Weird Answer message from Venus GPS Logger

Just started playing with the Venus GPS Logger and

on the first message I send upon power up (a Configure Serial Port msg)

I get a weird answer :

Message Sent : A0 A1 0 4 5 0 1 0 4 D A

Answer : A0 A1 0 2 83 0 83 D A

Which means an ACK for msg Id 0x00 ?

Configure serial has an Id of 0x05, so am confused …

anyone seen this before ?