Hi,
are the ATE ATH and ATL commands related to the data flow between the vehicle and the interface or between the PC and the interface ?
i.e. do they enable/disable echo, headers and linefeed on the data going to and from the vehicle to interface or to and from interface to PC ?

I guess if its between interface and PC then at the high speeds available these days with the newer interfaces I guess it shouldn't make much difference whether these are on or off, right ?