Abstract: With the development and research of elevator technology, high-efficiency, high-speed, and intelligently controlled elevators will undoubtedly provide high-quality services. Practice shows that elevator remote monitoring systems, as an important means for elevator companies to provide technical services and compete in the market, have moved from behind the scenes to the forefront. Therefore, it is essential to develop a remote elevator monitoring system that is both technologically advanced and cost-effective. This is also why remote monitoring technology will be a major research direction for elevator group control technology in the future. Introduction Elevators are high-tech mechatronic products. Currently, the technical level and product quality of domestically produced elevators have entered the world's advanced ranks. However, accidents such as people being trapped, pinched, bottoming out, and overshooting still occur frequently during elevator operation. The focus of elevator quality is reflected in operational reliability. Improving elevator operational reliability requires, on the one hand, improving design, manufacturing, and installation quality, and on the other hand, relying on a comprehensive maintenance system and advanced monitoring methods. I. Overview Remote monitoring systems for elevators are a key technological application in the field of elevator group control, but they are not widely used in every group control system. For example, data shows that approximately 99% of elevators in Hong Kong still use the traditional manual fault reporting mode. There are two main reasons for this: First, most developed remote monitoring systems are based on new elevator devices with microprocessors at their core. Applying these systems to existing older elevators requires significant technical modifications to achieve "new technology for old elevators." Second, remote monitoring systems are often expensive, and elevator owners are unwilling to install such costly devices in their existing systems. The rapid development of the property market urgently demands remote elevator monitoring. Because elevators are very busy modes of transportation, with up to 240 starts and stops per hour at peak times, and with numerous operating components (such as landing doors) and control buttons, coupled with the wide range of passenger skill levels, improving reliability relies heavily on maintenance and upkeep. Currently, the focus of international elevator technology advancements has shifted to after-sales service and property management. Elevator companies in the United States, Japan, and Europe have developed their own remote monitoring systems using modern communication and computer technologies. These systems place the elevators they are responsible for maintaining and repairing within a monitoring network. When an elevator malfunctions, the system can detect the problem immediately and instantly notify the monitoring center, while simultaneously dispatching dedicated maintenance personnel to resolve the issue. Because the system can store daily operational data and malfunction records, manufacturers and users have a comprehensive understanding of the operational status of a specific elevator over a period of time. Since the reform and opening up, my country's elevator inventory has grown rapidly, reaching 330,000 units. Ensuring the reliable operation of every elevator has become crucial for improving property management and advancing elevator technology in my country. Elevator remote monitoring technology has developed alongside computer control and network technologies. Currently, most major international elevator companies offer remote monitoring systems that complement their own systems and provide relatively complete functionality. However, due to China's unique national conditions, the practical application of these international companies' remote monitoring systems in China still faces certain limitations. If a system can only monitor its own elevators, it cannot monitor elevators belonging to other companies, and it also requires a high-quality telephone network. Furthermore, the monitoring system is quite expensive, making it unaffordable for most users. II. Application of Elevator Remote Monitoring Systems in Intelligent Buildings Generally, intelligent buildings are considered to consist of three main parts: an environmental and energy management system, a transportation system, and a maintenance system. The environmental and energy management system includes: power lighting system, sanitation and air conditioning system, security management system, disaster prevention system, anti-theft system, data system, property management system, and metering system (the metering system includes: energy metering, rent management, operational data compilation and analysis, system anomaly diagnosis, energy-saving diagnosis, and alarm information recording compilation); the transportation system includes: elevator group management, escalator management, automatic parking management, automated guided vehicle (AGV) management, and automatic metering instrument information recording compilation; the maintenance system includes: machine maintenance schedule management, machine degradation diagnosis, fault prediction diagnosis, data generation, automatic cleaning machine management, and equipment upgrade plan management. The essence of an intelligent building lies in the close integration of requirements, application functions, and various system-related elements on an information technology system platform to achieve intelligent and overall goals. This manifests as follows: the information parameters within the building are in an observable and controllable state; the building can quickly respond to various user needs, determining the most effective way to provide users with a convenient, comfortable, and creative environment. The development of computer and communication technologies enables rapid information transmission within the building, thus achieving building intelligence. Elevators must first be networked with all automated information systems within the intelligent building, such as fire protection, security, and building equipment control systems. This makes the elevator a safe, comfortable, efficient, and high-quality service tool. Serial communication, with its advantages of simple wiring and large information transmission capacity, is increasingly used in elevator control systems. It eliminates a large number of input and output circuits on the microcomputer interface board, reducing the amount of wiring in parallel tracks and machine rooms, greatly improving reliability. With the increasing intelligence of buildings, fieldbus technology is now being applied to elevator control systems and the building's BAS, FAS, and SAS. The system block diagram is shown below. From the perspective of intelligent elevator operation control, high-quality service is required. Advanced scheduling rules should be adopted in the control program to ensure optimal dispatching modes for group control management. Current group control algorithms no longer solely rely on "shortest passenger waiting time" as the objective, but instead employ fuzzy theory and neural networks. Genetic algorithms, an expert system approach, incorporate factors (i.e., expert