As we all know, among the numerous subsystems in the field of security, access control systems integrating functions such as identification, alarm monitoring, and output control not only have high technical content, but also serve as key modules for the interconnection of multiple subsystems, and the performance of integrated security systems. Play a decisive role. Therefore, it is no exaggeration to say that the quality of the access control system determines the overall performance of the security integrated system.
There are many types of access control systems, of which only the real-time online access control system can truly serve as the core carrier of the security integrated system. In addition to the basic functions of access control, the access control subsystem in an outstanding security integration system should also meet the following requirements:
1. Real-time and certainty: As a security integrated system, alarm monitoring is generally an essential function. For the alarm system, real-time performance is the basic guarantee for the system to obtain alarm information in the shortest time; determinism means that every event must be reported accurately and accurately. It is the most basic requirement of the alarm system. In many security integrated systems, the access control system also undertakes the task of alarm monitoring. Because the data exchange frequency and the exchange volume in the access control system are larger than the alarm system, the main control computer generally uses a polling method to obtain data from the access controller. The polling method can guarantee the stability of the communication and the certainty of the event; however, if the number of controllers in the system is large, the polling method cannot guarantee the real-time performance of the system.
To solve this problem, some manufacturers have introduced access controllers with dual buses. The second bus on the access controller adopts an active reporting method to ensure the real-time upload of alarm information. In order to prevent data collisions from causing communication blocking, collision detection and delay retransmission are used in information processing to ensure the certainty of events.
2. The input device should have good compatibility: "One Card" is often the basic requirement of the integrated security system, which requires that the access controller must be compatible with all kinds of identification devices popular on the current market to meet the different types of customers. Applications and different levels of security requirements.
3. The output control should have high reliability and flexibility: the access control system faces a wide range of output control devices, and the output requirements for the access control system are also different. This requires the access controller to have various output modes that can be selected. In order to prevent the mutual interference between peripherals and the interference to the system equipment during the operation of the peripherals and ensure the reliability of the system, the output terminal of the access controller shall be provided with a protection device.
4. Flexibility and security of data exchange: In order to ensure the reliability of data exchange, each communication instruction should be verified; in order to ensure the security of the system, the communication data can be encrypted to prevent illegal data theft to ensure the control Uniqueness.
5. Intelligent alarm monitoring: The access controller with alarm monitoring function must be able to correctly determine the status of alarm probes such as normal, disconnected, and disconnected, and truly integrate with various general alarms.
6. Multi-functional professional software: In addition to the basic access control and alarm monitoring functions, the software should also make full use of the hardware resources of the access control system to realize basic or extended functions such as patrol management, parking management, elevator control, etc.; Should be able to achieve the integration of other subsystems in the security integration system, such as providing OPC services, database import and export, global anti-submarine anti-submarine and cardholder positioning, multi-workstation work mode and other functions. In order to facilitate system management, other functions such as system certification, alarm information display with electronic maps, and cardholder photo display should also be integrated into the software.
There are many types of access control systems, of which only the real-time online access control system can truly serve as the core carrier of the security integrated system. In addition to the basic functions of access control, the access control subsystem in an outstanding security integration system should also meet the following requirements:
1. Real-time and certainty: As a security integrated system, alarm monitoring is generally an essential function. For the alarm system, real-time performance is the basic guarantee for the system to obtain alarm information in the shortest time; determinism means that every event must be reported accurately and accurately. It is the most basic requirement of the alarm system. In many security integrated systems, the access control system also undertakes the task of alarm monitoring. Because the data exchange frequency and the exchange volume in the access control system are larger than the alarm system, the main control computer generally uses a polling method to obtain data from the access controller. The polling method can guarantee the stability of the communication and the certainty of the event; however, if the number of controllers in the system is large, the polling method cannot guarantee the real-time performance of the system.
To solve this problem, some manufacturers have introduced access controllers with dual buses. The second bus on the access controller adopts an active reporting method to ensure the real-time upload of alarm information. In order to prevent data collisions from causing communication blocking, collision detection and delay retransmission are used in information processing to ensure the certainty of events.
2. The input device should have good compatibility: "One Card" is often the basic requirement of the integrated security system, which requires that the access controller must be compatible with all kinds of identification devices popular on the current market to meet the different types of customers. Applications and different levels of security requirements.
3. The output control should have high reliability and flexibility: the access control system faces a wide range of output control devices, and the output requirements for the access control system are also different. This requires the access controller to have various output modes that can be selected. In order to prevent the mutual interference between peripherals and the interference to the system equipment during the operation of the peripherals and ensure the reliability of the system, the output terminal of the access controller shall be provided with a protection device.
4. Flexibility and security of data exchange: In order to ensure the reliability of data exchange, each communication instruction should be verified; in order to ensure the security of the system, the communication data can be encrypted to prevent illegal data theft to ensure the control Uniqueness.
5. Intelligent alarm monitoring: The access controller with alarm monitoring function must be able to correctly determine the status of alarm probes such as normal, disconnected, and disconnected, and truly integrate with various general alarms.
6. Multi-functional professional software: In addition to the basic access control and alarm monitoring functions, the software should also make full use of the hardware resources of the access control system to realize basic or extended functions such as patrol management, parking management, elevator control, etc.; Should be able to achieve the integration of other subsystems in the security integration system, such as providing OPC services, database import and export, global anti-submarine anti-submarine and cardholder positioning, multi-workstation work mode and other functions. In order to facilitate system management, other functions such as system certification, alarm information display with electronic maps, and cardholder photo display should also be integrated into the software.
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