I have the DX3R Pro transmitter, and 3 of the SR3100 DSM2 receivers. They have all been working great for years. I simply wanted to use one of my SR3100's in a new RC car that I just built. I took it out of a 100% working RC car (confirmed it was working), to transfer it into the new RC car.

Because it was being used with a totally different ESC and motor, I decided to start the binding process over again. I used the binding plug that came with the system. I powered it up with my new ESC/motor combo, and I could not get it to go into binding mode (LED flashing). I tried 3 different binding plugs, and I'm certain that's not the problem. I tried multiple batteries as well. No difference.

I put the receiver back into the old RC car, using the previous ESC and motor. I was able to get it to go into binding mode that one time only! (LED flashing). So I paired it back with the new system, and I could never get it to go into binding mode again, using any combination.

I have tried 2 completely different Traxxas Velineon systems. I have tried 2 different LRP/Reedy combos. I have a brand new HobbyWing Max 8 combo as well as a brand new HobbyWing Max 10 SRT combo I want to start using.

Eventually I took out my other 2 SR3100 receivers to try because I was thinking that somehow I must have broken the first SR3100. Well, I can't get any of the 3 of these SR3100's to go into binding mode at all.

My last thought was that maybe I couldn't bind the SR3100's because they were already binded to the transmitter on different presets, so I deleted the original presets. Now nothing works at all! All 3 of the SR3100's don't work now, and they were all working before.

I purchased a brand new SR3100 (this will be the 4th one). It's on the way and I should have it next week.

Before I even plug in the new one, I need some advice. What could I be doing wrong? How can I recover the other 3 SR3100's?

Here was my exact process in trying to get the SR3100's to bind. It's not that complicated, but what am I missing?

1. With the SR3100 disconnected (turned off), I connected the binding plug to the Batt/Bind port.
2. Powered it on by connecting the ESC to the SR3100, and then the battery to the ESC. I also tried connecting the ESC while the battery was already connected. No difference. The LED lights dimly solid. It never flashes continuously to indicate it's in binding mode.
3. I can never get to step 3 which would be to turn on the transmitter. On the SR3100, the LED lights dimly solid. It never flashes continuously to indicate it's in binding mode. Regardless even if I try to bind from the transmitter, it never finds the receiver.

Please help!

This is a weird one for sure and I don't have and great ideas but go with the basics, plug in only the bind plug and the esc, no servos and see what happens. Do you know how much voltage the esc's are sending to the receiver?

Out of curiosity how much did you buy the new SR3100 for and where from? I only ask because Spektrum stop making them back in 2015.

Well, the first question is why do you NEED to use the ESC as part of the binding equation? Unless I'm missing something, it should not matter, you're not binding the RX and ESC together but rather the RX and radio. You can simply plug a battery into the RX for binding purposes. You only need the ESC plugged into the RX to perform the throttle calibration and actual useage.

You don't mention what new ESC you're using so this begs the question: What is the output BEC voltage of the new ESC? Is it possible you fried the RX? This is clearly has nothing to do with the radio if the RX won't even blink with the bind plug plugged in to indicate it's in bind mode. Unless the bind plug pins are in the wrong location (should be on the outside ends), this one is a doozie.

Kent - Thank you so much for your reply, and suggestion. I didn't mention it, but yes I did try with the ESC only as well as with the motor and servo connected as well. It was the same problem both ways. I don't have the ability (or the adapter at this time) to bypass the ESC completely, and go straight from a battery to the SR3100 receiver. I only have lipo batteries. Not sure if I can do that without using a nicad.

The original 3 of them that were working before were all legit Spektrum brand units I paid $99 each for years ago.

I know they are discontinued now. I got it on Amazon. Its probably a knock off but it should be DSM2 and compatible. I see now there are no reviews at all, so maybe that's bad. The one I just picked up was $36 dollars. It won't let me post the direct Amazon URL on here, but if you search "WILLOWLUCKY Spektrum SR3100 DSM2" you'll find it.

Thanks again!

