1) The AWG will start outputting the signal immediately after the function has been called.
2) A null value (0) entered into the sweeps parameter will make the AWG output the signal continuously when the start and stop frequencies are different.
3) The signal out connector after the AWG has been turned off will return to a 0V state.
4) This is correct, the AWG and external trigger function independently of each other the the 220x series signal generator. If you require an AWG and external trigger you will have to look at the PS5000 series.
Crag Technologies, Inc