What is the design principle of access control system?
Access control system and computer communication can be divided into the following two categories: 1. Stand-alone control type of such products are the most common, with a small system or installation location of the unit. Usually using RS485 communication. Its advantages are small investment, communication line dedicated. The disadvantage is that once installed can not easily replace the management center location, difficult to achieve network control and remote control.
Weak access control system according to the design principles can be divided into the following two categories: 1. Controller comes with a reader (recognizer) This design flaw is that the controller must be installed outside the door, so part of the control line must be exposed, Insiders do not need a card or password to open the door easily. 2. Controller and card reader (identification device) split such system controller installed in the room, only the reader input line exposed to the outside, all other control lines are indoors, and the card reader is the number of transmission Signal, so if no valid card or password anyone can not enter the door. Such systems should be the first choice for users
2. Network-type products such as high technological content, is still rare, only a few companies shape the product. Its communication is used in the network commonly used TCP / IP protocol. The advantage of this type of system is that the controller and the management center are passing data through the LAN, the management center location can be changed at any time, without re-wiring, it is easy to achieve network control or remote control. Applicable to large systems or installations where decentralized units are used. The disadvantage of this type of system is that the stability of the communication part of the system depends on the stability of the LAN.
