The 4M2 is a line of programmable microprocessor based controllers designed for the North American residential elevator market. This reliable controller fulfills all A17.1 requirements and is ETL listed for residential elevators. The 4M2 can operate in either single automatic or constant pressure modes and accommodates 2-4 stops, short floors, two speeds in both directions, two way re-leveling, retiring cam, fixed cam or four electric locks, two automatic gate operators, four swing door operators, emergency lowering and an emergency light output. It can be used with hatch switches or a magnetic landing system such as our SEL2. All relays that operate external devices are socket mounted to allow easy field replacement. The 4M2 incorporates a twenty event log to track system events. The system also tracks the number of runs and re-levels. Both the log and counters require a password before they can be cleared. The entire line of controllers is housed in a 20 x 20 x 6 ¾ inch cabinet