I have got 2 cables which I know has worked on another computerAs a question.. where did you get your comms cable for the EAS. if you cant verify the quality of the cable a duff connection will give you spurious signals and inconsistent readings and probably wont clear the faults allowing the EAS to function!
and a p38.
I have dug a bit deeper with the drivers in my computer..i have deleted and reinstalled the drivers plus there is a setting where you can adjust the comm port settings to help with connection problems so will have another look tomorrow.