Autel Geniscan gs400

[HawkDubber]

G'day, I purchased the aforementioned hand held scanner to check for problems the car may have. It gets power from my OBD2 port but has a problem communicating with the ecu, giving a link error message.

I have checked the scanner on my wifes car and it works. How can i check the port is functioning properly ?

1996 VW Golf Mk3

Cheers.