I'm having problems getting my laptop to communicate with my cars ecu
i own a 2000(w) fiat punto hgt.
I go through the usual connection procedure, then using easy obd2, i get pc com port 4 okay but when its checking hardware interface, i get the error message "Interface communication failure - check connections and power"

i tried also using digi moto 4.03 and proscan v2.0

with proscan it just repeatedly flashes Tx Rx on the elm interface, which i'm connecting by a usb to serial adaptor.

any help apreciated
i have sucessfully used the DEC Superscan diagnostic equipment on this car, but i can't be spending that sort of money