Remote terminal refers to the terminal equipment set up by the power system at the station end to collect and send real-time operating parameters of the power plant or substation, receive and execute control and regulation commands from the dispatch center. In terms of functionality, besides the "four remotes", event sequence recording has become one of the basic functions of remote control terminals. And develop towards functional diversification and intelligence. Remote terminal refers to the terminal equipment set up by the power system at the station end to collect and send real-time operating parameters of the power plant or substation, receive and execute control and regulation commands from the dispatch center. The main functions of the telecontrol terminal include: ① collecting and sending status information to the remote area (referred to as "remote signaling"); ② Collect and send digital, pulse, and analog signals to remote locations (referred to as "telemetry"); ③ Receive and execute remote dispatch control commands (referred to as "remote control"). ④ Receive and execute remote dispatch and regulation commands (referred to as "remote dispatch"). These four main functions are commonly referred to as the "Four Remote". In addition, the remote control terminal can also have the following optional functions according to operational requirements: data aggregation, information editing and forwarding, limit exceeding alarm, communication with two or more dispatch centers, event sequence recording, receiving and executing timing commands, receiving and executing signal reset commands, automatic switching between main and backup channels, etc. When equipped with a screen display and printer, it can serve as a means of human-machine communication and printing for tabulation. The remote terminal can also form a local monitoring system with a microcomputer to achieve local monitoring, tabulation, and event sequence recording