Patent ID: 6157952
Filing Date: 2000-12-05
Classification: H04L

Abstract:
An access control device controller comprising:communicating means for communicating data over a network, said communicating means including a first line and a second line, said communicating means requiring each access control device controller on said network to have a unique address;address setting means for setting a unique address on the access control device controller, said means including(a) a visually perceivable digital readout mounted to the access control device controller for displaying a digital readout indicating a current address of the access control device controller; and(b) a switch for causing said current address of the access control device controller to change, said switch capable of setting a selected address indicating that the access control device controller is a master controller;a first means responsive to the access control device being a master controller for activating a circuit to connect an end of line termination resistor across said first line and said second line at the master controller; anda second means responsive to the access control device being a master controller for activating a circuit to connect a first power supply level through a first resistor to said first line and a second power supply level, different from said first power supply level, through a second resistor to said second line at the master controller.