Werty Yui- He needs the ESC because from what I read he is an electric user and has no battery or battery adapter that can plug directly in to the RX. He did mention that he has tried multiple esc's(2 Traxxas Velineon systems, 2 different LRP/Reedy combos, brand new HobbyWing Max 8 and a brand new HobbyWing Max 10 SRT combo). The SR3100 only needs a minimum of 3.3 volts to properly operate and most esc's generally supply at least 5 volts, highly unlikely that all of those esc's are bad. If they are that's a much worse day than RX binding issues.

Hopefully he figured it out.

No binding plug required.
The SR3100 has a bind button.
Press and hold the button down while turning on the receiver...

see page 12 in your manual

https://www.spektrumrc.com/ProdInfo/...100Binding.pdf

Are you thinking of the SR315?

my bad... It was noted for the sr3001 note the 3100...

I have tried to post several replies of the last week, but they never show up in the thread. I don't know why. Sorry if it seems like I'm MIA. Must be something I'm doing wrong when I reply. TEST TEST TEST

Werty,

Thank you for your reply, questions and suggestions. I don't have a way to power on the receiver without it. I've learned there is an adapter that you can get to go straight from the battery directly to the receiver. I only have lipo batteries. Is that safe to do, or would I need a nicad?

I did expect that I was going to need to perform the throttle calibration and stuff, so that's why I approached it from there to begin with. I'm realizing I have just made lots more work and frustration for myself now though, and possibly broke all 3 of my SR3100's.

For the first test, it actually was another (different) Traxxas Velineon ESC with a Tekin Motor, and AE XP DS1015 Servo. But it was original used with a Traxxas Velineon combo and Traxxas servo before. Later I tried with the motor and servo disconnected, ESC and battery only. I don't know what the output BEC voltage is, so I Googled it. The BEC Voltage of the Traxxas is 6.0 V.

THANK YOU

Kent,

You asked where I got the new SR3100 because they are discontinued. I got it on Amazon. It was $36. I'm not sure if its a Chinese knock off or what. I can't post a direct link on this page, but if you go to Amazon and search "WILLOWLUCKY Spektrum SR3100" you'll find it.

I just got it in the mail this week, but I haven't tried it yet. I'm sort of afraid to. I'm considering getting an adapter to connect directly from my battery to the SR3100 for binding. I only have 2s lipo batteries though, and they have Deans connectors. Is it safe to connect lipo directly to the SR3100 in this manner, or does it have to be nicad? Is there an adapter you're aware of to go directly from Deans or Bullet plugs to the SR3100 receiver?

THANK YOU
​​​​​​​

You noted the LED lights dimly solid. Sounds similar to a few I have seen, in those cases it turned out the power plug (esc in your case) was reversed, reverse voltage to the Rx. Make sure the black/negative is to the outside, if memory serves.

Nice! I didn't think of this possibility!

Dave,

Thanks for the suggestion. I was able to try the brand new SR3100 I ordered last night (SR3100 number 4), and I'm having the SAME PROBLEM! I tried to post a picture of exactly how I have it connected, but because I'm new I can't post a picture or share links apparently. So I will describe it in detail.

This time I used my brand new out of box Hobbywing MAX10 SCT ESC, its never been used. I tried without the motor connected or any servo connected. I'm using a 2s LIPO battery.
Binding plug inserted into the BAT/BIND port.
ESC connected to the THR port. White wire on -, Red wire on +, and Black wire on Ground.
Powered it on and same problem. The LED on the SR3100 lights up dimly solid. It doesn't blink and go into binding mode.

I guess my next step will be to get an adapter to go directly from the battery to the SR3100 receiver to get it to go into binding mode.
Is it safe to use LIPO for this? Or do I need a nicad battery?
Does anybody have a line on the cable I'd need for this? All my batteries have Deans connectors, but regardless I could solder one.
What do you call those tiny connectors that plug into the receiver?

Thanks everyone!

It reads like you are plugging it in backwards. White is signal noted on my older hobbywing XR10 by a letter S embossed on the connector or sometimes by a pulse. - is black and + is red