I found out! My master esc was configured to just use PPM instead of both PPM+UART, and my slave was configured as UART.
Now I changed to PPM+UART and everything is Allright!! 
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I found out! My master esc was configured to just use PPM instead of both PPM+UART, and my slave was configured as UART.
Now I changed to PPM+UART and everything is Allright!!