The Motorola Device Manager application is primarily used to update the firmware on the supported devices. I've attached a Motorola phone to my PC and launched MDM, but it only checked the firmware version and nothing else which means you need to use another procedure to transfer the contacts from mobile to PC.
Most of the Android devices have a possibility of exporting contacts from its interface. Locate the Contacts icon, then press on Settings > Export. Select the contacts you want to export and confirm the procedure. The file will most likely be saved in the root of your internal storage.
The file will be in VCF or CSV format. VCF will be opened by Windows, while CSV is more versatile and can be loaded into Excel.