Access Control 20
Access Control 20 : Physical security: (6) Access control system topologies: Access control System Using Serial Controllers: (4) Serial Controllers With Terminal Servers: Disadvantages: (a) Increases complexity of the system. (b) Creates additional work for installers: usually terminal servers have to be configured independently, not through the interface of the access control software. Serial communication link between the controller and the terminal server acts as a bottleneck: even though the data between the host PC and the terminal server travels at the 10/100/1000Mbit/s network speed it then slows down to the serial speed of 112. 5 kbit/s or less. There are also additional delays introduced in the process of conversion between serial and network data. All RS-485-related advantages and disadvantages also apply
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