Your hardpoints will never deploy in SC but you can access your D Scan if you assign it to the correct fire group and it will be accessible all the time I think, regardless of whether hardpoints are deployed or not (as it isn't a weapon and doesn't use a hardpoint).
So, for example under the first column in the fire groups tab (this will be firegroup 1) set your weapons to (1) and your D Scan to (2). All weapons assigned to (1) will fire on primary trigger and your D Scan will fire on your secondary trigger.