As said above, the Entec and the dongle serve the same purpose so either one SHOULD work, you don't need both. IIRC, the Entec PRO can identify itself and the Lynks dongle does not do that so if the S3 Entec driver sends the identify command during its initialization process and requires a response, it would fail with the Lynks dongle. I don't know if S3 makes that request or not.