Read fault code Audi 100 2.6 Bj 1992

Hello, can someone tell me if the Audi 100 2.6 BJ1992 has only a flash code or already a correct diagnostic function (OBD2). If it has only a flash code and is not a fault control light in the control panel, how can I read out the flash code myself? I tried it today with the OBDTool plug incl. 2×2 adapter and laptop with VAC COM 409-1 and also 311-2, connected the cables, then switched on ignition, then started the VAG Com, via options that includes Com Interface selected (he also found, also the diagnostic interface) then I went on auto-scan, selected my vehicle and then started. After some time the VAG-Com brings the message that the Baud rate cannot be synchronized. Do I do something wrong? Or is that not possible with the vehicle? Thank you for your help! Ralf