We rarely get hands-on with DVRs as we're IP camera specialists, but for the NVRs SADP won't show cameras connected to the NVR.
Only the NVR would be listed in the table in SADP.
You should be able to browse to the DVR (using Internet Explorer), login, go to Config -> Camera Management and see the connected cameras.
iVMS-4200 should let you do similar.