Access Control 12
Access Control 12 : Physical security: (6) Access control system topologies: Access control System Using Serial Controllers: (1) Serial Controllers: Advantages: (a) RS-485 standard allows long cable runs, up to 4000 feet (1200 m); (b) Relatively short response time. The maximum number of devices on an RS-485 line is limited to 32, which means that the host can frequently request status updates from each device and display events almost in real time. (c) High reliability and security as the communication line is not shared with any other systems
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