Access Control 11
Access Control 11 : Physical security: (6) Access control system topologies: Access control System Using Serial Controllers: (1) Serial Controllers: Controllers are connected to a host PC via a serial RS-485 communication line (or via 20mA current loop in some older systems). External RS-232/485 converters or internal RS-485 cards have to be installed as standard PCs do not have RS-485 communication ports
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