Attiny2313 send data and it is correct data 
for test i only send one value. To check if attiny2313 send some data i used osciloscope.
The code works when arduino is connected to PC but if not than nothing happens 
attiny2313 is directly connected via wire and attiny2313 tx is connected to arduino uno rx(0 pin)
Why, when i connect to pc the serial works, but when i unplug usb, there no binking?