Can I connect a MS-DAB100A or a SiriusXM module to my MS-RA205, when I am using a MS-BT200?

Unfortunately not, as the MS-DAB100A, SiriusXM module and MS-BT200 use the same port on the rear of the MS-RA205 stereo. To be able to have DAB/SiriusXM functionality as well as Bluetooth, you will need to purchase a MS-BT100 and connect this to the stereo via the AUX input (Loom B)