Access Control 15
Access Control 15 : Physical security: (6) Access control system topologies: Access control System Using Serial Controllers: (2) Serial Main and Sub-Controllers: Advantages: (a) Work load on the host PC is significantly reduced, because it only needs to communicate with a few main controllers. (b) The overall cost of the system is lower, as sub-controllers are usually simple and inexpensive devices. (c) All other advantages listed in the first paragraph apply
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