to buy an SB Servo. S.Bus components are comically expensive and I refuse to spend $60.00 (the most inexpensive S.Bus servo) for a servo I don't need just to confirm the RX mode.

Again, we need a $10.00 S3003SB servo. You could put 22 of those on an S.Bus for the price of one BLS172HV. Please put "SB" on the end of this -> http://www3.towerhobbies.com/cgi-bi...?&I=LXVW84&P=ML

Cheers,

Bill

"Well, Nothing bad can happen now."

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06-17-2012 05:12 PM  6 years agoPost 11
Wyorcflyer

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Cheyenne, Wyoming USA

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Bill:

Did you try test number 2 in my post above, sticking a regular servo in that slot to see if it is getting a normal servo command?

Jack

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06-17-2012 05:19 PM  6 years agoPost 12
4cyclic

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Montreal, Can. and northern Vermont

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Tx off

Life is meaningful flying helis.

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06-17-2012 06:29 PM  6 years agoPost 13
wjvail

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Meridian, Mississippi

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Did you try test number 2 in my post above, sticking a regular servo in that slot to see if it is getting a normal servo command?
Good question (again ).

I've got something charging to go fly this afternoon so I have a minute. I just ran to the shop to try...

Here are some things I learned.

1. If I put the RX in what I believe is "mode B" (two blinks), slot 8 will not drive a standard servo. It is worth mentioning that channel 8 on my 18MZ, by default, isn't mapped to any TX stick, slider, or switch so of course it initially didn't work (in any RX mode). I then mapped it to the aileron stick and slot 8 will work in Mode A but not Mode B with a standard servo.

2. If I then put the RX back into what I believe is "Mode A" (one blink), slot 8, as well as 1-6, functions as mapped.

3. I can switch Modes with or without the TX on and linked to the RX.

4. Cycling the RX power at the end of the Mode change procedure as instructed in the manual pg. 26 is probably advisable but doesn't seem to be required.

5. While I've verified the mode, mapping, and functioning of "Mode A" with a standard servo, I don't have the time right now to plug my FBL controller back into slot 8 and verify it is functioning in S.Bus mode.

Bill

"Well, Nothing bad can happen now."

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06-25-2012 06:17 PM  6 years agoPost 14
4cyclic

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Montreal, Can. and northern Vermont

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Well I had mine in mode B very easily after all. Just same as vid, takes a few seconds. Bind rx ID in 18MZ, then plug single lead from v-bar into R7008SB 8/SB slot and check servo operation in v-bar software and I was off flying right away.

Life is meaningful flying helis.

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06-25-2012 07:53 PM  6 years agoPost 15
Skaluf

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Champaign, IL

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From your video it does appear you have it in the correct mode. Does the Skookum unit set gains only in the gyro, or does it accept from the transmitter? If the tx, do you have gains set in the gyro menu? Secondly, do the channel assignments in gyro match what is assigned in the tx?

Any of the above can make the unit not function.

Steve

Steve Kaluf
Hobbico

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