For split-type access control, the number of gates controlled by split-type access controllers currently on the market is mainly single-door, double-door, and four-door, and some manufacturers have even introduced eight- and thirty-two-door controllers to face many types. In practical engineering applications, how do you choose?
The selection of multi-gate controllers should be based on the specific conditions of the project. In general, comprehensive consideration should be given to the installation location of the controllers in the project, the distance between doors and doors, the number of door points, and the project's capital budget.
In some small access control system projects, the construction unit does not have a clear requirement for the installation of the equipment. The general controller can be directly installed in the ceiling of the door point. With this installation method, the project provider or user selects the multi-gate controller. It is necessary to consider the distance between multiple doors managed by the same controller, and whether the wiring of each door point to the controller is convenient or not. At present, most communication systems between access control systems and controllers use Wiegand protocol. In theory, Wiegand signals have a maximum transmission distance of 150 meters. However, in practical engineering applications, the transmission distance is affected by many factors. It is recommended that readers be used to controllers. The distance is within 60 meters. Therefore, if the distance between two doors exceeds 100 meters, consider using a single door controller for each door as much as possible instead of using a two-door controller to manage two doors. Similarly, when selecting a four-door controller, Also consider whether the distance from the four door points to the controller meets the requirements.
Some projects require the access controllers to be centrally installed in weak electric wells or machine rooms. When the controllers are installed in a centralized manner, the front-end equipment lines of each door point are connected to the weak electric well or the equipment room, and the input and output interfaces on the controller are uniformly allocated. Under the circumstances, the project can select more door controllers, such as selecting all four door controllers, which can reduce the total number of controllers to save space required for installation, and in principle, the overall success rate of multi-gate controllers is slightly lower.
Of course, the number of gates that the access controller does not manage is as good as possible. There are also drawbacks in the use of multi-gate controllers. A controller is broken and affects the management of multiple doors. At present, the common practice of most of the eight or more access controllers in the market is that the main controller does not directly drive the front-end equipment, but connects the input/output equipment of each door point through the pre-driver unit module. This way of increasing the number of controller management gates through the sub-control structure increases the complexity of the system. We know that, in general, the system failure rate will increase as the complexity of the system increases.
Therefore, although the controller that chooses more doors has a cost advantage in the one-time investment of the project, it does not disparate the follow-up maintenance and other issues. For the balance between cost control and practicality, if the project requires the use of multi-gate controllers, 2- or 4-door controllers are a better choice. Unless there are special requirements, try to avoid selecting access controllers with more than 8 doors.
In addition, it should be noted that some customers use two card readers and receive a single-door controller for cost-saving access to the two-way control of the credit card. After the system is put into use, it is found that the management requirements of the access control record are not met. In fact, most projects require two-way card entry and exit records to be separated. This requires the use of a two-door controller to manage one door, and the system must be able to support bi-directional door-point management functions that can automatically distinguish door-to-door or door-opening records. . Take Kesong ACM68 series access controller as an example, the two-door controller can manage two doors for one-way card swiping, or set up to manage one door in bi-directional control mode; the four-door controller can manage four doors for one-way swiping, or After the two-way control mode is set to manage two doors and the host computer software is set to the bi-directional control mode, the type of the door entrance or exit event of the user can be distinguished.
Based on the above analysis, the selection of the access controller needs to integrate various factors. When the project provider or user purchases the access control system, he or she can provide more detailed project descriptions. The access control manufacturer can make targeted access control system solutions and Configuration.
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