Multiecuscan

hello friends today I installed cantiecar on win 7.ho before I had done diagnosis of fiat 500 2008,Fiat Panda 2009 and it went well, while I was diagnosed, I tried to start the engine but since the battery was the nmotor and went under load an excessive current draw and not 'avviato.ho detached cantiecar and I went to make a diagnosis of fiat panda, I tried to connect and enter the diagnosis but without success I always comes out the message (connect failed disconnected check your serial cable and port setting) I went into setting / interfacial / search interfaces) and notes that the cantiecar and connected to COM5 port correttamente.ho tried many times but without a good result, someone can help me?