Devo 12S + ar7200bx + tm1100 no values...

Hi,
I use an ar7200bx (dsmx) + sat since 2 years on my trex 550e v2, with devo 12S under deviationtx Nightly builds and all is good.
But today i would like to use a TM1100 telemetry modul for having Vbatt of main Lipo and Vbatt for my lipo of receiver.

So, i have plug AR72100bx data to TM1100 data, i make a new bind procedure for having AR7200 + sat + TM1100.
Bind seems to be ok, my helicopter move correctly, but on TM1100 the led stay off after binding.
I have activated telemetry on my radio under dsmx protocol, and after i have add 2 boxes on my radio , one for having Vbatt and the other for T°, but nothing on my screen , the values stay at 0....

What is the problem ? What i have made bad ?
This work for someone her ?

Thanks for your help

If i bind with telemetry on it seems to not answer correctly, there are strange movements.
I will try to bind with 8 channels. I'm actually with 7 channels.
How much channels max i can try ?

What change if i declare more 7 channels ? Each kind of telemetry is considered as a channel ?

I have made many tests with 12, 11, 10 and 9 channels, and and it works now but only when binding with 9 channels.
So, my problem is solved, thank you very much for your help.

It is possible to "calibrate" voltage ?
Because i have 23.3v on a lipo 6S, but the TM1100 read only 22.95v...
So i would like to make it more precise. Maybe some modifications to do as a factor error to set in my devo 12S ?
Thanks for your help