Thank you so much people for your answers!
I finally connected my instrument with a GPIB cable to my pc.I m trying now to figure out if they can communicate.So I placed in my block,a ''GPIB write''.
In "address string" I put the address of the instrument.In "data" I put START (manual pg.121).Shouldn't I see something in the instrument so I can see if there is any communication cause nothing happens.Is wrong something with my data?