The passenger elevator control system is a special intelligent serial communication control system that absorbed the advanced technology from India, Japan, and Germany, innovated and developed independently. The system applies bus technology to elevator control perfectly with safe, accurate, and quick performance. Every action of the elevator will be under the strict control of the microcomputer processor distributed in every part of the elevator. A strong network self-diagnostic function and watchdog system guarantee high efficiency and reliability of the system. Sound interface makes commissioning and modification more convenient, which can meet the requirements of buildings and passengers very well.