This is not a pic of mine, but an identical set up. It is a Porsche System Tester 2– the predecessor to the PIWIS.
I think the issue is not with power but with the cable or software. In simulation mode, when changing the dme map, the vin should auto populate. With mine, it is not. It’s bizarre though, because the software will interact with the dme, I can turn on fans and get data from the vehicle.
Does anyone know what that error code (47), refers to?