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DX7 Bind Procedure For Fail Safe protection.

zac123

Senior Heliman

Northern New Jersey,USA

I have had my ship now for 3 weeks and have a few problems and have had some fun but here is one more problem. First the details; the ship was pre built with these items installed - engine,servos,voltage regulator,battery,gyro,power switch. I bought a new DX7 less servos-battery and switch harness. All that was needed was to install the receiver and go. So I broke in a new OS Hyper 50 and taught myself to fly nose instead of tail and was ready to take her up. Just over the weekend found main spur gear and pinion gear out of alighnment and had to replace spur gear last night. So tonight I thought I would check "Fail Safe Setings". That was a horror!! When I shut the radio the ship goes full throttle!!!! LOL. Out comes the book and I go to the directions to set fail safe to neutral stick and throttle down. They show a picture of how to hook up receiver-battery-switch and bind-plug. There must be something special about the supplied switch with the DX7 that I did not get. The power switch on my ship goes to the voltage regulator with one wire that brakes the circuit to shut regulator power off. How else can I set up fail safe without being able to hook things up the way they show in the book. My ship is getting so close to being perfect that this problem is actually funny. Also- I cant remember how I set up fail safe on my old JR-X347 but I know it was not something silly like this. (sorry,just my openion)

02-07-2008 Over year old.
Blade_Master1

Elite Veteran

Canada

easy enough

after you bind the reciever while in bind mode setup your heli to the failsafe position you desire.
then turn off reciever and remove bind plug

turn back on reciever and turn off TX to verify failsafe positions

02-07-2008 Over year old.
HOMEPAGE  
george0079

Elite Veteran

USA

Simply unplug one of the servos, remove the power lead that goes to the receiver, plug the power lead into the port that you removed the servo from, and plug the bind plug into the power port.

It is important that the bind plug be in the power port. Any of the other port will accept he power lead.

Then bind the receiver with the throttle in the fail safe position that you want.

Hell... I can fix that.
Uh oh..
Nope.
It's ***ked!!!
RE-KIT!!!!!

02-07-2008 Over year old.
cwright

Key Veteran

Blossvale New York

The DX7 only fail safes the throttle. All the other controls stay at there last point. Chuck

02-07-2008 Over year old.
Blade_Master1

Elite Veteran

Canada

I'm a little confused by your post
If you are asking how to enter into bind mode with all that stuff

here what I just tried
use a paper clip or wire to connect the negative (black) lead and signal (orange or white NOT red) lead on the battery charge plug turn on reciever it will enter bind mode.

I only know that this works on the spektrum switch

02-07-2008 Over year old.
HOMEPAGE  
Blade_Master1

Elite Veteran

Canada

george I just tried what you said that doesn't seem to work I tried the throttle and the AUX port won't enter bind mode

The negative and signal lead short on the bat charge plug works no need to unplug anything

02-07-2008 Over year old.
HOMEPAGE  
Micro-Maniac

Elite Veteran

Pasco,Washington Formerly: Captain Chaos

I set my throttle-hold to what I want it to be in fail-safe then turn the TX off
Bind plug the RX and power it on - LED should flicker indicating bind mode
Position the sticks and switches on the TX to how I want the heli to power up (except for throttle-hold)
Hold the bind button on the TX and power it on and quickly flip on throttle-hold
Power off RX and remove bind plug

Even though only the bound throttle position is used during fail-safe the other bound control positions are used during power on while the RX links to the TX as to not over-drive and bind the servos etc

02-07-2008 Over year old.
george0079

Elite Veteran

USA

george I just tried what you said that doesn't seem to work I tried the throttle and the AUX port won't enter bind mode
That seems strange. I've done it on 5 different helis, with 7 different receivers, this exact same way.

Hell... I can fix that.
Uh oh..
Nope.
It's ***ked!!!
RE-KIT!!!!!

02-07-2008 Over year old.
dkshema

rrMaster

Cedar Rapids, IA

The bind plug for the receiver plugs into the slot where the pigtail from the switch harness would go -- the RX battery slot. If you intend to bind using the switch harness, the binding process requires that you use a switch harness that has all three wires -- the red, brown, and ORANGE lead you'd typically see in a JR heavy duty switch harness. In an FM/PPM system, the three-wire harness is also required to use the Direct Servo Control (DSC) cable that allows you to control the servos from your TX without having to turn the TX on.

A switch harness that does NOT bring out the third pin from the RX battery slot WILL NOT LET YOU GO INTO BIND MODE.

In any event...when you bind your RX to the TX, the RX learns the position of the sticks, and uses those positions as the fail safe setting. At least that's what the manual leads you to believe. In reality, the only control that gets a fail safe setting during the bind process is the throttle channel. All remaining channels in the DX7 are set to hold the last known position when fail safe is activated.

-----

The DX7 is supplied with two bind plugs. One is a female plug (to mate with the charge lead on the JR/Spektrum Heavy Duty switch harness), the other is a male plug (as you'd find on a servo lead).

The male plug is handy if you're flying an electric chopper in which you would normally plug the combination ESC/BEC into the throttle channel of the RX.

