DM9 Binding mode requires positive PPM pulse ?

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aeroFred134
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DM9 Binding mode requires positive PPM pulse ?

Post by aeroFred134 »

Hi, just to report a short Taranis/DM9 Flight test this morning.
Tested with an Ar6100 (supected to be clone) and a genuine Ar6110 inside foamies
All went good, I' m confident with this alternative combo vs OrangeRx module.
Just a remark, and I would like to understand:
With a fresh model (simpy 4ch setup - PPM 1-8 22.5ms 300µ negative) I can't enter in binding mode with the DM9 module.
I tried the same settings in a 9Xr radio, and I get the binding mode (standard procedure with button)
I discover that in Taranis, with open tx r2604, I have to set PPM to Positive pulse to get the binding mode.
I''m curious about your experience and comments about that.
NB: An orangeRx Module doesn't require this positive setting.
Thanks

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Rob Thomson
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Re: DM9 Binding mode requires positive PPM pulse ?

Post by Rob Thomson »

Different modules either do or don't work with positive or negative :)

That's why you have the option to set it.

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aeroFred134
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Re: DM9 Binding mode requires positive PPM pulse ?

Post by aeroFred134 »

thanks, I admit this option is here for something, but the same module with the same software in two different transmitters doesn't work the same, it seems odd to me
, and I have to change this settings every time I create a model... this is a little drawback only on Taranis and with this module ? I have read nothing about that, I was lucky to find out how to solve this problem.
G550Ted
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Re: DM9 Binding mode requires positive PPM pulse ?

Post by G550Ted »

This is neither a drawback nor a requirement that you change anything when creating a model. Polarity shift is model specific. When using any external module you must select the appropriate protocol and other specifics applicable to your hardware configuration. Spektrum/JR has typically always used positive shift polarity as far as my experience is concerned and Futaba negative shift. Set it and forget it, it's not an issue.

Ted
aeroFred134
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Re: DM9 Binding mode requires positive PPM pulse ?

Post by aeroFred134 »

I agree that's not an issue, but default negative pulse seems ok with it in er9x or openTx when used in 9xr or T9 transmitters, that's why I was (and remain) confused.
http://openrcforums.com/forum/viewtopic ... 239#p30881
Positive is positive, and negative is negative whatever your transmistter (I thought... )
Perhaps my post will help someone else if i'm not the only one concerned.
Like I wrote, "All went good" finally.

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Kilrah
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Re: DM9 Binding mode requires positive PPM pulse ?

Post by Kilrah »

Previous reports suggest the DM9 always needed positive shift, also on the 9x.
I think it "half works" with negative.

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