How to Select and Use Your Command Control System Fiehmann. This comprehensive volume will help you get the most out of your Digital Command Control (DCC) system! Diagrams and photographs show you how DCC works, from wiring and installation to decoder settings and throttle units. You even get information on various product lines to help you select the right system for your plans. 80 pages, 80 color photographs and 55 illustrations, 8¼"x 10¾", softcover. #0R04183