If you had an electric heli in which power would be applied to the throttle channel plug by your ESC/BEC, you'd plug the male binding plug into the empty battery slot of the DX7 RX when you applied power to the RX through that ESC/BEC in the throttle channel.

-----

If you take a look at the typical JR/Spektrum servo or battery plug, you'll see three wires...the red one in the middle is + power from the battery. The brown one on one end of the connector is the battery GROUND wire. The orange wire on the opposite end of the plug would be the signal wire for the servo, over which the servo gets its position pulse.

In receivers that have a separate battery port, generally only two of the three pins are connected -- the center pin (+ battery), and one of the outer pins (battery ground). The third pin would be not connected. In the case of the DX7, however, grounding that third pin as the bind plug does, puts the receiver into bind mode when power is applied.

(In the case of JR receivers, that third pin on the battery plug is dedicated to the DSC function, but that's a whole different story).

-----

The bind plug simply ties the two outer pins of the connector together, and it gets plugged into the RX BATTERY slot. In order to put the RX into BIND mode, you MUST tie the two outer pins of the BATTERY port together. Power is applied as usual through the center pin.

So, your switch harness is the culprit, it does not allow you to ground the third pin of the battery connector when power is applied to the RX, and therefore, you're not getting into bind mode.

-----

The solution? Disconnect your switch harness from the RX battery port. Insert the MALE bind plug that came with your DX7 into the battery port of the RX.

Plug your battery into any unused channel on the RX. If you don't have an unused channel, temporarily unplug a servo so you can plug the battery into its slot. You don't need to have a servo plugged in to set the fail safe or to bind.

If you don't have a bind plug, take a servo extension cable and cut off the female end. Solder the two outer wires (orange and brown) together. Plug the male end into the RX battery slot. Voila, instant home made bind plug.

-----

With the bind plug inserted into the RX BATTERY slot, the battery plugged into any available slot, turn on the power to the receiver. LEDs in both the main RX and the satellite RX will be flashing.

Set your throttle stick to LOW, set all other sticks to neutral on the TX. Push the BIND button on the back of the transmitter WHILE you are turning the transmitter on. The bind button MUST be pressed when you power up the TX to put the TX into bind mode.

Let the TX and RX do their bind thing. Both LEDs in the main and satellite RX's will go solid when binding is complete.

Turn the RX off, REMOVE your bind plug. Plug your battery back into the battery port, and if you disconnected a servo, plug it back into the appropriate slot.

You're done.

-----

Remember -- in the DX7 the ONLY function that actually gets a user-selectable fail-safe position is the Throttle channel. All other channels are programmed to hold their last known position for the duration of the event that put you into fail safe.

-----
Dave

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

Team Heliproz

02-07-2008 Over year old.
RayJayJohnsonJr

Key Veteran

Midwest

In reality, the only control that gets a fail safe setting during the bind process is the throttle channel. All remaining channels in the DX7 are set to hold the last known position when fail safe is activated.
Not totally worthless, but next best thing to totally worthless. I'm trying to set one of these up for a friend. I'm just finding this out about the failsafe. DX7? No thanks. Not for me!

-Mark

There, their and they're. It's really that simple.

08-21-2008 Over year old.
Pinecone

Key Veteran

Maryalnd

1) You can only enter bind mode by connecting the two outer pins of the BATT port. No other port.

2) All Spektrum, 7 ch or lower work this way. They hold last good position on everything other than throttle. BUT, what you do set, is the initial setting of all the other controls while the Rx is powering up and linking to the Tx.

3) The Spektrum (and JR) 9 ch (and probably 12, but not sure) you can either set as per the 7 ch or you can set every channel to a specific position. To so so, put in bind plug, power up, then REMOVE the bind plug, then power up Tx and set fail safe positions.

And yes, the 9 ch Rx works with the DX7.

Terry
Blade CP Trex 450 SE
QJ EP8v2 EX Gaui Hurricane 550
Vibe 50 Bergen Intrepid Gasser

08-21-2008 Over year old.
danstah

Heliman

Yuma, AZ

1) You can only enter bind mode by connecting the two outer pins of the BATT port. No other port.

2) All Spektrum, 7 ch or lower work this way. They hold last good position on everything other than throttle. BUT, what you do set, is the initial setting of all the other controls while the Rx is powering up and linking to the Tx.

3) The Spektrum (and JR) 9 ch (and probably 12, but not sure) you can either set as per the 7 ch or you can set every channel to a specific position. To so so, put in bind plug, power up, then REMOVE the bind plug, then power up Tx and set fail safe positions.

And yes, the 9 ch Rx works with the DX7.
I was wondering if anyone had tried this on a 6 ch or lower spektrum receiver. I got this to work with an AR7000 and am thinking of getting an AR6100 because they are much cheaper.

04-13-2009 Over year old.
Pinecone

Key Veteran

Maryalnd

AFAIK only the AR7000 with the lastest sfotware works like this.

And you have to hold the stick positions and the bind button until the servos actually move to the desired fail safe (loss of signal) positions. If you don't, it doesn't work.

Terry
Blade CP Trex 450 SE
QJ EP8v2 EX Gaui Hurricane 550
Vibe 50 Bergen Intrepid Gasser

04-14-2009 Over year old.
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DX7 Bind Procedure For Fail Safe protection.

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