Hello Yaasan,
Originally Posted by: Yaasan 
As you know, the mfx feedback signal doesn't mean S88 signal, right?
No, the S88 bus is a serial shift register with a parallel load input. It is much easier and cheaper to route this information from the decoders to the controller via cable.
I was talking about the engine decoder feedback, providing informations such as engine name, decoder uid, etc...
Originally Posted by: Yaasan 
I think mfx is not suitable with big layouts. DCC or MM2 is better than mfx for this issue. Of course, wireless system as Bluetooth and WiFi seems the best solution for big layout. The mfx is good solution but doesn't cover all use cases.
I personally believe that mfx is a modern an advanced protocol. MM and MM2 were easy and sturdy, but the modern requirements outdate them.
DCC (like MM and MM2) don't have decoder feedback. That was added later by Lenz with the RailCOM protocol. In my opinion, they just realized that DCC was ageing and copied some feature from the new marklin MFX.
If you don't need the feedback, MM2 and DCC are limited only by the number of addressable devices, and are easier to provide in big layout (wide number of available boosters, cheap to DIY).
Originally Posted by: Yaasan 
By the way, I'm developing
some hardware INSTEAD OF 60113 and MS2. Desktop Station software supports these my original hardware. I have a plan to support big layout booster board.
Interesting, but doesn't support MFX.
The idea behind MFX is quite genial, the engine decoder modulate the absorbed current with RDS code. In the "ugly box" 60113, beside a uC to interface the CAN bus signals with the rail signals, and a power booster, there is a SAA6579T that perform the demodulation task. A guy in germany developed his own ugly box, that seems to allow external boosters out of the box. But I can't understand enough german.
Anyway here is the link of the page
http://stummiforum.de/viewtopic.php?t=90373&p=974073and the pdf with the schematics.
http://stummiforum.de/download/file.php?id=4938With the help of google translator, I was able to understand something from this german forum. They mention something about boosters, the signal coming from 60113 would just be used to drive the DIY boosters (I think to prevent some disturbance with MFX feedback). And they mention that original boosters just act like a 60113, translating CAN bus to rail signal, and the MS2 is not able to control multiple boxes (ugly box + boosters?)
Originally Posted by: Yaasan 
Seems interesting, but the datasheet is only in japanese and I can't understand it.
Originally Posted by: Yaasan 
I don't have a solution to control the big layout using several marklin's 60113s. 60113 aims to control small layout. It is hard work to link between them. I think 60113 is not cheap if you bought many them.
One is ok, many are expensive. That's why it would be nice to have DIY boosters. If the informations about booster feedback I found last time is good and working, I believe it would not be difficult to make DIY boosters for less than 50$
Best regards
Paolo