Nmea 0183 Serial Adaptor Problem

[Giulio78]

I have:
Raspberry 2
Open Plotter 0.6.0
2 wifi Dongle
1 DVB/T Dongle
1 Hub 7 port
1 Nmea 0183 adaptor connected with Raymarine C90W (C90W Nmea Output with R+ and R- on the serial adaptor)
OpenPlotter The Inspector wrote: Connected with localhost:10110.Error:timed out, waiting for data.
The serial adaptor have green led (switch light green and dark green) but openplotter cant' received any data.
In openplotter i have:
system_input UDP 127.0.0.1 10110 none nothing
nmea SERIAL /dev/ttyUSB0  4800 none nothing
system_output TCP localhost 10110 none nothing
Could you help me?
Sorry for my english
Best Regards
Giulio