S100 series passenger elevator to introduce internationally advanced VVVF AC transformer, frequency conversion technology, safe, reliable, stable, comfortable, easy to operate computer control is widely used in hotels, restaurants, shopping malls, office buildings, commercial and residential. In order to ensure a high level of stability and reliability of elevator run, using digital control technology, serial communications, is the elevator control achieve precise, energy-saving, rapid, and to improve the lift performance. By reducing a large number of connections and contacts, thus greatly improving the reliability of lift.