The cable to connect to your PDA?
Depends on your PDA. On my iPAQ 2210 I use a normal serial Skpang ODBII/vag-com cable, a null modem adaptor and an iPAQ 2210 serial sync lead.
I've just got a XDA mini-s, and I haven't figured it out yet - I might have to buy a bluetooth-serial adaptor (£75 :yikes: )