| 摘要 |
A modular access control unit (47) for secured premises is provided with sensors (11, 13, 15, 17) and actuators (18, 19) coupled to analog to digital (21, 25) and digital to analog (27) conversion devices, communicating with an internal bus structure (29) connected to a CPU (31) and an electronic memory (33, 35). The unit (47) is self contained and communicates with other units and with manned workstations via either an LAN (39) or phone lines with modems (37). A security system utilizing the access control units may have several units and several workstations, as needed, and may also utilize a file server. |
