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