I'm afraid that (in ePO 4) adding it as an exception will not prevent it from being scanned. The only way to prevent this is to turn off the scanning function in the RSD sensor policy. In ePO 4.5 you can - you can tell the sensor not to scan sytems marked as exceptions, as well as particular IPs or ranges.
Thanks for the reply. We'll have to make a choice re: To scan or not to scan I guess. It is only a minor issue for a very small number of users. Is there a recommendation to scan for device details or not? What are you doing? Do you scan for details or not?