Full-featured RLM Series Modules can be switched remotely via contact closure by any control system that provides normally open, normally closed, maintained control, as well as with the local switch provided (factory default is normally open). Units provide contact closure status output, and include a local status LED. M Series Modules are always on and cannot be switched remotely unless used in conjunction with a RLM Series module and JMS Series master / slave jumper. Modules with remote control shall be controlled by the Middle Atlantic USC-6R controller, MPR-SEQA sequencer or by any control system that provides contact closure outputs (depending on module selected).