A communication system for controlling remote place using multi-level communication unit with redundancy

摘要

The present invention relates to a communication system for a remote control apparatus using a multi-level with redundancy communication unit. Serial communication for collecting data at the lower level, LAN communication for exchanging data at the upper level, and multi-communication unit linking the two communication methods are installed as relay devices, and lower serial communication is used for multi-communication. Any communication such as RS232c, RS485, Current loop, CAN (Controller Area Network) can be used inside the unit, and the upper LAN communication network can be used with both TCP and broadcast methods. The data format of the method is configured to include a data classification code and a separate check code for error checking to control communication. In addition, the multi-communication unit adopts a dual channel structure for both the upper communication and the lower communication, and one multi-communication unit divides two communication units having the same structure into a master and a slave.