Access control device based on Ethernet communication protocol

The utility model aims to provide the access control device based on the Ethernet communication protocol, which has universality, adaptability, applicability and expansibility and can eliminate limitation bottlenecks of distance and quantity. The system comprises a switch, an upper computer and a plurality of MCU logic controllers, the MCU logic controllers are connected with signal contacts, the signal contacts comprise signal output ends and signal input ends, the signal output ends and the signal input ends are connected with external controlled objects, the adjacent MCU logic controllers are connected in series, and the signal output ends and the signal input ends are connected with the external controlled objects. And the MCU logic controller is in communication connection with the upper computer through the switch to form a tree-shaped architecture. The single-chip microcomputer control system is applied to the technical field of single-chip microcomputer control systems. 本实用新型旨在提供一种具有通用性、适应性、应用性、扩展性，能够