Multi Drop Bus communication problem!!!

I am trying to communicate with coin changer cc6100 using Arduino Mega.
I used this mode to activate 9 bit -> Mods to HardwareSerial to handle 9-bit data - Libraries - Arduino Forum
I used sample code from this website(first code) -> Some tests for an MDB project · GitHub

And wired up everything using this schematic -> http://www.bildites.lv/images/9yclpeukug2mfs6lxsx.png
I connected GND together. But MDB_wakeup pin I left in air.
Here is connecter -> http://www.bildites.lv/images/iys34f76u6wbpt6lot61.png

But CC6100 won't response to RESET command and Arduino program stops because it waits for response from MDB slave. Where is problem, i have tried to get respone for two weeks.
I tried this tutorial too, but whitout luck -> http://blog.bouni.de/blog/2014/10/07/sending-and-receiving-9-bit-frames-with-arduino/
Please help me! (English is not my native language, sorry for mistakes)