网络接口单元（NIU）是控制计算机与通信网络进行交互的一种接口设备。
Network interface unit (NIU) is an interface device between the control computer and the communication network.
故障恢复方法，通信网络，网络单元，及通信接口模块。
Fault recovery method, communication network, network unit and communication interface module.
主控计算机与各lcu中的监控单元和保护单元通过CAN总线通信，LCU中的PLC通过RS - 485接口与主控计算机通信。
Host computer communicates with the monitor unit and the protection unit of LCUs through the CAN bus. PLC in LCU communicates with host computer through the RS-485 port.
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