knowledge) into the group control system. These factors include those influencing passenger psychology and evaluations of impending situations, representing a multi-objective control system combining expert systems and the current elevator operating status. Elevator voice announcements and information displays maximize the car's carrying capacity. Genetic algorithms prioritize passenger flow patterns and dispatch rules. Self-learning enables the elevator dispatch rules to evolve and adapt to environmental changes. III. Application of Elevator Remote Monitoring System This system, through leased lines and PSTN lines, significantly reduces system downtime. This is because elevator operating conditions can be adjusted without affecting passengers. The system receives data frequently, allowing for early problem identification and timely memorization. This system is a relatively successful remote monitoring system. Each elevator in the monitoring system is equipped with a remote monitoring unit (RMU) and a communication controller. The controller connects to the remote control center and equipment service terminal via PSTN and leased lines. The remote monitoring unit possesses various detection, monitoring, and diagnostic functions, capable of replacing most on-site inspection items, and its data can be internally recorded. This unit also has control functions, allowing it to request the RMU (Remote Management Unit) from the monitoring center. Data obtained from this unit can be used to generate optimized maintenance plans, serving as a basis for user consultation services. The communication controller exchanges data with the remote monitoring unit, controls internal communication between the elevator car and the remote monitoring center, and possesses modem and line control communication data rights with the monitoring center. The central monitoring host is a computer installed in the monitoring center; it is an independently owned control console, and the control room is a 24/7 manned control hall. Terminals are computers installed in the service equipment, providing on-duty personnel with elevator operation data recorded on the main computer. Terminals can check current elevator operating parameters and verify detailed instruction data; more importantly, they also have report generation functions, listing remote monitoring results and instructions for on-site engineers. Until November 1999, the remote monitoring system included the original first set of microprocessor-based systems for 14 elevator types, but it has since expanded to current products, with newer elevators having these functions inherently included; earlier-produced elevators can be improved accordingly. (I) RMS System Functionality: Tracking boundary conditions and failure zones provides more comprehensive and explicit data than on-site inspection. For the purposes of our research, boundary conditions are defined as conditions that lead to failure due to retrying operations within normal operating conditions. Mechanical wear and contamination can affect the accurate operation of relay contacts, resulting in occasional, recoverable logic errors. Early warning of these symptoms is beneficial for ensuring the normal operation of all equipment around the clock. Further detailed tracking of these conditions provides data for analyzing typical mechanical failures, predicting failures, and generating cost-effective maintenance plans. It combines routine maintenance with immediate intervention. Specifically, there are three types of functions: The first type is performed while the elevator is delivering passengers and is consistent with parameters typically checked by field engineers; the second type includes brake tests, door operation tests, and other complex process handling that can distinguish what is about to occur in these early stages. These are performed at scheduled times, typically late at night when there are fewer passengers; the third type is tests conducted by engineers under process monitoring. These tests revealed detailed diagnostics regarding controller conditions and the operating time consumption of the traction motor and hoistway machinery. The elevator maintenance and component replacement schedule is generated based on the number of elevator operating cycles, power standby time, and the number of times the machine door is opened on each floor. This information, combined with mechanical wear and failure rate data, significantly reduces elevator service disruptions, routine maintenance, and the replacement of components that occur simultaneously through planned monitoring. (II) Operational Statistics Consultation: Elevator operational statistics are crucial for building owners or managers because they show how people move through the building and how many people visit a particular floor. The importance of these statistics also lies in demonstrating the service goals the elevator system is achieving. (III) Customer Reports: Information obtained through the online monitoring system is delivered to customers in the form of monthly inspection reports and periodic operational data statistics. Monthly inspection reports are automatically generated and printed from the terminal, detailing various common, boundary, and fault conditions. Remote monitoring improves system usability while reducing maintenance costs. OTIS has also launched a similar monitoring system. (IV) Problems with RMS Systems in Practice Remote monitoring systems for elevators are a core technology application in the field of elevator group control, but they are not widely used in every group control system. For example, data shows that approximately 99% of elevators in Hong Kong still use the traditional manual fault reporting mode. There are two main reasons for this: First, most developed remote monitoring systems are based on new elevator devices with microprocessors at their core. Applying these systems to existing older elevators requires significant technical modifications to achieve "new technology for old elevators." Second, remote monitoring systems are often expensive, and elevator owners are unwilling to install such costly devices in their existing systems. IV. Conclusion With the development and research of elevator technology, efficient, high-speed, and intelligently controlled elevators will undoubtedly provide high-quality service. Practice shows that remote elevator monitoring systems, as an important means for elevator companies to provide technical services and compete in the market, have moved from behind the scenes to the forefront. Therefore, developing a remote elevator monitoring system that is both technologically advanced and cost-effective is essential, and this will be the main research direction for elevator group control technology in the coming years. References: 1. Mao Huaixin, Elevator and Escalator Technology Inspection, Xueyuan Press, 2001. 2. Zhu Changming, Elevator and Escalator, Shanghai Jiaotong University Press, 1995. 3. Mao Liuping, Microcomputer Principles and Interface Technology, Tsinghua University Press, 2002. 4. Yu Haisheng, Microcomputer Control Technology, Tsinghua University Press, 1998. 5. Tian Ruiting, Microcomputer Principles and Applications, China Science and Technology Press, 2000. 6. Tang Wuzhong, Computer Network Experiment Tutorial, Baijia Press, 2002.